Since 1993, “A’WeighWe Go,” a proj-ect of the Recreational Vehicle SafetyEducation Foundation (RVSEF), hasweighed over 27,000 motor homes andtrailers in conjunction with RV events.

The results are not pretty. Of theRVs checked by RVSEF, nearly a thirdhad loads that exceeded the capacity of thetires on the vehicles.

Most of the weight was on the rear.Twenty-two percent of allrear tires were overloaded. And weight distribution was so poor that about 28 percent of all motor homes wereout of balance by 400 pounds or morefrom one axle end to the other.

In a separate survey conducted by Bridgestone/Firestone, 4 out of 5RVs had at least one underinflated tire,a third of which were dangerouslyunderinflated, and at risk of failure.

An underinflated tire cannot carrythe load of a properly inflated tire.When a tire is underinflated, the extraweight causes greater heat build-up inthe tire, which can lead to tire failure.

Often, these dangerously under-inflatedtires were the inner tires of dual pairs,tires that are difficult to see and difficult to service.

For your safety and that of your passengers, never exceed your vehicle’s safe load capacity,and always make sure your vehicle’s load is properly distributed.

Negative effects ON SAFETY

■ Tire failures■ Reduced handling capability■ Dangerous on-road breakdowns■ Stopping distances may lengthen

Negative effects ON YOUR POCKETBOOK

■ Rapid tire wear■ Irregular tire wear■ Rapid component wear■ Excessive fuel consumption■ Costly breakdowns

Overweight Vehicles & Underinflated Tires: A GROWING PROBLEM

How overweight ARE our vehicles?

Overloading an RV, mini-bus, light truck, van or ambulance, or running on underinflated tires, is not just hard on the vehicle– it could cause your tires to fail. Tires and axles are designed to handle only so much weight. Exceeding it puts a strain

on the whole system. Overloading and underinflation are both unsafe, send operating and repair costs sky-high and can cause unexpected downtime. Don’t let an overweight vehicle or underinflated tire spoil your trip – or worse.

Neglect makes matters worse

Even a tire that’s in perfectly good condition,properly mounted and correctly inflated can losebetween 1 and 2 lbs. of inflation pressure (psi) permonth, depending on tire size. (This is normal. Seethe story on page 9.)

In just six months,inflation pressureloss could be asmuch as 12 psi,a potentially very serious situation that couldcause a sudden tire failure that could lead to accidents or death.

According to RVSEF,

33% of RV’s had overloaded tires

22% of rear axles were

overloaded

It is essential to weigh each axle end of your vehicle to determine whether it is overloaded,and whether the load is correctly distributed,

front to back and side to side.ALL ABOARD!The most critical point about weighing a vehicle is that it must be weighedwith everything on board that will bethere while you’re traveling.

That means you must weigh thevehicle with passengers, supplies, food,

water, fuel, oil, towed items, bicycles,clothing, propane, etc. Bear in mindthat water, fuel and propane can easilyexceed 750 lbs. You must know theactual load on the axles and wheels, and there’s no other way to do it.

AXLE END BY AXLE ENDIn addition to knowing the total weighton the ground, it is crucial to know

the weight on each end of each axle.That’s the only way you can find out if the load is both within the capacity of the axles, wheels and tires, as well as whether or not the load is properly distributed.

Too Much StuffMany vehicles, including RVs, mini-buses, trailers and ambulances end up overloaded simply because peopleput too many things into them. There isno easy way to determine the weightyou’ve loaded, so there’s a temptation tokeep loading until every available spaceis filled. People are loading by volume,but weight is far more important.

Unfortunately, you may haveexceeded the load-carrying capacity of the tires or axles long before every-

thing is on board. The only way to tellif a vehicle is overloaded is to have itweighed. (See below for more information.)

Load Out of BalanceAnd, it’s also possible to be within thevehicle’s Gross Vehicle Weight Rating(see page 4 for definitions of terms), yet stillhave overloaded axle ends or tires.

That comes about, of course, if the load is not properly distributed.Again, balance is something very difficult to determine when you’re loading the vehicle. You could be

out of balance from front to rear orfrom side to side.

If uneven loading is serious enough,you could be within an axle or tire’scarrying capacity on one end of an axle,and over capacity on the other.

Unfortunately, this is even harderto discover, because some types of load-leveling systems compensate for out-of-balance loading, making it harder to see.Again, properly weighing the vehicle isthe only way to be sure.

How does overloading happen? Under-Spec’dAXLESor TIRESIncreasing capacity by changing axles isprobably too expensive and impracticalfor most RV owners.

With tires, you may have some flexibility. Tires are available in a varietyof load ratings and sizes, and if the tiresyou currently have cannot handle theload, it may be possible to replace yourtires with tires of higher capacity. Consultthe vehicle manufacturer before makingany change to your tires.

Bear in mind, though, that the ultimate capacity

of the vehicle is determined by

the weakest link in the system. If axles

are at or near the limit of their capacity,there’s no point putting on tires that canhandle higher loads.

How?

2

When you weigh your RV or travel trailer (including “fifth wheel” types),you must weigh it with everything on board including passengers.

Where?FINDING SCALESYou should be able to find certified scales by looking in your Yellow Pagesfor moving and storage companies,farm suppliers, gravel pits, recyclingcompanies or commercial truck stops.

Be sure to call in advance to determine whether the facility offers public weighing services, their hours of operation and any fees that might be involved.

You must not exceed the total Gross Vehicle Weight Rating (GVWR) for your vehicle,RV or travel trailer, AND you must not exceed the Gross Axle Weight Rating (GAWR)of each of your axles, nor the maximum load for your tires.

If your weight is higher than the GVWR, you’ll have to reduce the load byremoving some things.

If you have not exceeded the GVWR, but have exceeded the maximum permissible load on the axles or tires, you may be able to redistribute weight tobring all loads back to permissible levels.

Remember, running overloaded is both dangerous and illegal, besides puttingexcessive – and expensive – wear and tear on most vehicle components.

You can get this free brochure “How to Weigh Your Travel Trailer or RV,” providing

detailed instructions on weighing your RV or travel trailer, online, from many tire dealers, and by calling 1-800-847-3272.

Look for scales at moving and storage companies, farm suppliers, gravel pits,

recycling companies or truckstops.

