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

BRITISH S TAND ARD AUTO MO BILE S E RIE S

BS AU
5 0 -1 . 6. 1 c: 2 0 0 2
ISO 5 75 1 -1 :2 0 0 1

Tyres and wheels —
Part 1 : Tyres —

S ection 6: Motorcycle tyre s —

Subsection 6. 1 c: Specification of
general requirements and design guide
for designations, dimensions and load
ratings for metric series tyres

I C S 83 . 1 6 0 . 1 0

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW


BS AU 50-1 .6.1 c:2002

National foreword
This B ritis h S tandard rep roduces verb atim IS O 5 751 - 1 : 2 00 1 and implements
it as the UK national s tandard. It s up ersedes BS AU 5 0 - 1 . 6. 1 b : 1 9 95 which is
withdrawn.

The UK p articip ation in its p rep aration was entrus ted to Technical C o mmittee
AUE /4 , Tyres and wheels for motor vehicles , which has the resp onsib ility to:

—

—

aid enquirers to unders tand the text;

p res ent to the res pons ib le international/E urop ean comm ittee any
enquiries on the interp retation, or p rop osals for change, and keep the
UK interests informe d;

—

monitor re lated international and E urop ean develop ments and
p rom ulgate them in the UK.

A list of organiz ations rep resented on this committee can b e ob tained on
reques t to its s ecretary.

C ross-references
The Britis h S tandards which imp lem ent international or E urop ean
p ub lications refe rred to in this document may b e found in the BS I S tandards
C atalogue under the s ection entitled “International S tandards C orresp ondence
Index”, or b y using the “Find” facility of the BS I S tandards E lectronic
C atalogue.

A Britis h Standard does not p urport to include all the necess ary p rovisions of
a contract. Us ers of British S tandards are resp onsib le for their correct
ap p lication.

Compliance with a British Standard does not of itself confer immunity

from legal obligations.

Summary of pages
This document comp ris es a front cover, an inside front cover, the IS O title p age,
p ages ii to iv, pages 1 to 1 4, an ins ide b ack cover and a b ack cover.

This Britis h S tandard, having
b ee n p rep ared under the

The BS I cop yright date dis p layed in this document indicates when the
document was las t iss ued.

direc tion of the E nginee ring
S ector P olicy and S trategy
C o mmittee, was p ub lis he d
under the authority of the

Amendments issued since publication

S tandards Polic y and S trategy
C o mmittee on 1 2 March 2 00 2

Amd. No.

© BS I 1 2 March 2 002

ISBN 0 5 80 391 1 6 7

D ate

C omments


BS AU 50−1.6.1c:2002

I SO

I N TE RN ATI ON AL
S TAN D ARD

5751 -1

Fi fth ed i ti on
2001 -1 2-1 5

M otorcycl e tyres an d ri m s (m etri c seri es) —
Part 1 :

Desi g n g u i d es
Pneumatiques et jantes pour motocycles (séries millimétriques) —
Partie 1: Guide de conception

Reference nu m ber
I SO 5751 -1 : 2001 (E)


BS AU 50−1.6.1c:2002

ii

BS IAU
50−1.6.1c:2002
SO 5751 -1 : 2001 (E)

Con ten ts

Pag e

Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i v
1

Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2

N orm ati ve referen ces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . 1

3

Term s an d d efi n i ti on s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . 1

4

Tyre desi g n ati on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

5

Tyre d i m en si on s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

6

Tread con fi g u rati on s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . 7

7

Tyre l oad -carryi n g capaci ty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . 8

8

Speed sym bol s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . 1 0

9

Cen tri fu g al rad i u s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1

An n ex A (i n form ati ve) G u i d el i n e val u es for m etri c seri es . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2
Bi bl i og raph y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4

iii


BS
AU 50−1.6.1c:2002
I SO 5751 -1 : 2001 (E)

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical

committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
The main task of technical committees is to prepare International Standards. Draft International Standards adopted
by the technical committees are circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO 5751 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 5751 -1 was prepared by Technical Committee ISO/TC 31 , Tyres, rims and valves, Subcommittee SC 1 0,
Cycle, moped, motorcycle tyres and rims.
This fifth edition cancels and replaces the fourth edition (ISO 5751 -1 :1 994), which has been technically revised.
ISO 5751 consists of the following parts, under the general title Motorcycle tyres and rims (metric series) :





