Bsi bs au 050 1 6 1c 2002 (iso 5751 1 2001)

BRITISH STANDARD AUTOMOBILE SERIES BS AU 50 1 6 1c 2002 ISO 5751 1 2001 Tyres and wheels — Part 1 Tyres — Section 6 Motorcycle tyres — Subsection 6 1c Specification of general requirements and design[.]

50- 1.6.1c:2002

ICS 8 1 0.1

NO COPYING WITH UT BSI PERM IS ION E C P ASPER M IT E BY COPYR IGHT L AW

This Br itsh Stan ard,ha ing

b en pre ared u d er the

directon of the Engine ring

Sector Policy an Strateg y

Commi e , was published

u der the authoriy of the

Stan ard s Policy n Strateg y

Commi e on 1 Marh 2 0

© BSI 1 Marh 2 0

ISBN 0 5 0 3 1 6 7

Th is British Stand r d reproduces verb tim ISO 5 51-1:20 1 an d implements

it as the UK national stand ard It super edes BS AU 5 -1.6.1b:19 5 which is

withdrawn

The UK p rticip tion in its prep ration was entrusted to Tech ical Commit e

AUE/ 4, Ty res and whe ls for motor v ehicles, which has the responsibi ity to:

A lst of org anizations represented on this commit e can be obtained on

req uest to its sec etary

Cros -referenc s

Th e British Stand r ds which implement international o Eur opean

publcations refer red to in this document ma be found in the BSI Stand rds

Catalogue u der the section entitled “ nter national Stand rds Cor espond ence

Index”, or b using the “F ind” faci ity of the BSI Stand rds Electr onic

Catalog ue

A British Stand rd do s not purport to include al the neces ary prov isions of

a contract User of British Stand rds are responsible for their cor ect

a pl cation

Com pl a nc with a British Standard does not of itself confer im m unity

f om leg al o l g ations

— aid enq uir er to u der tand the tex t;

— present to the responsible international/ European commit e any

enq uiries on the interpretation , or proposals for change, and ke p the

UK interests informed ;

— monitor r elated international and Eur opean dev elopments and

promulg ate them in the UK

Sum m ary of pag es

This document comprises a f ont cov er,an inside font cov er, the ISO title p g e,

p g es i to iv , p g es 1 to 14, an inside b ck cov er and a b ck cov er

The BSI copy right d te display ed in this document ind icates when the

document was last is ued

Am endm ents is ued sinc publ cation

Pn umatiq e et ja te p ur moto cycle (s érie mi imétriqu es ) —

Partie 1: Guide de co nceptio

i

Foreword iv

1 Scope 1

2 Norma v refere c s 1

3 Terms a d d finit ion 1

4 Ty re d sig a on 1

5 Ty re dime sion 5

6 Tre d config ra ons .7

7 Ty re loa - carrying c pa it y 8

8 Spe d symb ls 10 9 Ce t rifu al radiu 1

An e A (informat ive) Guid l n v lu s for met ric s rie 12

Bibl ograph 14

iv

Foreword

ISO (t he Int er national Organization for St an ardizat ion) is a worldw ide federat ion of nat ional st an ard b dies (ISO

memb r b dies) The wor k of pre arin Int ernat ional Stan ard is normaly caried out t hrou h ISO tec nical

commit t ees Eac memb r b d int erest ed in a s bject for w hic a t ec nical commit t ee has b en est abls ed has

t he rig t t o b re resent ed on t hat commit t ee Int ernat ional organization , government al an non-gov ernment al, in

laison with ISO, also tak e p rt in t he work ISO cola orates closely w ith the Int ernat ional Elect rotec nical

Commis ion (IEC) on al mat t ers of elect rot ec nical stan ar dization

Int ernat ional St an ard are draft ed in ac ordan e w it h t he rules given in the ISO/IEC Direct iv es, Part 3

The main t as of t ec nical commit t ees is t o pr ep re Int ernational St an ar ds Draft Int ernat ional St an ard ado t ed

by the t ec nical commit t ees are circ lated to t he memb r b dies for v ot in Publcat ion as an Internat ional

St an ard req ires a proval by at le st 7 % of t he memb r b dies cast in a vot e

At t ent ion is drawn t o the p s ibi ty t hat some of t he element s of t his p rt of ISO 5 51 may b t he s bject of p t ent

rig t s ISO s al not b held resp n ible for identifyin an or al s c p t ent rig ts