What to do if your weights aren’t right

3

Once you’re thereBecause weighing your vehicle is acomplicated job, we’ve published aseparate booklet, “How to Weighyour Travel Trailer or RV,” that youcan use as a workbook for weighingand recording your results.

You can download a copy of the booklet from our web site, www.trucktires.com. Copies are

also available free of charge atFirestone MasterCare Tire Centers,and from many other authorized tire dealers nationwide. You can also obtain a copy by calling us, at 1-800-847-3272 or by e-mail to contact@trucktires.com, and asking for the free publication: How to Weigh Your Vehicle.

A Federal Dataplate is requiredby law on all vehicles. It lists theGross Vehicle Weight Rating(GVWR), the maximum weight

at which the vehicle may be operated.Note that this weight rating may belegally exceeded only when the vehicle is parked.

The Federal Dataplate also provides a Gross Axle Weight Rating(GAWR), the maximum weight that should ever be on a given axle.Because this rating is based on theactual characteristics of the vehiclecomponents, you should never exceed this rating, even when the vehicle is parked.

The GAWR, divided by two, is the maximum axle rating for eachend of the axle. You must not exceed this weight on either end of the axle,even if the total does not exceed the GAWR.

All members of the RecreationalVehicle Industry Association(RVIA) are required to place an additional label on the vehicles theymanufacture. It lists information notfound on the Federal Dataplate andsupersedes the Federal Dataplate,which usually covers only the basicvehicle chassis.

There are two versions of theRVIA label, depending on whether the vehicle was manufactured fromSeptember 1996 through August 2000,or after September 1, 2000.

There are also separate versions of the label for motor homes and fortrailers, including “fifth wheel” trailers.

LA

NG

UA

GE

COMMON TERMSGCWRGross Combined Weight RatingThe maximum allowable totalloaded weight rating of the RV andany vehicle it is towing. GCWRminus GVWR (see next definition)represents the allowable weight forthe towed vehicle.

GVWRGross Vehicle Weight RatingThe weight rating established by the chassis manufacturer as the maximum weight (including vehicle,cargo, liquids, passengers, etc.) the com-ponents of the chassis can support.

Tongue WeightThe downward weight exerted at the hitch or 5th wheel connection by a fully loaded towed vehicle.

GVWGross Vehicle WeightThe actual weight of a fully loadedvehicle (including vehicle, cargo, liquids/fuels, passengers, towed vehicle’s tongue weight, etc.). TheGVW must not exceed the GVWR.

GAWRGross Axle Weight Rating(for each axle) The maximum weightrating that the components (tires,rims/wheels, brakes, springs, axle) of each axle are designed to support.

GAWGross Axle WeightThe actual weight of a fully loadedvehicle that is carried by a single axle.

Vehicles manufactured by members of the Recreational Vehicle Industry Association use labels like these to provide additional information not found on the Federal Dataplate.

4

OF

LO

AD

SUVWUnloaded Vehicle WeightThe weight of the vehicle as builtat the factory with full fuel, engineoil and coolants, but without cargo,fresh water, LP gas, occupants ordealer-installed accessories.

NCCNet Carrying CapacityThe maximum weight of all occupants including the driver, plus personal belongings, food, fresh water, LP gas, tools, tongueweight of any towed vehicle, dealer-installed accessories, etc. that can be carried. (NCC is equal to or less than GVWR minus UVW.)

SCWRSleeping Capacity Weight RatingThe manufacturer’s designated number of sleeping positions multi-plied by 154 pounds (70 kilograms)for each. Note: If your passengersweigh more than 154 pounds each,the number of passengers may haveto be reduced to avoid exceedingSCWR.

CCCCargo Carrying CapacityThe GVWR minus all of the following: UVW, full fresh (drinking) water weight (includingheater), full LP gas weight, SCWR,tongue weight of any towed vehicle and weight of any dealer-installed accessories.

What inflationpressure to useNever set tire inflation pressuresBELOW the recommendations you findon the vehicle manufacturer’s placard.

Also, you must not exceed the maximum inflation pressure ratingsshown on tire sidewalls. Overinflatedtires are more likely to be cut, punc-tured or broken by sudden impact ifthey hit an obstacle, like a pothole, athigh speed. Correct inflation pressurecan help minimize that kind of damage.

The maximum inflationpressure (displayed on thetire’s sidewall) is also theminimum required to carrythe maximum load.

What is the capacity of your tires & wheels?

Wheel Load &Inflation RatingsBe sure you also know the load andinflation pressure ratings for yourwheels as well. Often, these arestamped on the inside of the wheels,but if not, your dealer can help youfind out what they are. Never exceedthe maximum load or inflation pressure rating of your wheels.

Wheels are often (but not always) stamped with the maximum loads and inflation pressures

that may be used with them. See your dealer for ratings if your wheels are not marked.

5

Tire Load RatingJust like axles, tires and wheels haveload ratings. The maximum ratings are molded into the side of the tires,and sometimes stamped on the insidesof wheels.

Bear in mind that these are max-imum ratings. The sidewall of the tireshows maximum load and minimuminflation pressure for that load.

If you use passenger tires (no “LT”in their size designation) on multipur-pose passenger vehicles, trucks, buses or trailers, you must reduce the loadrating of these tires by 10 percent.

Inflation pressures that are too high for the load can make tires more susceptible to impact breaks if they encounter obstacles at high speeds.

Speed RatingMany tires have speed ratings.

You’ll find this information on the tire sidewall. The speed rating

indicates the maximum speed at which the tire can be operated at the

correct load and inflation pressure.Never operate your vehicle at speedsthat exceed the maximum speed forthe lowest-rated tire on the vehicle.

Remember, in all cases,the lowest speed-rated tiredetermines the maximum

speed for the entire vehicle combination,

including any towing vehicle.

Care ON THE ROADWhen you’re traveling, do as professional commercial drivers do: inspect yourtires regularly and check and adjust cold inflation pressure every day that youactually travel. (See page12 for details on how to measure and adjust inflation pressure properly.)

If you need to “block” tires to level the vehicle, be sure that the block islarger than the “footprint” of the tire. No part of the tire should ever

“hang over” the edge of the block. This can cause internal damage to the tire.

Make sure that blocked tires do not overhang any part of the block.