Part 1 : Design guides
Part 2: Tyre dimensions and load-carrying capacities
Part 3: Range of approved rim contours

Annex A of this part of ISO 5751 is for information only.

iv


BS AU 50−1.6.1c:2002
I N TEN RATI ON ALTS AN D A DR

I S-1 575 O1 : (1 002)E

M otorcycl e tyres an d ri m s (m etri c seri es) —
Part 1 :

Desi g n g u i d es

1

Scope

Th i s part of I SO 5751 g i ves g u i d el i n es for th e d esi g n an d speci fi es th e d esi g n ati on , th e cal cu l ati on of d i m en si on s
an d th e l oad -carryi n g capaci ty of m etri c-seri es m otorcycl e tyres.

Th i s part of I SO 5751 i s appl i cabl e to m otorcycl e tyres wi th a red u ced h ei g h t/wi d th rati o (1 00 an d l ower) th at can
be fi tted on cyl i n d ri cal bead seat ri m s or 5° tapered bead seat ri m s. I t i s al so appl i cabl e to oth er con cepts of tyre
an d ri m , i n wh i ch case, h owever, th e appropri ate ri m /secti on rati os an d coeffi ci en ts wi l l h ave to be establ i sh ed .

N OTE

See I SO 4249 for requ i rem en ts coveri n g m otorcycl e tyres an d rim s (cod e-d esi gn ated seri es) of ri m d iam eter cod e

1 3 and above, and I SO 6054 for th ose of cod e 1 2 an d bel ow.

2

N orm ati ve referen ces

Th e fol l owi n g n orm ati ve d ocu m en ts con tai n provi si on s wh i ch , th rou g h referen ce i n th i s text, con sti tu te provi si on s of

th i s part of I SO 5751 . For d ated referen ces, su bseq u en t am en d m en ts to, or revi si on s of, an y of th ese pu bl i cati on s
d o n ot appl y. H owever, parti es to ag reem en ts based on th i s part of I SO 5751 are en cou rag ed to i n vesti g ate th e
possi bi l i ty

of

appl yi n g

th e

m ost

recen t

ed i ti on s

of

th e

n orm ati ve

d ocu m en ts

i n d i cated

bel ow.

For

u n d ated

referen ces, th e l atest ed i ti on of th e n orm ati ve d ocu m en t referred to appl i es. M em bers of I SO an d I EC m ai n tai n
reg i sters of cu rren tl y val i d I n tern ati on al Stan d ard s.
I SO 4000-2,

Passenger car tyres and rims — Part 2: Rims

I SO 42 23-1 ,

Definitions of some terms used in the tyre industry — Part 1: Pneumatic tyres

I SO 42 51 -3,

Tyres (ply rating marked series) and rims for agricultural tractors and machines — Part 3: Rims

3

Term s an d defi n i ti ons

For th e pu rposes of th i s part of I SO 5751 , th e term s an d d efi n i ti on s g i ven i n I SO 4223-1 appl y.

4

4. 1

Tyre d esi g n ati on

G en eral

Th e d esi g n ati on of th e tyre sh al l be sh own on i ts si d ewal l an d sh al l i n cl u d e th e fol l owi n g m arki n g s, pl aced cl ose to
each oth er:




si ze an d con stru cti on (see 4. 2);
servi ce d escri pti on (see 4. 3).

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I S-1 575 O1 : (1 002)E

4. 2

Si ze an d con stru cti on

4. 2. 1

Ch aracteri sti cs

Th e si ze an d con stru cti on ch aracteri sti cs sh al l be i n d i cated as fol l ows:

N om i n al
secti on
wi d th

4. 2. 2

§

N om i n al

Tyre

N om i n al

aspect

con stru ction

ri m d i ameter

rati o

cod e

cod e

N om i n al secti on wi d th

Th e n om i n al secti on wi d th sh al l be expressed i n m i l l i m etres.

4. 2. 3

N om i n al aspect rati o

Th e n om i n al aspect rati o sh al l be expressed as a percen tag e. I t sh al l be a m u l ti pl e of 1 0 for aspect rati os 70 an d
h i g h er, an d a m u l ti pl e of 5 for aspect rati os l ower th an 70.

4. 2. 4

Tyre con stru cti on cod e

Th e tyre con stru cti on cod e sh al l be





“B” for bi as bel ted type con stru cti on s,

“-” for d i ag on al pl y tyres, an d

“R” for rad i al pl y tyres.

