Bsi bs au 050 1 1 2 2001 (iso 17269 2000)

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50 1.1.2:20 0 1

I SO 17 26 9 :20 00

T h isBrit ishSt an d ard ,h avin g

b enpre aredu n d ert h e

d iret ionoft h eEn g in eerin g

S ct orCom m it t ee,w aspublsh ed

u n d ert h eauth orit yofth e

St an d ard sCom m it tee n dc m es

in t oefe ton15Apri 20 1

A mendmentsis u edsincepubl ca tion

TheUKp rtic ipatio initsprep ratio wasentrus tedtoTec hnic alCommitte e

AUE/4,Tyresa dwhe lsformotorvehic le s , whic hh sthere s po s ibilityto:

Ð aide nq irer tou ders ta dthetext;

Ð pres ent othere s po s ibleintern tion l/Euro ea c ommitte ea yen uiries

o theinterpretatio ,orpro os alsforc ha ge ,a dkee ptheUKinteres ts

informed;

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themintheUK

Alis toforganiz atio srepre s entedo thisc ommite c anbeo tainedo re ques tto

itss ec retary

Cros -r efer ences

TheB ritis hS ta d rdswhic himpleme ntintern tio alp b c ationsreferedtointhis

d c umentma befo n intheB S IS ta d rdsCatalogueu derthes ec tione ntitled

ªI ntern tio alS ta d rdsCores po denc eI nde xº,orb us ingtheªFindºfac ilityof

theBS IS ta d rdsElec tro icCatalogue

AB ritis hS ta darddoesn tp rp rt oinc ludeal thenec es s arypro is ionsofa

c ontrac t.Us er ofB ritis hS ta d rdsareres po s ibleforthe irc orec ta plic atio

Compla ncewithaBritishSta nda rddo snotofitselfconferimmu ity

f omleg a lo lg a tions

Summaryofpa ges

Thisd c umentc ompris esafo tc over,a ins idefo tc over,theI S Otitlep ge,

p gesiitoiv,p ges1to8,a ins ideb c kc overa dab c kc over

TheB S Ic op rightn tic edis playedinthisd c umentin ic ate swhenthed c ument

waslas tis s ued

Fir ste it io

2 0 -12-01

Pn umatiq esp urv iurespartculères—Méth desdemesuredela

circo fére cedero leme t—Pn umatq esn ufse charg

Contents Page

Foreword iv

1 Sc pe 1

2 Normativ refere c 1

3 Termsa ddefinitio s 1

4 Drum metho 2

5 Te tmeth d u ingv hicle .4

Anne eA(informativ e) Te t e uipme t olera c s 7

Biblo raphy .8

ISO(heInternational Or ganizationforStan ardization)isaw orldwidefederation ofnational stan ar dsb dies(ISO

memb r b dies) The work of pre arin Inter national Stan ard is normaly carr ied out throu h ISO tec nical

commite s Eac memb rb d interested in as bject orw hic atec nical commite has b en esta ls ed has

therig t ob re resented on thatcommite nternational organization , gov er nmental an non-governmental, in

laison with ISO, also take p rt in the w ork ISO cola orates closely with the International Electr otec nical

Commis ion (IEC) onal matersofelectrotec nical stan ardization

Inter nationalStan ard aredrafed in ac ordan ewiththerulesgiv en in theISO/ IECDirectives,Part3

Dr af Inter national Stan ard ado ted by thetec nical commite s ar ecir culated tothememb r b diesforvotin

PublcationasanInternationalStan ardreq iresa provalbyatle st7 %of hememb rb diescastin av ote

Atention is draw n tothe p s ibi tythatsomeof he elements of his International Stan ar d mayb thes bject of

p tentr i hts SOs al notb heldresp n ibleforidentify in an oral s c p tentrig ts

International Stan ar d ISO17 6 w as pre ared by Tec nical Commite ISO/TC31, Tyres, rims and valv s,