Care ATHOMEFor best tire performance and life, the best thing you can do when you get homeis to take the load off your tires by putting the vehicle up on blocks.

Cover the tires with opaque material to keep sunlight away. Ozone in the air can deteriorate tires, especially sidewalls, and UV radiation from the sun canaccelerate this effect.

If you remove the tires from the vehicle, store them in a cool, dry, darkplace, away from grease, oil and fuel, and well away from electrical equipment(like motors or generators) that produce ozone.

Keep your stored tires inflated to a minimum pressure of 10-15 psi, andarranged side-by-side, like a row of donuts. Avoid letting tires sit on asphalt forlong periods of time because they can absorb damaging oils from it.

CLEANING tiresGenerally, you do no damage to yourtires by leaving them dirty.

Sidewall rubber contains antioxi-dants and antiozonants that are designedto gradually work their way to the sur-face of the rubber to protect it.

Washing tires excessively removesthese protective compounds, and cancause tires to age prematurely.

The same thing is true of most tire “dressings,” designed to make tireslook shiny. Most of these preparations remove protective compounds, againcausing tires to age abnormally.

Occasional washing with soap and water is OK, but anything beyondthat can actually shorten the life of your tires.

Washing tires too often can remove protective compounds and result in premature aging. Avoid harsh cleaning agents, steam cleaning and tire dressings. 6

1. Do not exceed maximum speeds allowed by law.

2. Always reduce your speed appropriately for traffic, weather, vehicle or road conditions.

3. Never exceed the maximum speed of “speed-rated” tires.

4. With “LT” (Light Truck) tires do not exceed legal speed limits.( If you use LT tires at speeds between 66 and 75 mph, increase cold inflation pressures by 10 psi above the recommended pressure for the load but do not exceed the maximum inflation pressure for wheel or tire. )

5. If you use medium commercial truck tires, do not exceed the “maximum sustained speed” rating for these tires as foundin the manufacturer’s databook.

Every tire sold in the U.S. is requiredto have a DOT (Department ofTransportation) identifying number.This is a 10- or 11-digit number thatcontains lots of information about thetire manufacturer, size, plant where itwas made, etc.

The last 3 or 4 digits are of mostinterest to you, because they can tellyou how old your tires are.

DOT numbers appear only on one sidewall of your tire. Older tires have 3-digit numbers, with the first two digits signifying theweek of the year and the third

digit the year when the tire was made.Tires made in the 1990s may also havea triangle alongside the numbers, signi-fying that they were made between1990 and 1999.

Newer tires have 4-digit numbers,where the first two digits signify theweek of the year and the latter two digits indicate the year.

What makes it a proper repair?

1. Punctures are filled and sealed with a “stem.”

2. Inside of tire has a reinforcedpatch covering the puncture.

3. Tire is fully inspected inside and out for hidden damage.

4. Repair is made according to tire manufacturer’s specifications.

5. Repair size does not exceed limits set by tire manufacturer.

6. Repair is in a permitted location.

How old are my tires?

Puncture Repair Area

How old isTOO OLD?

The last 3 or 4 digits of the DOT number on your tires tell you the week and year that the tire was manufactured.

DO NOT REPAIR TIRES YOURSELFPractically no RV owner we know is properly equipped or trained to repair tires.The equipment and supplies, not to mention the skills required,go way beyond everyday tire care knowledge.

Know the right answersIt is both incorrect and dangerous to attempt to repair a tire withoutremoving it from the wheel on which it is mounted.

You will sometimes see cheap“string” repair kits in auto parts storesand even in some conveniencestores. You may also be told that a“plug” repair can be done from theoutside of the tire, without removingit from the wheel.

Using these types of repairs isdangerous and can do permanentdamage to your tires, rendering themunusable. Improper repairs will alsoinvalidate any warranty on your tires.

7

This is a difficult question. It dependson use, care and conditions. For a variety of reasons, tires that get a lot of use may actually last longer thanthose that don’t. And, tires that havebeen properly inflated, stored, rotatedand inspected often will last longer thanthose that have not.

There’s no easy answer. RV users,for example, often put no more than afew thousand miles on their tires a year.Their tires may need to be replacedbecause of age long before their treads

are “worn out.” Is a 10-year-old tire tooold? Probably. Is a 6-year-old tire tooold? Maybe. Have your tires inspected.

The age of your tires, along withtheir overall wear, condition of side-walls, etc. are all factors your tire dealerwill take into consideration wheninspecting your tires and advising you on tire replacement.

For safety’s sake ask your dealer to destroy your old tires or render themunserviceable so no one else can use them.

19TH WEEK OF 1994

42ND WEEK OF 2002

Recognize a Proper RepairA correctly repaired tire will have both a plug or “stem” through any hole, and a reinforced patch on the inside. There are some combination units that are acceptable. A plug alone is not enough. A patch alone is not enough.

Repairs can only be made in the tread area, and only inside the area between the shoulder grooves as shown here.

Repairs can only bemade in the tread

and only in the areaof the belts.

Check the ratingsFirst, compare the actual axle endweight, which you determined byweighing the fully loaded vehicle, withthe maximum load allowed on the tiresyou have on the vehicle.

The actual permissible loaddepends on both the tire size and loadrange. The maximum load amount ismolded into the sidewall of the tire. It’s also shown in the load and inflationtables, alongside the letter indicatingthe load range of your tires.

On a Bridgestone or Firestone load and inflation table (which can befound in data books available at yourtire supplier) maximum loads are shown in boldface. For the tire size

225/70R19.5, as you can see from thechart, the maximum load for a singletire is 2,755 lbs. for a “D” load rangetire, 3,195 lbs. for an “E” load rangetire, 3,640 lbs. for an “F” load range tireand 3,970 lbs. for a “G” load range tire.

Using higher load range tiresFrom what we’ve just seen, it’s clearthat you could increase your loadcapacity by changing to a higher load-rated tire of the same size at a higherpressure. Bear in mind that you stillmust not exceed the gross axle weightrating shown on the vehicle placard,and you may not exceed the maximumtire inflation requirement for thewheels you are using.

Increasing pressuresAnd also notice that sometimes, youcan increase load capacity by increasingthe inflation pressure in your tires. Inour example, a single “F”-rated tire canbe used with a load of 3,315 lbs. at 85 psi, 3,450 lbs. at 90 psi and 3,640 lbs. at 95 psi.