N OTE 1

See al so 4. 4. 3. Oth er cod es wil l be establ i sh ed for n ew con cepts (construction s) of tyres.

N OTE 2

Th e term “bi as bel ted con structi on ” d escri bes a pn eu m ati c tyre stru ctu re of d i ag on al (bi as pl y) type i n wh i ch the

carcass is restricted by a su bstan tial l y i nexten si bl e ci rcu m feren ti al bel t

N OTE 3

With referen ce to th e d efi ni ti on of rad ial pl y tyre g i ven i n I SO 4223-1 , for th e pu rposes of thi s part of I SO 5751 ,

“su bstan ti al l y at 90° ” m eans an g l es between 70° an d 90° as m easu red from the cen trel i n e of th e tread .

4. 2. 5

N om i n al ri m d i am eter

Th e n om i n al ri m d i am eter sh al l n orm al l y be expressed by a cod e (see Tabl e 1 ). H owever, i t sh al l be expres sed i n
m i l l i m etres for n ew an d fu tu re con cepts wh ere th e appl i cati on ei th er of exi sti n g tyres on n ew-con cept ri m s or of
n ew-con cept tyres on exi sti n g ri m s wou l d be i n com pati bl e.

4. 3

Servi ce d escri pti on

Th e ch aracteri sti cs sh al l be i n d i cated as fol l ows:

Load i nd ex

Speed s ym bol

Th e l oad i n d ex i s a n u m eri cal cod e associ ated wi th th e m axim u m l oad a tyre can carry at th e speed i n d i cated by i ts
speed s ym bol u n d er th e con d i ti on s speci fi ed i n cl au se 7 (see Tabl e 3).

Th e speed s ym bol i n d i cates th e speed categ ory i n wh i ch th e tyre can carry th e l oad correspon d i n g to i ts l oad i n d ex
u n d er th e servi ce con d i ti on s speci fi ed i n cl au se 7 (see Tabl e 4).

2

2

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S-1 575 O1 : (1 002)E

Tabl e 1 — N om i n al ri m d i am eter an d ri m wi d th cod es
Di m ensi on s i n m i l l i m etres

N om i n al rim d i am eter cod e
Cod e

4. 4

N om i n al rim d i am eter

D

Ri m wi d th code
Cod e

M easu ri n g ri m wid th

R

r

m

8

203

1 . 50

38

10

254

1 . 60

40, 5

12

305

1 . 85

47

1 3 M/C

330

2. 1 5

55

1 4 M/C

356

2. 50

63, 5

1 5 M/C

381

2. 75

70

1 6 M/C

406

3. 00

76

1 7 M/C

432

3. 50

89

1 8 M/C

457

3. 75

95

1 9 M/C

483

4. 00

1 01 , 5

20 M/C

508

4. 50

1 1 4, 5

21 M/C

533

5. 00

1 27

23 M/C

584

5. 50

1 39, 5

6. 00

1 52, 5

6. 25

1 59

6. 50

1 65

7. 00

1 78

Oth er servi ce ch aracteri sti cs

4. 4. 1

I n th e case of tu bel ess tyres, th e m arki n g “TU BELESS ” sh al l be sh own on th e tyre.

4. 4. 2

I n th e case of a preferred d i recti on of rotati on of th e tyre, an arrow sh al l be u sed to i n d i cate th at d i recti on .

4. 4. 3

Tyres d esi g n ed for veh i cl es h avi n g a m axim u m speed capaci ty i n excess of 240 km /h sh al l be i d en ti fi ed by

m ean s of th e cod e l etters




“VB” or “ZB” for bi as-bel ted con stru cti on ,

“VR” or “ZR” for rad i al con stru cti on ,

wh ere “ZB” an d “ZR” sh ou l d be u sed for n ewl y d esi g n ed m otorcycl es wi th a m axi m u m speed over 2 40 km /h .

Th i s i d en ti fi cati on sh al l be pl aced i n si d e th e tyre d es i g n ati on (see 4. 2) i n stead of i n th e tyre con stru cti on cod e.

For speed categ ory “V”, “VB” or “VR” tyres su i tabl e for speed s of over 240 km /h , a servi ce d escri pti on wi th th e
speed s ym bol “V” sh al l be m arked i n paren th eses.

