oRIMS •

RIMS

RESISTANCE TOVERTICAL LOAD

In use, as a result of the ra-cer's weight, the rim undergoesvertical stresses and transversal andtorsional stresses due to the forcesresulting from pedaling dynamics.

Campagnolo has paid particu-lar attention to determining the re-sistance of the vertical load sinceboth durability and comfort are di-rectly related to this parameter.

T he rim works like a Romanarch which supports itself by di-spersing its weight along the cir-cumference. However, in order tosupport loads which ouweigh itwithout being deformed. the radial

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tension in a rim with 32 spokesmust be greater than 65 Kg; onthe back wheel, this tension mustbe greater than 110 Kg on theright and 60 Kg on the left.

The racer's weight is appliedto the hub. by studying the bcha-vour of a spoked wh\..'l..~ fitted witha rim of a kno....'11 profile, thicknessand material, engineers have creat-ed a mathematical and physicalmodel. This model enabled the ac-tual stresses on the rim due to theweight to be precisely determined.

The weight applied to thehub is essentially balanced bymeans of 5 spokes (Fig. 0, whose

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tension is reduced because of thecompression. The rest of the sys-tem does not undergo importantalterations. O n the basis of theseconsiderations, Campagnolo hasworked out profiles and materialsfor its whole range of rims thatsolve both problems: resistance tovertical loads, and comfort for theracer.

The best level of rigidity ofthe various rims, as a function oftheir use, has been determined bymeans of theoretical results androad-test Such rigidity ensures thereliability of the rim, even in caseof bumps and rough roads, wi-thout reducing its elasticity andcomfort (Figs. 2 and 3) .

RESISTANCE TOTRANSVERSALAND TORSIOl\'ALSTRESSES

Besides the racer's wei~: ~rim undergoes transversal a~': :.........sional stresses resulting from ::.-:push on pedals.

The ability to absorb thesestresses is fundamental for ':-.e re-liability and efficiency of the :""_'7..

This feature has been 0;'::'-mized by Camp agnolo for itswhole range of performance :""_~

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SIGMACRONO

AMOUNT OFPERMANENTDEFORMATION

TOPSIGMA CORSASTRADA 20

SIG MASTRADASIGMA

PAVE '

PERMANENT DEFORMATION GIVEN THE SAME TRANSVERSE LOAD

and in particular for SIG MADELTA and OMEGA rims.

In this way the professional oramateur racer does not waste partof the energy he produces whilepedaling

Transversal loads and absorb-ing capacity are always checked byC arnpagnolo's quality control labo-ratory, which utilizes the mostmodem equipment

The capacity to absorb trans-.ersal stresses directly affects thedurability of the rim's centeringhold- no longer will the cyclist' smechanics spend long work hoursre-centering all the wheels at theend of the laps IUn on rough roads(Figs 4 and 5).

The very high elastic limit(even improved in the SIG~1Arange) gives C ampagnolo rims avery high centering reliability dur-ing the assembly phase. Thanks toCampagnolo, building a professi-onal wheel in a few minutes willbecome increasingly common.

AMOUNT OFPERMANENTDEFORMATION

OMEGADELTA

PATENTEDPOSmONEDEYELETS

LAMBDA EPSI LONTOPAMATEURS

Campagnolo rims feature aninnovative, patented eyelet, whichmakes the assembly, centering andbalancing of the wheel easier.

Campagnolo eyelets acceptspoke nipples in a seat withdouble positioning. according totheir working position: camber po-sitioning, with an angle of 5 de-grees (Fig. 7) . Campagnolo usesonly double eyelets coated withtropicalized zinc-plating. These en-able the load to De distributed in

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SIGMA

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Campagnolo SIGMA rimshave been created by the expert-ence achieved throUghJeafS ofraces on every road an track inthe world, and meet all competi-tive requirements.

The material util ized, Ergal,an aluminium zinc alloy used inaeronautics, has a very high elasticlimit (54 Kg/rum") and a remak-able breaking load (62 Kglmm') .

In project design, the highestconsideration was given to the rigi-dity/elasticiry combination in orderto ensure the trueness of the rimand its ability to withstand defor-mation under stress, including ab-sorption of impacts.

Thanks to the technology andchoice of the material, Campag-nolo SIGMA rims can easily betrued, this saves mechanics hoursof wheel. adjustment after- a race

Patented eyelets, positionedaccording to the camber and thecrossing. are safer with regards tothe duration of spokes, remarkablyreducing the possibilities of break-age in the most critical zones.

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oTYPE FINISH PROFILE RECOMMENDED USE

- This is the professional rim par excellence. Designed forChromium ««: ~ tough competitions, and for particularly rough roads where«paves makes the selection. Only those who can rely on the

SIGMA Pave qualities of the strength of their rims can hope to emerge as.'- winners.