Remember, these are minimumpressures for each of these loads. Inother words, you can increase yourinflation pressure above what the chart shows, so long as you don’texceed the maximum pressure specified for that tire.

Never operate your vehicle with tires inflated to

less pressure than required for the load. Never

operate your vehicle with tires inflated to

less pressure than specified on the vehicle placard,

NO MATTER WHAT THE LOAD.Never inflate your tires

above the maximum pressureshown on their sidewalls.

It’s not the tire, but the air inside it that supports the load.

That’s also why the right inflation pressuredepends on the load on each axle end. So,

as we said in the section on weighing, you first need to know the axle end loads for each axle. Then you can determine whether you have the right tires and the

correct inflation pressure for them.

What to Do After You Weigh Your VehicleREADING THE TABLES – Each tire manufacturer publishes load and inflation tables for its tires, and these are what you’ll use to find the correct inflation pressure.

8

TIRE SIZEDESIGNATION

450 480 520TIRE LOAD LIMITS (kg/lbs) AT VARIOUS COLD INFLATION PRESSURES (kPa/psi)

550 590 620 660 690 720 760

225/70R19.5

USAGE kPa65 70 75 80 85 90 95 100 105 110psi

1180(D) 1230 1300 1360(E) 1410 1470 1550(F) 1580 1640 1700(G)DUAL

kg2600(D) 2720 2860 3000(E) 3115 3245 3415(F) 3490 3615 3750(G)lbs.

114

1250(D) 1310 1380 1450(E) 1500 1570 1650(F) 1690 1740 1800(G)SINGLE kg2755(D) 2895 3040 3195(E) 3315 3450 3640(F) 3715 3845 3970(G)lbs.

116

119

121

123

125

126

128

What air doesSurprising as it might seem, it’s not the tires that support your vehicle. It’s the air inside them.

And that’s why it’s so critical that you keep the right inflation pressure in every tire all the time.

Protecting Your Most Important Assets

Same on both endsIt’s also important that you use the same inflation pressure on both

ends of each axle. If axle end loads differ enough that the tables specify different inflation pressures for each end, the axle is out of

balance enough that you should redistribute the load.If you can’t do that, you must inflate the tires on both ends to the

pressure required for the end with the heavier load.

The tires on both ends of an axle must be inflated to the same pressure. If loads dictate different pressures, the load is probablyimproperly distributed.

CHECK EVERY TIRE AT LEAST ONCE DURING EVERY TRAVEL WEEK!CHECK EVERY TIRE AT LEAST ONCE DURING EVERY TRAVEL WEEK!CHECK EVERY TIRE AT LEAST ONCE DURING EVERY TRAVEL WEEK!

Keeping air inside – where it belongsIt would be nice if you could just putthe right inflation pressure in your tiresand forget it. Unfortunately, that’swhat too many people try to do.

The trouble is, air doesn’t stayinside your tires. Those molecules areactive little guys, always looking for away out. And they find it too.

Depending on the size of the tire, you can lose1 to 2 psi per month as a result of diffusion of

air molecules through tire sidewalls.

Air can actually work its waythrough the sidewalls of your tires and escape. If you can imagine ping-pongballs bouncing their way through miles of a tangled briar patch, you’vegot the idea.

How much can you lose?Depending on size, a tire can lose 1 to2 pounds of inflation pressure (psi) permonth by diffusion through sidewalls.If you have a bad valve stem or faultyseal between the tire and wheel – or a nail in one of your tires – losses canoccur even faster.

That means up to 12 psi loss in just6 months if you never check and adjustinflation pressure. That’s enough lossfor many tires to be seriously – and dangerously – underinflated.

How often should you check?The absolute best practice you coulduse would be to check (and adjust, if necessary) every single tire, everysingle travel day.

Many tires used on RVs are commercial grade tires and commercialdrivers are required to check their tiresas part of their pre-trip checks. Ofcourse if you go somewhere and parkyour vehicle for a week, you wouldn’tneed to check every day during thattime – just the day you arrive and the day you leave.

That’s probably too much for most RV owners, so we suggest this:Make sure you check (and adjust, ifnecessary) the cold inflation pressurein every tire on your vehicle at leastonce during every travel week.

Altitude and outdoor temperaturesalso affect inflation pressures, anothergood reason to check them frequently.

What happens if you don’t?Running a tire underinflated is likerunning your engine without enoughoil or coolant. It may seem to work OKfor a while, but you are doing serious, permanent damage.

Adding oil or coolant won’t fix engine damage, and adding airwon’t fix tire damage. The tire is stillseriously damaged and can still fail,even after inflation is corrected.

If you find any tire 20 percent ormore underinflated, you should have itinspected (both inside and out) by yourtire dealer.

Is there an easier way?Checking inflation shouldn’t take thatlong to do, and it shouldn’t be thathard. On the gatefold pages at the back of this booklet, you’ll find sometips to make inflation checks easier and more effective. 9

2750 lb.65 psi needed

2975 lb.75 psi needed

5000 lb. = 2500 lb./ tire65 psi needed

5400 lb. = 2700 lb./ tire70 psi needed

[ if all tires 225/70R19.5 ]

10

Tire Load Limits at various Cold Inflation PressuresTIRE SIZE

USAGEkPa 480 520 550 590 620 660 690 720 760 790 830

DESIGNATION psi 70 75 80 85 90 95 100 105 110 115 120

kg 1480 1550 1610 1670 1750 (E) 127 1820 1890 1950 (F) 131 2010 2070 2120 (G) 134

9R22.5DUAL lbs. 3270 3410 3550 3690 3860 (E) 4005 4150 4300 (F) 4425 4550 4675 (G)

SINGLE kg 1530 1610 1690 1760 1850 (E) 129 1920 1990 2060 (G) 133 2120 2180 2240 (G) 136lbs. 3370 3560 3730 3890 4080 (E) 4235 4390 4540 (G) 4675 4810 4940 (G)

kg 1750 1830 1910 2000 (E) 132 2080 2160 2240 (F) 136 2300 2360 2430 (G) 139

10R22.5DUAL

lbs. 3860 4045 4230 4410 (E) 4585 4760 4940 (F) 5075 5210 5355 (G)