EXAM PLE 1

1 20/60 VR 1 7 (55 V)

For speed categ ory “ZB” or “ZR” tyres su i tabl e for speed s u p to 2 70 km /h , a servi ce d escri pti on wi th th e speed
s ym bol “W” sh al l be m arked .
EXAM PLE 2

1 20/60 ZR 1 7 55 W

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I S-1 575 O1 : (1 002)E

I f th e sam e tyres are su i tabl e for speed s of over 270 km /h , th e servi ce d escri pti on sh al l be m arked i n paren th eses.

EXAM PLE 3

4. 4. 4

1 20/60 ZR 1 7 (55 W)

For n om i n al ri m d i am eter cod es 1 3 an d above, th e su ffi x “M /C” sh al l be ad d ed to th e si ze an d con stru cti on

m arki n g , to preven t con fu si on an d m i sfi tti n g of m otorcycl e tyres on ri m s h avi n g th e sam e n om i n al d i am eters bu t
d esi g n ed pri m ari l y for passen g er car tyres i n accord an ce wi th I SO 4000-2 or ag ri cu l tu ral tyres i n accord an ce wi th
I SO 42 51 -3.

4. 4. 5

Th e m axim um speed approved b y th e tyre m an u factu rer m ay be m arked on th e tyre.

E XAM PLE

“V250” to i d en ti fy a m axi m u m speed of 250 km /h .

4. 4. 6

Th e sym bol “M ST” m ay be u sed to i d en ti fy speci al servi ce tyres.

4. 4. 7

Th e sym bol “DP” m ay be u sed to i d en ti fy tread type C tyres.

4. 5

Exampl es

4. 5. 1

a)

a si ze an d con stru cti on of





b)

A m otorcycl e tyre h avi n g

n om i n al secti on wi d th , 1 20 m m ,
n om i n al aspect rati o, 80,
d i ag on al con stru cti on , an d
n om i n al ri m d i am eter cod e 1 8, wi th

a servi ce d escri pti on con si sti n g of




a l oad -carryi n g capaci ty of 290 kg , correspon d i n g to l oad i n d ex “65”, an d
a m axim um speed of 1 80 km /h , correspon d i n g to speed sym bol “S”,

sh al l be m arked :

4. 5. 2

a)

a si ze an d con stru cti on of





b)

4

n om i n al secti on wi d th , 1 40 m m ,
n om i n al aspect rati o, 70,
rad i al con stru cti on , an d
n om i n al ri m d i am eter cod e 1 7, wi th

a servi ce d escri pti on con si sti n g of



4

A m otorcycl e tyre h avi n g

a referen ce speed i n exces s of 240 km /h (cod e l etter “ZR”),
a referen ce l oad -carryi n g capaci ty of 300 kg , correspon d i n g to l oad i n d ex “66”, an d

© I SO 1 002 – Al l ir th g ser sed evr


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S-1 575 O1 : (1 002)E



a m axim um speed of 270 km /h , correspon d i n g to speed sym bol “W”,

sh al l be m arked :

I n th e case of “VR” an d “VB” tyres approved for speed s i n excess of 240 km /h or “ZR” an d “ZB” tyres approved for
speed s i n excess of 270 km /h , th e servi ce d escri pti on sh al l be m arked i n paren th eses.

EXAM PLE 1

1 40/70 ZR 1 7 M/C (66 W)

Th e actu al m axi m um speed certi fi ed by th e tyre m an u factu rer m ay be m arked on th e tyre.

E XAM PLE 2

5

“V280” to i d en ti fy a m axi m um speed of 280 km /h .

Tyre d i m en si on s

5. 1

Cal cu l ati on of d esi g n tyre d i men si on s

5. 1 . 1

R

Th eoreti cal ri m wi d th ,

Th e th eoreti cal ri m wi d th ,

R

th

=

KS
1

R

th

th

, sh al l be cal cu l ated as fol l ows:

N

wh ere

K

i s th e ri m /secti on rati o;

S

i s th e n om i n al secti on wi d th .

1

N

For tyres of exi sti n g con cepts,





sh al l be eq u al to

0, 7 for aspect rati os 70, 65, 60, an d

0, 8 for aspect rati os 55, 50.

K

1

wi l l be d efi n ed l ater for aspect rati os bel ow 50.

M easu ri n g ri m wi d th ,

R

Th e m easu ri n g ri m wi d th ,

5. 1 . 3

1

0, 6 for aspect rati os 1 00, 90, 80,

N OTE

5. 1 . 2

K

m

R

m

, i s th e wi d th of th e exi sti n g ri m n earest to

Desi g n tyre secti on wi d th ,

Th e d esi g n tyre secti on wi d th ,

S,

R

th

. See Tabl e 1 for wi d th s of exi sti n g ri m s.