Hardox The CHROMIUM version maintains the beauty and theluster of the rim.

Chromium r-: 4 The rim for racers and competition. Resistant, and most ofall, very 11ht, it is appreciated in all conditions on sprints,SIGMA Strada ¥bhill an flat roads.

,'-- ~ e CHROMIUM version includes a surface finishing whichHardox is resistant even in unfavorable meteorological conditions.

Chromium ~ ~' The ideal complement to Compagnolo-equipped byd cles,with super-l~t frames and designed by name s~ecia1ists. ItSIGMA 20 Strada is a rim whi , thanks to E~l, is particularly lig t, coupling

c-: .». great ~alities of ~dity wi high elasticity to make it par-Hardox ticular y comfortab e in use.

~ ~ The rim for specialized uses (time trial, track. erc.].Very light, (only 330 gr]: it has a high vertical elasticity

SIGMA Crono Oxide which absorbs vibrations well.The transversal rigidity is such that it does not cause defer-

Imations under the action of the racer's push.

TYPE FINISH DJAMETRE DRILLING WEIGHT THICKNESS WlDTH, ,, rnm. mm

SIGMA Pave Chromium28" 24-28-32 410 I.I 22(700 C) 36-40

SIGMA Pave H ardox28" 24-28-32 410 I.I 22(700 C) 36-40

SIGMA Strada Chromium28" 24-28-32 380 1.0 22(700 C) 36-40

SIGMA Strada H ardox28" 24-28-3Z 380 1.0 22(700 C) 36-40

SIGMA 20 Strada Chromium28" 32-36 380 I.I 20(700 C)

SIGMA 20 Strada H ardox28"

32-36 380 I.I 20(700 C)

-SIGMA Crono O xide

28" 24-28-32330 0.9 20(700 C) 36-40

\\"~,ghts arc meant for 32 -eydct rim.. each eyelet weight> 1.52 gr. _ N.B. For thickness v. riation> of± 0 .04 mm .,;d w~ght may vary by ± 12 gr.

DELTA o

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The aluminium-magnesiumalloy used for the D elta rims hasan elastic module and a breakageload level which ensure both ma-ximum reliability and easy center-mg.

The Delta rim project has gi-ven great importance to wear resis-tance. T wo thicknesses of 13/ 10mm were chosen and the galvanictreatment of the aluminium usedleaves the surface of the rim prac-tically unaltered by time and use.

These characteristics makeD elta rims particularly suited fortriathlons, In fact, in triathlons theenvironmental factors which comeinto contact with the bicycle areparticularly corrosive and unusualfor cycling, The D elta rims areunaffected by the condition of theseawater which an athlete carrieswith him after the swimmingevent.

The street surface is often

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TYPE fTI\ISH DRIli.ING WEIGHT RECOMMENDED USE' "

Chromium 24-28-32The rim for J:rofessional racers who value versatility. For

DELTA 22 36-40 465 races on rna with irregular surfaces and, thanks to the r-'chrome. for unfavorable meteorological conditions.

DELTA Strada XLFor those who love cydint, and practice it~Iary.

Chromium24-28-32 405 The XL version is geared or professional cy ists, includ-

DELTA Strada 36-40 445 ing stage races. It suitable even for triathlons and for thecorrosive enviroments where this sport takes p lace.

. .W...~ts _moNlI fur ]1

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OMEGA

The Campagnolo Omega rims-

EPSILON oThe Epsilon rims are very

strong, due to the use of the testedaluminium/magnesium alloy witha breaking load of 33 Kglsq mm,treated with a t ransparent anodicoxidation finish which gives therim brilliant color.

The Epsilon rims are alsoavailable with a new exclusiveanodic oxidation finish G25. thi-cker than the transparent one andhas elegant gray color.

The Campagnolo Epsilonrims can be assembled even bymachine and, thanks to its profile,and eyelet, which is positioned ac-cording to the camber and thecrossing, they maintain their cen-tering Perfectly.

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TYPE FINISH DRILLING WEIGtrr R£CO~1MENDED t:SE~~

EPSILON Strada G25 32-36 445 r-For better bicycles, made for touring and for those wholove to practice a sport which is particularly good fo rkeeping the body fit and in harmony with itself.

EPSILON Strada Oxide 32-36 445

w ...., .......nt n. 32 r..n.k rt ...... ,,""" f~l" ts I.~ Z • I" .B. Few thi, ~__,onsof + 0JI4 """ ..0

lA.c'vlBDA

\ Vith the Lambda rims, Cam-......rcsnolo has created a solution

.-::J.:h is technologically similar to:.'-..;.: designed for competition butwaich nevertheless allows an envi--' e: quality/price advantage so its-echaology is affordable for a largeccraber of bicycle lovers.

The patented Campagnoloevelet is mounted on the Lambda-:'..s as well.

The aluminium/magnesiumL

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