SINGLE kg 1850 1940 2030 2120 (E) 134 2200 2280 2360 (F) 138 2430 2500 2575 (G) 141lbs. 4080 4280 4480 4675 (E) 4850 5025 5205 (F) 5360 5515 5675 (G)

kg 1990 2080 2160 2250 2360 (F) 138 2460 2560 2650 (G) 142 2680 2710 2725 (H) 143

11R22.5DUAL lbs. 4380 4580 4760 4950 5205 (F) 5415 5625 5840 (G) 5895 5950 6005 (H)

SINGLE kg 2050 2160 2260 2370 2500 (F) 140 2600 2700 2800 (G) 144 2870 2940 3000 (H) 146lbs. 4530 4770 4990 5220 5510 (F) 5730 5950 6175 (G) 6320 6465 6610 (H)

kg 2110 2210 2300 2390 2500 (F) 140 2580 2660 2725 (G) 143 2820 2910 3000 (H) 146

11R24.5DUAL lbs. 4660 4870 5070 5260 5510 (F) 5675 5840 6005 (G) 6205 6405 6610 (H)

SINGLE kg 2190 2300 2410 2520 2650 (F) 142 2770 2890 3000 (G) 146 3080 3160 3250 (H) 149lbs. 4820 5070 5310 5550 5840 (F) 6095 6350 6610 (G) 6790 6970 7160 (H)

kg 2170 2260 2350 2440 2575 (F) 141 2630 2680 2726 (G) 143 2840 2960 3075 (H) 147

12R22.5DUAL lbs. 4780 4990 5190 5390 5675 (F) 5785 5895 6005 (G) 6265 6525 6780 (H)

SINGLE kg 2240 2360 2470 2580 2725 (F) 143 2820 2910 3000 (G) 146 3120 3240 3350 (H) 150lbs. 4940 5200 5450 5690 6005 (F) 6205 6405 6610 (G) 6870 7130 7390 (H)

Load & Inflation Tables for Tires Frequently Used on RVsREADING THE TABLES – Each tire manufacturer publishes load and inflation tables for its tires, and these are what you’ll use to find the correct inflation pressure.

11

Tire Load Limits kg/(lbs.) at various Cold Inflation Pressures (kPa/psi)Pressure Listed is in the Minimum for the Load

TIRE SIZE USAGE kPa 480 520 550 590 620 660 690 720 760 790 830 860DESIGNATION psi 70 75 80 85 90 95 100 105 110 115 120 125

kg 1120 1170 1215 (D) 115 1260 1310 1360 (E) 119 1410 1460 1500 (F) 122DUAL lbs. 2460 2570 2680 (D) 2785 2890 3000 (E) 3100 3200 3305 (F)8R19.5

SINGLE kg 1150 1220 1285 (D) 117 1340 1400 1450 (E) 121 1500 1550 1600 (F) 124lbs. 2540 2680 2835 (D) 2955 3075 3195 (E) 3305 3415 3525 (F)kg 1230 1300 1360 (E) 119 1410 1470 1550 (F) 123 1580 1640 1700 (G) 126DUAL lbs. 2720 2860 3000 (E) 3115 3245 3415 (F) 3490 3615 3750 (G)

225/70R19.5SINGLE kg 1310 1380 1450 (E) 121 1500 1570 1650 (F) 125 1690 1740 1800 (G) 128

lbs. 2895 3040 3195 (E) 3315 3450 3640 (F) 3715 3845 3970 (G)kg 1550 1590 1660 1750 (F) 128 1790 1850 2060 (G) 133

245/70R19.5 DUAL lbs. 3415 3515 3655 3860 (F) 3940 4075 4540 (G)

R250 ONLY SINGLE kg 1650 1700 1770 1850 (F) 129 1900 1970 2180 (G) 135lbs. 3640 3740 3890 4080 (F) 4190 4335 4805 (G)kg 1550 1590 1660 1750 (F) 127 1870 1990 2120 (G) 134

245/70R19.5 DUAL lbs. 3415 3515 3655 3860 (F) 4125 4390 4675 (G)

M724 ONLY SINGLE kg 1650 1700 1770 1850 (F) 129 1980 2110 2240 (G) 136lbs. 3640 3740 3890 4080 (F) 4370 4655 4940 (G)kg 1700 1780 1860 1950 2000 2170 2360 (G) 138

265/70R19.5 DUAL lbs. 3745 3925 4100 4300 4410 4785 5205 (G)

M729 ONLY SINGLE kg 1800 1900 1970 2060 2300 2340 2500 (G) 140lbs. 3970 4190 4345 4540 4850 5160 5510 (G)kg 1700 1780 1860 1950 2000 2000 2300 (G) 137

265/70R19.5 DUAL lbs. 3750 3930 4095 4300 4405 4415 5070 (G)kg 1800 1900 1970 2060 2130 2200 2430 (G) 139R250F ONLY SINGLE lbs. 3970 4180 4355 4540 4685 4850 5355 (G)

kg 1980 2000 2120 2150 2220 2300 (G) 137 2380 2570 2725 (H) 143DUAL lbs. 4365 4400 4675 4735 4900 5070 (G) 5255 5675 6005 (H)285/70R19.5

SINGLE kg 2110 2190 2300 2360 2440 2500 (G) 140 2600 2800 2900 (H) 145lbs. 4645 4835 5070 5205 5385 5510 (G) 5740 6175 6395 (H)kg 2060 2120 2200 2300 2370 2450 2575 (H) 141 2620 2725 2900 (J) 145

305/70R19.5DUAL lbs. 4540 4670 4860 5070 5230 5410 5675 (H) 5770 6005 6395 (J)

SINGLE kg 2240 2330 2420 2500 2610 2700 2800 (H) 144 2870 3000 3150 (J) 148lbs. 4940 5130 5340 5510 5745 5945 6175 (H) 6340 6610 6945 (J)kg 1800 1860 1940 2000 2020 2090 2120 (G) 134 2230 2300 (H) 137

255/70R22.5DUAL lbs. 3970 4110 4275 4410 4455 4610 4675 (G) 4915 5070 (H)

SINGLE kg 1900 1980 2060 2120 2220 2300 2360 (G) 138 2450 2500 (H) 140lbs. 4190 4370 4550 4675 4895 5065 5205 (G) 5400 5510 (H)kg 2080 2180 2290 2390 2490 2590 2690 2900 (H) 145275/70R22.5 DUAL lbs. 4590 4815 5040 5270 5490 5720 5940 6395 (H)