S

sh al l be th e n om i n al secti on wi d th ,

S

N

, tran sferred from

R

th

to

R

m

, cal cu l ated as

fol l ows:

S=S

N

+

K (R
2

m

-

R

th

)

rou n d ed to th e n earest wh ol e n u m ber.

I ©S O – 1 002 Al l irth gs ersed evr

5

5


BS
AU 50−1.6.1c:2002
I S-1 575 O1 : (1 002)E

For tyres of exi sti n g con cepts,

5. 1 . 4

K

2

= 0, 4 .

Desi g n tyre secti on h ei g h t,

Th e d esi g n tyre secti on h ei g h t,

H=S

H
N

H

H, sh al l be cal cu l ated as fol l ows:

S

1 00

rou n d ed to th e n earest wh ol e n u m ber,

wh ere

S

i s th e n om i n al secti on wi d th ;

N

HS
/

5. 1 . 5

i s th e n om i n al aspect rati o.

Desi g n tyre overal l d i am eter,

Th e d esi g n tyre overal l d i am eter,

D

o

=

D

r

D

o

D

o

, sh al l be cal cu l ated as fol l ows:

+ 2H

wh ere

D

i s th e n om i n al ri m d i am eter;

r

H

i s th e d esi g n tyre secti on h ei g h t.

For th ose tyres u si n g a n om i n al ri m d i am eter cod e, see Tabl e 1 for th e val u e of

5. 1 . 6

D

r

to be u sed .

Val u es

G u i d el i n e val u es for th e d esi g n tyre d i m en si on s for m etri c-seri es m otorcycl es are g i ven i n an n ex A.

5. 2

M axi m u m overal l tyre d i m en si on s i n servi ce

5. 2. 1

G en eral

Th e cal cu l ati on s of 5. 2. 2 an d 5. 2. 3 are for u se b y veh i cl e m an u factu rers i n d esi g n i n g for tyre cl earan ces.

M ax. overal l wi d th i n servi ce,

W

Th e m axim um overal l wi d th i n servi ce,

W

5. 2. 2

W

m ax

=

m ax

, sh al l be cal cu l ated as fol l ows:

m ax

Sa

wh ere

S

i s th e d esi g n tyre secti on wi d th ;

a

i s th e appropri ate coeffi ci en t (see Tabl e 2).

I t i n cl u d es protecti ve ri bs, l etteri n g , em bel l i sh m en ts, tread overh an g , m an u factu ri n g tol eran ces an d g rowth d u e to
servi ce.

6

6

© I SO 1 002 – Al l ir th g ser sed evr


BS IAU
50−1.6.1c:2002
S-1 575 O1 : (1 002)E

M ax. overal l d i ameter i n servi ce,

D

Th e m axim u m overal l d i am eter i n servi ce,

D

5. 2. 3

D

o, m ax

=

D

r

+ 2

o, m ax

, sh al l be cal cu l ated as fol l ows:

o, m ax

Hb

wh ere

D

i s th e n om i n al ri m d i am eter;

r

H

i s th e d esi g n tyre secti on h ei g h t;

b

i s th e appropri ate coeffi ci en t (see Tabl e 2).

I t i n cl u d es m an u factu ri n g tol eran ces, g rowth d u e to servi ce, an d d eform ati on d u e to cen tri fu g al force.

5. 3

M i ni mum di men si on s — Secti on wi d th,

Th e m i n i m um secti on wi d th ,

S

min

,

S

min

sh al l be eq u al to th e prod u ct of th e d esi g n tyre secti on

wi d th ,

S,

an d th e

appropri ate coeffi ci en t:

S

min

S−S

m in

5. 4

= 0, 96

S

sh al l be at l east 4 m m .

M easu ri n g tyre d i men si on s — Proced u re

Before m easu ri n g , m ou n t th e tyre on th e m easu ri n g ri m read y for tyre fi tti n g , i n fl ate to th e recom m en d ed pressu re,
an d al l ow to stan d for a m i n i m um of 24 h at n orm al room tem peratu re, after wh i ch read j u st th e i n fl ati on pressu re to
th e ori g i n al val u e.