Subcommite SC3, Pa se g rc rtyresandrims

An exAof hisInternational Stan ar d isforinformation only

INTENRAT IONALT SANDADR ISO 9 2 1:(0 0 )E

This International Stan ard sp cifies tw o method for me s r i g, u der lo ded con ition , the rol n

circ mfer en e an revolution p ru itdistan e (kiometr es) ofnewtyresforu eon p s en ercars Thefirstis a

drum method thatcon ists of lo din a test y remou ted on a fre axleagain ta driv en ro d w he l, ordr um, of

sp cified diamete Thesecon in olvesu in av ehiclewhosedriveaxleiseq ip ed with thetest y r esdriven on

astraig t,p vedro d

This International Stan ard is a plca le to al p s en er car ty r es How ev er, the values o tained from the

me s r ementsar enotinten edtob u ed asb n hmar k s forp rfor man eorq alty

2 Normativ e reference

Thefolow in normativedoc mentcontain provision w hic , thr ou h r eferen ein thistext,con tituteprovision of

this International Stan ar d For dated r eferen es, s bseq ent amen ments to, or revision of, an of these

publcation donota ply However, p rtiestoagre mentsb sed on thisInter national Stan ard areen ouraged to

inv estigate the p s ibi ty of a ply in the most recent edition of the nor mative doc ment in icated b low For

u dated referen es, the latest edition of the nor mative doc ment refered to a ples Memb r s of ISO an IEC

maintainregister sofc r rentlyv aldInter nationalStan ar ds

ISO4 0 -1,Pa se g rc rtyresandrims—Part1:Tyres(metricseries)

3 Terms and definitions

Forthepurp sesof hisInternational Stan ard,thefolow in ter msan definition a ply

3.1

re olutio speru itdista c

n mb r of tyre revolution , an p r ts ofrevolution , that oc urw hen the(axle) centr e of the tyre is mov ed a u it

distan eofexactly1 k m;then mb rof y r erev olution p rkiometreiscalc lated asonediv ided bythetyrer ol n

circ mfer en e(in mi imetres)multipled by10

6

3.2

rol n circ mfere c oftyre

C

r

distan ecovered bythety red rin onecompleterev olution

Atest y remou ted on afre axleislo ded again tadriven ro d whe l(drum)ofsp cified diameter Thev alueof

therol n circ mferen e isdetermined forasp cified sp ed, the tyrean drum revolution ar ecou ted an u ed

in thefor mula,an theformulathen u ed todeterminethetyre’srol n cir cumfer en e

4.2 T estdrum s e ific tions

4.2.1 Diameter

The test dr um s al have a diameter of at le st 1,2 m, with a fre axle ca a le of holdin an lo din a ty re

again t hedrivendrum.Cares al b takentoav oid galo in d rin me s r ements

4.2.2 Surfa e

Thes rfaceof hedr um s ould pr efera lyb ofsmo thste l n caseswhereatextured dr um s r faceisu ed, this

s al b notedinthetestre ort.Thes rfaceof hedrum s al b ke tcle n

4.2.3 Width

Thew idth of hedrum tests rfaces al ex e dthatof hetest yretr ead

4.3 T hermal e v ironme t

Thetests ould prefera lyb car ried outatareferen ero m temp r atur eof2 °C Howeve itmayb p r for med

in ther an e2 °Cto3 °C Notemp raturecor rectionisr eq ir ed

4.4 Spee

Inordertoesta ls ab sicreferen eforr ol n circ mferen eforal tyres,thedr um v elocitys al b 8 k m/h

Forradialtyres,lne ras umptionisalowed fortherelationb twe nr ol n circ mferen ev aluesan thesp ed of

the tyre in the ran e 8 k m/h ? 5 k m/h, an the rol n cir cumferen e may b evaluated at 8 km/h by lne r

interp lation withinthatran e

4.5 Ac ura y

Theminimum n mb rofimpulses(N

i )p rr evolutionofb th thety rean thedrum s al b 10 Thetotal n mb rof

impulsesd rin thetimeofme s r ements ould b gr eaterthan1 0 0

4.6 T esttyreparameters

4.6.1 Lo d

The stan ar d test lo d s al b computed from 8 % of the lo d ca acity , coresp n in to the lo d in ex (LI)

mouldedonthetyresidew al,or8 %of hemaximum p rmis iblelo d

L ada plcations al b ke tnormal tothetests r facean s al p s w ithin 5mrad of hewhe lcentre

4.6.2 Al g me t

4.6.2.1 Slpa gle

Theplaneof hetyres al b p r alel, within3mr ad,tothedirection of hetests rfacemotion