SINGLE kg 2230 2340 2450 2560 2670 2780 2890 3175 (H)R294 ONLYlbs. 4920 5160 5400 5645 5880 6130 6365 7000 (H)

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TIRE SIZE USAGEkPa 550 590 620 660 690 720 760 790 830 860 900

DESIGNATION psi 80 85 90 95 100 105 110 115 120 125 130

kg 2575 2650 2750 2900 2970 3070 3150 3270 3450 (J) 151 3560 3745 (L)315/80R22.5 DUAL lbs. 5675 5840 6070 6395 6545 6770 6940 7210 7610 (J) 7850 8255 (L)All Bridgestone

SINGLEkg 2800 2910 3030 3150 3260 3370 3450 3590 3750 (J) 154 3900 4080 (L)Tires Exceptlbs. 6175 6415 6670 6940 7190 7440 7610 7920 8270 (J) 8600 9000 (L)

R296

Tire Load Limits at various Cold Inflation Pressures

TIRE SIZE USAGE kPa 480 520 550 590 620 660 690 720 760 790 830 860DESIGNATION psi 70 75 80 85 90 95 100 105 110 115 120 125

kg 1430 1500 1600 1640 1710 1800 1840 1900 1950 (G) 131DUAL lbs. 3160 3315 3525 3615 3765 3970 4055 4195 4300 (G)245/75R22.5

SINGLE kg 1570 1650 1750 1800 1880 1950 2020 2090 2120 (G) 134lbs. 3470 3645 3860 3975 4140 4300 4455 4610 4675 (G)kg 1600 1680 1750 1830 1910 2000 2050 2130 2180 (G) 135DUAL lbs. 3523 3705 3860 4040 4205 4410 4525 4685 4805 (G)265/75R22.5

SINGLE kg 1760 1850 1950 2010 2100 2180 2260 2340 2360 (G) 138lbs. 3875 4070 4300 4440 4620 4805 4975 5150 5205 (G)kg 1860 1950 2060 2130 2220 2300 (F) 137 2390 2470 2575 (G) 141 2630 2725 (H) 143DUAL lbs. 4095 4300 4540 4690 4885 5070 (F) 5260 5440 5675 (G) 5795 6005 (H)295/75R22.5

SINGLE kg 2040 2140 2240 2340 2440 2500 (F) 140 2620 2710 2800 (G) 144 2890 3000 (H) 148lbs. 4500 4725 4940 5155 5370 5510 (F) 5780 5980 6175 (G) 6370 6610 (H)kg 2030 2130 2240 2320 2420 2500 (F) 140 2600 2690 2800 (G) 144 2870 3000 (H) 146

295/75R22.5 DUAL lbs. 4470 4690 4940 5120 5330 5510 (F) 5740 5940 6175 (G) 6330 6610 (H)R227 ONLY SINGLE kg 2230 2340 2430 2550 2660 2725 (F) 143 2860 2960 3075 (G) 147 3150 3250 (H) 149

lbs. 4915 5155 5355 5630 5860 6005 (F) 6305 6525 6780 (G) 6950 7160 (H)

kg 1870 1970 2060 2150 2240 2360 (F) 138 2410 2490 2575 (G) 141 2660 2800 (H) 144DUAL lbs. 4135 4340 4540 4740 4930 5205 (F) 5310 5495 5675 (G) 5860 6175 (H)285/75R24.5

SINGLE kg 2060 2160 2240 2360 2460 2575 (F) 141 2650 2740 2800 (G) 144 2920 3075 (H) 147lbs 4545 4770 4940 5210 5420 5675 (F) 5835 6040 6175 (G) 6440 6780 (H)

kg 2060 2130 2220 2300 (F) 137 2390 2470 2575 (G) 141 2770 2900 (H) 145DUAL lbs. 4540 4690 4885 5070 (F) 5260 5440 5675 (G) 6100 6395 (H)275/80R22.5

SINGLE kg 2240 2340 2440 2500 (F) 140 2620 2710 2800 (G) 144 3000 3150 (H) 148lbs. 4940 5155 5370 5510 (F) 5780 5980 6175 (G) 6615 6945 (H)kg 2180 2300 2420 2540 2660 2780 2900 3075 (H) 147DUAL lbs. 4810 5080 5340 5600 5860 6130 6390 6780 (H)

295/80R22.5SINGLE kg 2430 2560 2690 2820 2950 3090 3220 3350 (H) 150

lbs. 5350 5640 5930 6220 6510 6810 7100 7390 (H)kg 2360 2440 2540 2560 2730 2830 3000 3010 3150 (J) 148

305/75R22.5DUAL lbs. 5205 5375 5595 5840 6025 6235 6610 6640 6940 (J)

SINGLE kg 2575 2680 2790 2900 3000 3110 3250 3310 3450 (J) 151lbs. 5675 5905 6150 6395 6620 6850 7160 7300 7610 (J)

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Tire Load Limits at various Cold Inflation Pressures

TIRE SIZE USAGE kPa 250 300 350 400 450 500 550 660DESIGNATION psi 35 45 50 60 65 75 80 95

kg 630 720 800 (C) 100 870 975 (D)107

1030 1120 (E)112

1250 (F)116DUAL lbs. 1360 1625 1765 (C) 1985 2150 (D) 2320 2470 (E) 2755 (F)LT215/85R16

SINGLE kg 695 790 880 (C) 103 965 1060 (D)110

1130 1215 (E) 115 1360 (F)119

lbs. 1495 1785 1940 (C) 2180 2355 (D) 2550 2680 (E) 3000 (F)

kg 720 820 910 (C) 104 1000 1080 (D)111

1170 1260 (E)116

1400 (F)120DUAL lbs. 1545 1845 2006 (C) 2260 2381 (D) 2645 2778 (E) 3085 (F)LT235/85R16

SINGLE kg 790 900 1000 (C) 108 1100 1190 (D)114

1290 1380 (E)120

1550 (F)123

lbs. 1700 2030 2205 (C) 2485 2623 (D) 2905 3042 (E) 3415 (F)

kg 635 725 800 (C)100

885 975 (D)107

1040 1120 (E)112DUAL lbs. 1365 1630 1765 (C) 1995 2150 (D) 2330 2470 (E)LT225/75R16