ISO 5 51-1 w as pre ared by Tec nical Commit t ee ISO/TC 31, Tyres , rims a d v lv s , Subcommit t ee SC 10,

Cycle, mo ed, motorc cle tyres a d rims

This fift h edition can els an re laces t he fourt h edition (ISO 5 51-1:19 4), w hic has b en tec nicaly revised

ISO 5 51 con ist s of t he folow in p rt s, u der the general tit le Mo torcycle tyre a d rims (metric s eries ):

 Part 1: D es ig g ide

 Part 2 : Tyre dime sio s a d lo d-caryin cap citie

 Part 3 : Ra g ofa p ro ed rim conto urs

Anne A of t his p rt of ISO 5 51 is for informat ion only

INT ENRATIONALTS ANDA DR IS- 1575 O1:(10 2)E

This p rt of ISO 5 51 gives g idelnes for t he desig an sp cifies the desig at ion, t he calc lation of dimen ion

an the lo d-carr yin ca acity of met ric-series mot orc cle tyres

This p rt of ISO 5 51 is a plca le t o mot orc cle tyres wit h a red ced heig t / w idt h rat io (10 an low er) t hat can

b fit t ed on c ln r ical b ad se t rims or 5° t ap red b ad se t rims It is also a plca le t o ot her con e t s of tyre

an rim, in w hic case, how ever, t he a pro riat e r im/sect ion ratios an co ficient s wil hav e to b est abls ed

NOT E Se ISO 4 4 for re uireme ts c ov erin motorc y cle t y res a d rims (c d -d sig at ed series) of rim diamet er c od

13 a d a ov e, a d ISO 6 5 for t hose of c od 12 a d b low

2 Normat ive references

The folow in normat iv e doc ment s cont ain provision whic , throu h referen e in t his t ex t , con tit ute pr ovision of

t his p rt of ISO 5 51 F r dat ed referen es, s bseq ent amen ment s t o, or rev ision of, an of t hese publcat ion

do not a ply Howev er, p rt ies t o agr eement s b sed on t his p rt of ISO 5 51 are en ouraged t o inv estigat e the

p s ibi ty of a plyin t he most recent edit ion of t he normat iv e doc ments in icated b low For u dated

referen es, t he latest edit ion of t he normat iv e doc ment refered t o a ples Memb rs of ISO an IEC maint ain

regist ers of c rent ly v ald Int ernational Stan ard

ISO 4 0 -2, Pas s en er car tyre a d rims — Part 2 : Rims

ISO 4 2 -1, D efinitio s ofso me terms us ed in th tyre indus try — Part 1: Pn umatic tyres

ISO 4 51-3, Tyre (ply ratin mark d s eries ) a d rims for a ricultural tracto rs a d machin s — Part 3: R ims

3 Terms and definitions

F r t he purp ses of t his p r t of ISO 5 51, t he t erms an definit ion given in ISO 4 2 -1 a ply

4.1 Ge eral

The desig at ion of t he tyre s al b s own on it s sidew al an s al in lu e t he folowin markin s, placed close to

e c other:

 siz e an con t ru t ion (se 4.2);

 serv ice des ript ion (se 4.3)

1

2 © ISO 10 2 – Allr t hg er s d v r

4.2 Size and construc tion

4.2.1 Chara teristic

The size an con t ru t ion c aract eristic s al b in icat ed as folows:

Nomin l

s ction

w idth

§Nomin l

The nominal asp ct ratio s al b ex pres ed as a p r cent age It s al b a mult iple of 10 for asp ct rat ios 7 an

hig er, an a mult iple of 5 for asp ct ratios lower than 7

4.2.4 Tyre con tru tion cod

The tyr e con t ru t ion code s al b

 “B” for bias b lt ed typ con t ru t ion ,

 “-” for diagonal ply tyr es, an

 “R” for radial ply tyres

NOT E 1 Se also 4.4.3 Ot her c od s wi b est ablsh d for n w c onc ept s (c nst ru t io s) of t y res

NOT E 2 T he t erm “bias b lt ed c onst ru t io ” d scrib s a p e matic t y re st ruc t ure of dia o al (bias ply ) t y pe in whic the

c rc as is rest ric t ed b a su st ant ialy in xt ensible c irc umfere t ial b lt

NOT E 3 With refere c e t o t he d finit io of ra ial ply t y re giv en in ISO 4 2 -1, for t he p rp ses of t his p rt of ISO 5 51,

“su st antialy at 9 °” me ns a gles b t we n 7 ° a d 9 ° as me sure from t he c ent reln of t he t re d