4.6.2.2 Cambera gle

Theplaneof hewhe ls al b nor mal, within10mrad,tothetests rface

4.7 Inflation pre s re

Theinflation pres ureof hetest yreatambient emp ratures al b 3 kPa les than thereferen e pres urefor

thety r ecategoriessp cified in an exB ofISO 4 0 -1:2 0 Thepres ur emayb eitherr eg lated orca p d For

ty resnotsp cifiedinISO4 0 -1,thereferen einflation pres ures al b thatgiv enbythety reman facturer

4.8 Rims

Ther imsu edin thetests ould b ofasizean ty pea proved bythety reman facturerforu ew ith thetest yres

in hig w ayservice fs c rims arenotav aia le, ortheinformation is u k ow n, astan ar d me s r i g rim, orthe

rim ne rest oit,s al b u ed inthetest

4.9 Proc dure

a) Toen urere e ta i tyof me s rements, an initial bre k-in an co ln p riod can b neces arypriorto the

startof hetest.Car yout hisbr eak-inon atestdrum ofatle st1,2 m,forap riod ofnotles thanonehour,

ataminimum v elocityof8 k m/h, an at helo d an inflation pres uresp cified in 4.6.1 an 4.7

b) Forfuturecomp rison ,record theov er al diameterof henewty r eaferthebre k-in

c) A llow the ty r e to stan , inflated, in the test ar ea thermal en ir onment in order for it to ac ieve ther mal

eq i brium, generalyre c ed afer3h

d) A dju t the inflation pres ure to thatsp cified in 4.7 an afera out10min, v erify the lo d is as sp cified in

4.6.1

e) Rotate thedr um at he test sp ed fora proximately 3 min to war m up the ty re A fter w ar m-up, the inflation

pres ur e may not b r eadju ted u der ca p d-pres ure con ition , an the test s al b ru with pr es ure

buid-up to simulate normal service con ition The v alues o tained u derreg lated pres ure con ition wi

b simiartothoseo tainedu in ca p d pres ure

4.10 Calc lation

4.10.1 Record then mb rofr evolution an p r tsofrevolution of thedr um oc ur in d r i g a timed r ation, T,

takin caretoen urethat,forb th ty rean dr um,thetotaln mb rofimpulsesd rin Tisgre terthan 1 0 0

4.10.2 Calc latethetest y r e’srol n circ mferen e,C

r , inmi imetr es, u in thefor mula:

d

r

t 2

N

N

? ?

?

?

13

K

?

?

?

?

wher e

R

1

isther adiu ofdrum 1,inmi imetr es;

R

2

isther adiu ofdrum 2,inmi imetr es;

r

T

isthenominalty r eradiu , inmi imetres;

C

r ,R01

istherol n circ mferen eme s r edon drum 1, in mi imetres;

C

r ,R0

istherol n circ mferen eme s r edon drum 2, in mi imetres

4.10.4 Res lts o tained u in the formula given in 4.10.2 can b cor related with those o tained by ro d

simulation onaflats r face, w hic iscarr iedoutu in thefolowin empirical formula:

C ?K?C

with

13

1

R

K

?

?

?

wher e

R

1

istheradiu ofdrum 1,in mi metr es;

r

T

isthenominal tyreradiu ,in mi imetres;

C

r D

istherol n circ mfer en eme s red onthedrum,in mi imetres;

C

r F

istherol n circ mferen eme s red onaflats r face, inmi imetres

5 T est method using v ehicle

5.1 Principle

Thismethod con istsofdrivin atypicalv ehiclew hosedriv eaxleisfited w ith thetest y resatacon tantsp ed on

astraig t, level, p ved ro d, an cou tin then mb rof yrerevolution , orp rtsofrev olution , thatoc urd r i g

5.2 Conditions

5.2.1 Co rs

Thetestcour ses al b alevel, straig tsection ofsmo th, dryro d, whoses rfaceisofeitherasphaltorcon rete

p vementofmedium rou h es Themaximum lon itu inal an tr an v ersegradientof hero d s al b 1 % The

len th of the cour se s ould prefera ly b 5 0m, but may b lon er de en in on the ac ur ac of the test

eq ipment se 5.4)

Thelen thof hetestcour se,expr es edinmetres,s al b me s redtow ithin0,1 %

Ther es al b ana pro c ro datb then sof hetestcour setoalowthecour setob enteredat hetestsp ed