SINGLE kg 700 795 880 (C)103

970 1060 (D)110

1140 1215 (E)115

lbs. 1500 1790 1940 (C) 2190 2335 (D) 2560 2680 (E)

kg 720 820 910 (C)104

1000 1080 (D)111

1170 1260 (E)116DUAL lbs. 1545 1845 2006 (C) 2255 2381 (D) 2640 2778 (E)LT245/75R16

SINGLE kg 790 900 1000 (C)108

1100 1190 (D)114

1290 1380 (E)120

lbs. 1700 2030 2205 (C) 2480 2623 (D) 2900 3042 (E)

kg 810 920 1030 (C)109

1130 1250 (D)116

1310 1400 (E)120DUAL lbs. 1740 2075 2270 (C) 2540 2755 (D) 2965 3085 (E)LT265/75R16

SINGLE kg 890 1010 1120 (C) 112 1240 1360 (D)119

1440 1550 (E) 123lbs. 1910 2280 2470 (C) 2790 3000 (D) 3260 3415 (E)

Tire Load Limits at various Cold Inflation Pressures

TIRE SIZE USAGE kPa 240 280 310 340 380 410 450 480 520 550 590 620 660DESIGNATION psi 35 40 45 50 55 60 65 70 75 80 85 90 95

kg 625 685 740 800 (C)100

840 895 950 (D)105

985 1030 1090 (E)111

1110 1150 1215 (F) 115DUAL lbs. 1380 1515 1630 1765 (C) 1855 1970 2095 (D) 2175 2260 2405 (E) 2450 2540 2680 (F)8.75R16.5LTSINGLE kg 710 780 840 900 (C)

104955 1020 1090 (D)

1111120 1170 1215 (E)

1151260 1310 1360 (F)

119lbs. 1570 1720 1850 1985 (C) 2110 2240 2405 (D) 2470 2570 2680 (E) 2780 2880 3000 (F)

kg 740 810 875 950 (C)106

1000 1060 1120 (D)112

1170 1220 1285 (E)117DUAL lbs. 1635 1785 1925 2095 (C) 2200 2330 2470 (D) 2570 2685 2835 (E)9.50R16.5LT

SINGLEkg 845 920 995 1090 (C)

1111130 1200 1285 (D) 117 1320 1380 1450 (E)

121lbs. 1860 2030 2190 2405 (C) 2500 2650 2835 (D) 2920 3050 3195 (E)

Sometimes, the inner dual is difficult

or impossible to check.You may need to add extension hoses to solve this problem.

CLOCK ’EM!When dual tires are mounted on thevehicle, they should always be put on with the valve stems 180 degreesapart. If one valve is at 12 o’clock, the other should be at 6 o’clock. That’s one way to make checking

inflation pressureseasier.

Dual tires should always be mounted on the vehicle

so that their valve stems are

180 degrees apart.

Dual tires add lots of load capacity to an axle, but

they require the same maintenance as single tires.

The valve stem for the inner tire of a dual may

be difficult or even impossible to reach.

Fortunately, there are things you can do.

If you have rubber valve stems, they should be replaced with properlyrated valve stems every timeyou replace a tire. It’scheap to do, andcould save acostly repair bill later.

What’s even better is to replaceyour rubber valve stems with all-steelstems. On these, you only have

to replace the rubbergrommets each

time. And,

steel stems are necessary if you need to use valve extensions.

All-steel, clamp-in valve stems are recommended on duals,

especially when extensionhoses are in use.

If the holes in the wheels are too small or in the wrong places, it may be impossible to check inflation oninside tires. That’s no excuse for notdoing it, however.

The answer may be adding extension hoses that connect to thevalve stem on the inside tire and arefastened to the outer wheel. That wayyou can check inflation on both tiresquickly and easily.

If you use extension hoses, youmust use all-steel valve stems, because

the extra weight of the hoses can distort rubber stems and causeleaks, especially at highway speeds.

The best extension hoses willhave stainless steel reinforcement and external braiding for long, trouble-free life.

Make sure the ends of the hosesare securely attached to the wheels so that they cannot come loose overtime. We’ve illustrated a couple ofgood methods for attaching the hose ends here.

REPLACE ’EM!

EXTEND ’EM!Adding extension hoses to the inside wheels ofdual assemblies canmake inflation pressuremaintenance easier.

If you use extensionhoses, the hoses must be securely fastened to the wheels, as shown here.

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There is only one way to correctlymeasure the inflation pressure in your tires, and that is with a quality inflation pressure gauge.

Tire “billies,” boot toes, hammers, tire irons and baseball batsare NOT inflation pressure gauges. Nomatter how much experience you have,if you use these techniques, you areNOT measuring inflation pressure, andyou risk serious underinflation of yourtires – and that can be both dangerous

and expensive. Never measure inflation pressures with

anything other than a good gauge.When you buy a gauge, get one

with a double, angled foot. This willmake checking the outer tire ofa dual set much easier. And,treat your tire gauge like anyother precision instrument: don’t drop

it or use it for any purpose other thanthat for which it was made.

If you drop your gauge, take it toyour tire dealer and ask them to check itfor accuracy. Shock can knock any gaugeout of calibration, sometimes by a lot.

No one can tell by looking at a tire whether it has the correct inflation pressure.

The eyes DON’T have it

Another way you CAN’T tell correct inflation is by looking at your tires.With today’s radial tires, a visual inspection cannot be used to verify correct inflation.

Different tires, from different manufacturers will have different degrees of bulge at a given pressure.

The difference between the shape of a correctly inflated tire and one that is dangerously underinflated is too subtle to determine by eye.

Please, always use a good air pressure gauge – and ONLY a good air pressure gauge – to measure the inflation pressure in your tires.

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A professional tire gauge with

a double,angled foot end will

make checking inflation pressures

faster and easier.

70 PSI

60 PSI

50 PSI

40 PSI

Check it out!Considering the hard work RV tireshave to do, if you find any tire 20 percent or more below the correctpressure, treat that tire as a commer-cial vehicle tire (which most RV tiresare): Have the tire removed, demount-ed and inspected – inside and out – bya qualified tire technician.