4.2.5 Nomin l rim diameter

The nominal rim diamet er s al normaly b ex pres ed by a code (se Ta le 1) Howev er, it s al b ex pres ed in

mi imet res for new an fut ure con e t s w here t he a plcat ion eit her of ex ist in tyres on new-con e t rims or of

new-con e t yr es on ex ist in rims would b in omp t ible

4.3 Servic description

The c aract erist ic s al b in icat ed as folows:

The lo d in e is a n meric al code as ociat ed with t he max imum lo d a tyre can carr y at t he sp ed in icat ed by it s

sp ed s mb l u der t he con ition sp cified in clau e 7 (se Ta le 3)

The sp ed s mb l in icat es t he sp ed cat egor y in whic t he tyr e can carr y the lo d coresp n in t o it s lo d in ex

u der the ser v ice con it ion sp cified in clau e 7 (se Ta le 4)

2

I © SO – 10 2 A ll irt hg ers d v r 3

Table 1 — Nomin l rim diameter a d rim width cod s

Dime sio s in mi metres

4.4 Other servic c ara terist ics

4.4.1 In t he case of t ub les tyres, t he markin “TUBELESS” s al b s own on the tyre

4.4.2 In t he case of a prefered direct ion of rot at ion of t he tyre, an arow s al b u ed to in icate t hat direct ion

4.4.3 Tyres desig ed for v ehicles havin a maximum sp ed ca acity in ex ces of 2 0 k m/h s al b ident ified by

me n of t he code let t ers

 “V B” or “Z ” for bias-b lt ed con t ru t ion,

 “V R ” or “ZR ” for radial con t ru t ion,

w here “Z ” an “ZR ” s ould b u ed for new ly desig ed mot orc cles with a max imum sp ed over 2 0 k m/h

This identificat ion s al b placed in ide t he tyre desig at ion (se 4.2) in t ead of in t he tyre con t ru t ion code

F r sp ed cat egor y “V ”, “V B” or “V R” tyres s it able for sp ed of ov er 2 0 k m/h, a serv ice des ript ion w it h t he

4 © ISO 10 2 – Allr t hg er s d v r

If t he same tyres are s ita le for sp ed of ov er 2 0 km/h, t he serv ice des ription s al b marked in p rent heses

EXA MPLE 3 12 / 60 ZR 17 (5 W)

4.4.4 F r nominal rim diamet er codes 13 an a ov e, t he s fix “M/C” s al b ad ed t o t he size an con t ru tion

markin , t o prev ent confu ion an misfit t in of mot orc cle tyres on r ims hav in t he same nominal diamet ers but

desig ed primariy for p s en er car tyr es in ac ordan e wit h ISO 4 0 -2 or ag c ltural tyres in ac ordan e wit h

ISO 4 51-3

4.4.5 The max imum sp ed a prov ed by t he tyr e man fact urer may b marked on t he ty re

EXA MPLE “V 25 ” t o id nt ify a ma imum sp e of 2 0 k m/ h

4.4.6 The s mb l “MST” may b u ed t o identify sp cial ser v ice tyres

4.4.7 The s mb l “DP” may b u ed t o ident ify t re d typ C tyres

4.5 Ex amples

4.5.1 A mot orc cle tyr e havin

a) a size an con t ru tion of

 nominal sect ion w idth, 12 mm,

 nominal asp ct rat io, 8 ,

 diagonal con t ru t ion, an

 nominal rim diamet er code 18, w it h

b) a serv ice des ription con ist in of

 a lo d-carr yin ca acity of 2 0 k , cor esp n in t o lo d in e “6 ”, an

 a max imum sp ed of 18 km/h, coresp n in t o sp ed s mb l “S”,

s al b marked:

4.5.2 A mot orc cle tyr e havin

a) a size an con t ru tion of

 nominal sect ion w idth, 14 mm,

 nominal asp ct rat io, 7 ,

 radial con t ru tion, an

 nominal rim diamet er code 17, w it h

b) a serv ice des ription con ist in of

 a referen e sp ed in ex ces of 2 0 k m/h (code le er “ZR” ,

 a referen e lo d-carr yin ca acity of 3 0 k , coresp n in to lo d in e “6 ”, an

4

I © SO – 10 2 A ll irt hg ers d v r 5

 a max imum sp ed of 2 0 km/h, coresp n in t o sp ed s mb l “W”,

s al b marked:

In t he case of “V R” an “VB” tyres a prov ed for sp ed in ex ces of 2 0 k m/h or “ZR” an “Z ” tyres a prov ed for

sp ed in ex ces of 2 0 km/h, t he serv ice des ription s al b marked in p rent heses

EXA MPLE 1 14 / 70 ZR 17 M/ C (6 W)

The act ual max imum sp ed cert ified by t he tyr e man fact urer may b marked on t he tyre

EXA MPLE 2 “V2 0” t o id nt ify a ma imum sp e of 2 0 k m/ h

5.1 Calc lat ion of design t yre dime sions

5.1.1 Th oretic l rim width, R

The t he retical r im width, R

th, s al b calc lat ed as folows:

is t he r im/sect ion rat io;

S is t he nominal section widt h

For tyres of ex ist in con e t s, K

1

s al b eq al t o

 0,6 for asp ct ratios 10 , 9 , 8 ,

 0,7 for asp ct ratios 7 , 6 , 6 , an

 0,8 for asp ct ratios 5 , 5

1

wi b d fin d lat er for asp c t rat ios b low 5

5.1.2 Me s rin rim width, R

The me s rin rim w idt h, R , is t he w idth of t he ex ist in rim ne rest t o R Se Ta le 1 for widt hs of ex istin rims

5.1.3 De ig tyre s ction widt h, S

The desig tyre sect ion w idt h, S, s al b t he nominal sect ion w idth, S , t ran fered fom R

S is t he nominal sec tion widt h;

H/S is t he nominal asp c t ratio

5.1.5 De ig tyre ov ral diameter, D

o

The desig tyre overal diamet er, D

o, s al b c alc lated as folows:

is t he nominal rim diamet er;

H is t he desig tyre section heig t

F r t hose tyres u in a nominal rim diameter code, se Ta le 1 for t he v alue of D

r

to b u ed

5.1.6 Valu s

Guidelne v alues for t he desig tyre dimen ion for met ric-series motorc cles are giv en in an e A

5.2 Max imum overal tyre dimensions in servic

5.2.1 Ge eral

The calc lation of 5.2.2 an 5.2.3 are for u e by v ehicle man fact urers in desig in for tyre cle ran es

5.2.2 Max ov ral width in s rvic , W

ma

The max imum overal widt h in ser vice, W

ma, s al b calc lat ed as folows:

W

ma

= S

where

S is t he desig tyre sec tion w idth;

a is t he a pro riat e co fic ient se Ta le 2)

It inc lu es protec t iv e ribs, lett erin , emb l s ment s, t re d overhan , man facturin t oleran es an growt h d e to

service

6

o,ma

= D

r+ 2Hb

w here

D

r

is t he nominal r im diamet er;

H is t he desig tyre section heig t ;

b is t he a pro riat e co ficient se Ta le 2)

It in lu es man fact urin t oleran es, growt h d e t o ser v ice, an deformat ion d e to cent rifu al force

5.3 Minimum dime sions — Se t ion width, S

in

The minimum sect ion w idth, S

min, s al b eq al to t he prod ct of t he desig tyre sect ion w idt h, S, an t he

a pro riate co ficien

5.4 Me suring tyre dime sions — Proc dure

Before me s rin , mou t t he tyr e on t he me s rin rim re d for tyre fit t in , inflat e t o t he recommen ed pres ure,

an alow to st an for a minimum of 2 h at normal ro m t emp rat ure, aft er whic re dju t he inflation pres ure t o

t he o ginal v alue

These at t ribution of t re d typ config ration t o the serv ice are to b con idered as ex amples only The c oice of

a giv en t re d typ config r at ion for a given tyre de en s on the tyre man fact urer alone

Fig re 1 s ows v ar i u t re d config rat ion :

 t re d typ A coresp n s to hig w ay ser v ice tyres man fact ured for sp ed s mb ls P, S an hig er;

 t re d typ B coresp n s t o hig way ser v ice tyres (for hig -p rorman e v ehicles) man fact ured for sp ed

8 © ISO– 10 2 Allr it hg r e e ev r

Fig re 1 — Tre d config ration

Table 2 — Coeficie t s for c lc lation of max imum ov ral tyre dime sions in s rvic

NOT Co fic ie ts for dia o al t y re are als a plc ble t o ty re in bia b lted c n truc t io

7 Tyre load- carrying capacity

7.1 Tyre lo d-carr yin ca acity (TLCC), coresp n in t o t he lo d in e (se Ta le 3), is a plca le for sp ed

up t o an in lu in 210 k m/h

8