5.2.2 We th r

The ambient temp r ature s al b b tw een 5 °C an 3 °C Howeve an asphaltic s rface s al b s ficiently

co lsothat hes r faceisnot ac y.Thew in sp eds al notex e d 7m/s

Thetestsp ed s al b inther an e8 k m/h ?2k m/h

For adial ty r es, lne ras umption isalow edfortherelation b twe n rol n circ mferen ev aluesan thesp edof

thetyreintheran e8 k m/h ?5 k m/h

5.4 Ac ura y

The minimum n mb r of impulses p r revolution s al b 16 The ov eral er ror in the revolution-cou tin

eq ipment, in lu in startan sto err ors, s al notex e d0,1 %

5.5 Ve icle

Thetestv ehicles al b re resentativ eof hesizeofvehiclenormalyfited w ith ty resthesamesizeasthoseb in

tested

Becau e most sp edometers an odometers ar e actuated from thedrive-s af, thetest tyres s al b fited tothe

driveaxle.Forfour -w he l driv ev ehicles,oneortheotherof hed v eaxless al b disen agedd r i gthetest

5.6 Test tyrea drimparameters

5.6.1 Ty re

Thetyres s al b a matc ed set of the same size, desig ation, ty pean br an , havin inflated, u lo ded ov eral

diameterswithin 0,5%ofe c other

Forfutur ecomp rison ,record theov er al diameterof henewty res, me s r ed ac or din toISO4 0 -1

5.6.2 Lo d

the ty re categoriessp cified in an ex B of ISO 4 0 -1:2 0 Fortyres notsp cified in ISO 4 0 -1, the referen e

inflation pres ur es al b thatgiv enbythety reman facturer

5.6.4 Rims

Ther imsu ed inthetests ould b ofasizean ty pea proved bythety reman facturerforu ew ith thetest yres

in hig w ayservice fs c rimsare notav aia le, ortheinformation isu k ow n, a stan ard me s rin rim, orthe

rim ne rest oit, s al b u edin thetest

5.7 Proc dure

a) Priorto the test, bre k in an con ition the ty res by ru nin for at le st halfan hour at an aver agesp ed of

a proximately8 k m/hat hesp cified lo dan inflation pres ur e

b) Immediatelyafercon itionin , ru thetestat hesp ed an on thecour sesp cified

c) Limitac eleration,brakin , an ste rin toan a soluteminimum d r i g theme s rements

d) Recor d the n mb r of rev olution , an p r ts of revolution , of the r i ht an lef testwhe ls, d rin the time

taken forthev ehicletocompletethetestcourse

e) Re e t hetest w icein b th dir ection f the n mb rofrevolution fore c whe l on the secon ru difers

from the first in the same direction by more than 0,2 %, r ep at the test u ti tw o ru s are o tained in e c

dir ection withinthistoleran e

5.8 Calc lation

5.8.1 Calc late for e c of the eig t re din s (i.e four ru s for e c driv e w he l) ac ordin to 4.3.9 e) an

averagetheeig tcalc lation too tainther atedvalue

5.8.2 To determine the rol n cir cumferen e, div ide the test course len th (in metres) by the n mb r of

rev olution me s redan multiplythisby10

3

Rou d thisvaluetothene r estu it

Annex A

(infor ma tiv e)

T est equipment tolerances

These lmits are given in order to ac iev e s ita le levels of re e ta le test res lts thatcan b corelated amon

var iou testla or atories Thetoler an esarenotinten ed tore resentacompletesetofen ine rin sp cification

fortesteq ipment, but oserv easg idelnesforac ievin rela letestres lts

Ex lu in p r turb tion in u ed bynon-u iform tyresan rims, thetesteq ipments ould b ca a le of c ec in

thetestvar ia leswithinthefolow in lmits:

? tyrelo din :?5 N;

? inflationpr es ure:?5kPa;

? s rfacev elocity : ?0,5k m/h;

? drum me s r ementac urac :?1 mm;

? tyrean ularv elocity:?0,2%

[1] ISO10191,Pa se g rc rtyres—Verifyin tyrec pabi ies—L b ratorytestmeth ds.

[2] ISO4 2 -1,Defini o sofsometermsusedinth tyreindustry—Part1:Pn umatctyres

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