Driving on a tire that is 20 percent or more underinflated cancause serious, permanent damage to the tire that may not be visible.Only a qualified technician can tell if the tire is safe for continued use.

Tires with internal damage fromunderinflation can fail catastrophi-cally and without warning, a serioussafety hazard.

Check ’em all!Many vehicles have dual tires. You mustcheck both tires because both tires areessential to properly handling the load.The second tire is not a “spare” or a“backup” for the other one.

Both tires should have absolutelyidentical inflation pressures, and bothshould have about the same amount of wear. Neither should show any evidence of serious damage to thetread or sidewalls.

And speaking of spares, be sure to check your spare tires too! If you get a flat along the way, you’ll be gladyou did.

Check through the CAPS

If you’ve ever dropped a valve stemcap into a puddle or lost it in gravel,you’ll really appreciate the new, dou-ble-seal, flow-through valve caps thatare available.

These caps allow you to checkand adjust air pressures without everremoving the caps themselves. Theyhave a good rubber seal, together

with an internal valve thatis designed to keep out dirtand water while allowingyou to check and adjustpressures.

The most commonflow-through cap is the“Alligator V2B.” Ask yourtire dealer for a set. Anddon’t forget one for each ofyour spare tires!

Special, double-seal, flow-through valve caps allow you to inflate and check tires without having to remove valve caps.

Keep it CLEAN!Get your gauge and a clean rag orpaper towel, and wipe each valve stembefore you remove the cap. (And besure every valve stem has a high-quality, metal valve cap with an inner rubber gasket.)

Believe it or not, the metal cap

is the actual seal that keeps the airinside. A good cap will work evenwhen the valve doesn’t. Plastic caps may not provide adequate seal at thehigher inflation pressures used onthese vehicles, especially when fitted with commercial grade tires.

Take the air hose with you, andcheck and adjust each tire to the cor-rect inflation pressure. “Close enough”isn’t. Don’t take a chance. As long asyou’re going to the trouble of check-ing, make sure they’re all correct.

Valve stem caps should always be metal, with an internal rubber seal, never plastic.Keep it “COLD”!Always check inflation when the tires are cold. “Cold” means when they’re atthe same temperature as the outdoor air.

The way to make sure your tires arecold is to either park the vehicle andwait at least 3 hours before checkingpressures, or to let the vehicle sit parkedovernight, then check the pressuresbefore you’ve driven it a mile.

A short, low-speed drive to the gasstation is OK, but not a long, 65-mphfreeway jaunt. Never let air out of a hottire, no matter how high the pressureseems to be. You’ll just end up with anunderinflated tire when it cools down.

ALLOW TIRES TO COOL FOR3 TO 4 HOURS

BEFORE CHECKING INFLATION AND

BEFORE YOU DRIVE MORE THAN 1 MILE.

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KEEPEVERYTHING

STRAIGHTJust as you align the

wheels on your car, it’s

a good idea to check

the alignment of the wheels

on your vehicle. If tires don’t

track together properly, they can

wear too fast or wear unevenly.

Your RV dealer can help you

with alignment issues.

Rotate to equalize

wearIf you have a tire that is wearingunevenly, or one tire that is wearingfaster than another in an equivalentposition, it may be a sign of some kindof misalignment, and you shouldcheck it.

Once the uneven wear has begun,however, you may be able to extendthe life of the tire by moving it to aposition where the wear will be coun-teracted, or to a position where thewear will be slower. If you move a tireto a new position, be sure the inflationpressure is correct for the new position.

Steer tires that are wearing on one side or the other of the tread canoften be swapped from one axle end to the other. Sometimes this can shiftwear away from the part of the tirethat’s excessively worn, evening outoverall wear.

Likewise, if you have a tire posi-tion that consistently wears tires fasterthan another, you may be able to shifttires from the slower-wearing positionsthere, again evening out the wear andextending tire life.

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Assuming all tires on the vehicle are exactly the same size,exactly the same tread pattern and exactly the same load range,there are a variety of rotation patterns you can use to equalizetread wear.

Consult your owner’s manual or tire dealer to select the bestapproach for you.

1-800-543-7522www.trucktires.comwww.tiresafety.com

FMCA[Family Motor Coach Association]

FMCA is an international organization for families who

own and enjoy the recreational use of motorhomes. A portion of the

membership is from the commercialrecreational vehicle industry: dealers, manufacturers and RV component suppliers.

FMCA8291 Clough Pike

Cincinnati, OH 45244

(800) 543-3622(513) 474-3622

www.fmca.com

RMA[Rubber Manufacturers

Association]RMA is the primary national

trade association for the finished rubber products industry in the U.S.

including tires of all types.

RMA1400 K Street NW, Suite 900

Washington, DC 20005

(202) 682-4800

www.rma.org

RVDA[Recreational Vehicle Dealers Association]

RVDA is a national association representing RV dealers, providingeducational programs, products and

services to its members.

RVDA3930 University Drive

Fairfax, VA 22030-2515

(703) 591-7130(703) 591-0734 fax

www.rvda.org

RVIA[Recreational VehicleIndustry Association]

RVIA is a national trade association representing RV

manufacturers, conversion vehiclemanufacturers and suppliers.

RVIA1896 Preston White Drive

P.O. Box 2999Reston, VA 20195-0999

(703) 620-6003

www.rvia.org

RVSEF[Recreational Vehicle Safety

Education Foundation]RVSEF is a nonprofit foundation dedicated to the safety educationneeds of the RV industry. RVSEF created the “A’Weigh We Go” RVweighing program in 1993, and hasweighed thousands of RVs at ralliesand seminars throughout the U.S.

RVSEF4575 Annette Court

Merritt Island, FL 32953

(321) 453-7673(321) 453-3853 fax

www.rvsafety.org

e-mail: staff@rvsafety.org

Presented as a public service by Bridgestone Firestone North American Tire, LLC.

535 Marriott DriveNashville, TN 37214

(800) 543-7522www.trucktires.comwww.tiresafety.com

There are numerous organizations that can help you operate your vehicle safely and answer questions you may have about tire and component life. A few are listed here. Remember also to contact the dealer who sold you your vehicle and your tire dealer for additional information.

©2006, Bridgestone Firestone North American Tire, LLC BF50998 8-06 (40M)

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