6

Tread con fi g u rati on s

Th ese attri bu ti on s of tread type con fi g u rati on s to th e servi ce are to be con si d ered as exam pl es on l y. Th e ch oi ce of
a g i ven tread type con fi g u rati on for a g i ven tyre d epen d s on th e tyre m an u factu rer al on e.

Fi g u re 1 sh ows vari ou s tread con fi g u rati on s:



tread type A correspon d s to h i g h way servi ce tyres m an u factu red for speed sym bol s P, S an d h i g h er;



tread type B correspon d s to h i g h wa y servi ce tyres (for h i g h -perform an ce veh i cl es) m an u factu red for speed
sym bol s S an d h i g h er;



tread type C correspon d s to tyres for on - an d off-road servi ce m an u factu red for speed sym bol s u p to an d
i n cl u d i n g H ;



tread type D correspon d s to tyres for excl u si ve off-road servi ce m an u factu red for speed s ym bol M .

I ©S O – 1 002 Al l irth gs ersed evr

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7


BS
AU 50−1.6.1c:2002
I S-1 575 O1 : (1 002)E

Fi g u re 1 — Tread con fi g u rati on s

Tabl e 2 — Coeffi ci en ts for cal cu l ati on of m axi mu m overal l tyre d i m en si on s i n servi ce
Coeffi ci en t

Tread con fi g u ration

N OTE
a

b

c

7
7. 1

a

b

Type A

1 ,1

a

1 , 07

b

Type B

1 ,1

a

1 , 07

b

Type C

1 ,1

a

1 ,1 2

c

Type D

1 , 25

1 ,1 2

c

Coeffi ci en ts for d i ag on al tyres are al so appl icabl e to tyres i n bi as belted con stru cti on .

1 , 08 for tyres on rim d i am eter code 1 2 an d bel ow an d 1 , 07 for rad i al tyres.
Su bj ect to th e con d iti on th at

D

o, m ax

− Do i s

at l east 6 m m .

Su bj ect to th e con d iti on th at

D

o, m ax

− Do i s

at l east 8 m m .

Tyre l oad -carryi n g capaci ty
Tyre l oad -carryi n g capaci ty (TLCC), correspon d i n g to th e l oad i n d ex (see Tabl e 3), i s appl i cabl e for speed s

u p to an d i n cl u d i n g 2 1 0 km /h .

8

8

© I SO– 1 002

Al l r i th g sr esed evr

BS IAU
50−1.6.1c:2002
S-1 575 O1 : (1 002)E

Tabl e 3 — Correl ati on between l oad i n d ex (LI ) an d tyre l oad -carryi n g capaci ty (TLCC)
LI

0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

22
23
24
25
26
27
28
29

TLCC

kg
45
46,2
47,5
48,7
50
51 ,5
53
54,5
56
58
60
61 ,5
63
65
67
69
71
73

75
77,5
80
82,5
85
87,5
90
92,5
95
97,5
1 00
1 03

LI

30
31
32
33
34
35
36
37
38
39
40
41
42
43
44

45
46
47
48
49
50
51
52
53
54
55
56
57
58
59

TLCC

kg
1 06
1 09
112
115
118
1 21
1 25
1 28
1 32
1 36
1 40

1 45
1 50
1 55
1 60
1 65
1 70
1 75
1 80
1 85
1 90
1 95
200
206
21 2
21 8
224
230
236
243

LI

60
61
62
63
64
65
66
67

68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89

TLCC

kg
250
257
265
272

280
290
300
307
31 5
325
335
345
355
365
375
387
400
41 2
425
437
450
462
475
487
500
51 5
530
545
560
580

For speed symbol “V”, between 21 0 km/h and 240 km/h, the load-carrying capacity shall be reduced with
respect to the value corresponding to the load index as follows:
 up to 21 0 km/h: 1 00 % load

 220 km/h max.: 95 % load;
 230 km/h max: 90 % load;
 240 km/h max: 85 % load.

7. 2

I ©SO – 1 002 All irthgs ersedevr

9

9


BS
AU 50−1.6.1c:2002
I S-1 575 O1 : (1 002)E

Between these speeds, linear interpolation is permitted.
For “VB” and “VR” tyres, the load-carrying capacity above 240 km/h shall be further reduced by 5 % for each
1 0 km/h increase in speed.
For “ZR” tyres, the load-carrying capacity is applicable for speeds up to and including 240 km/h. The loadcarrying capacity above 240 km/h shall be reduced as follows:
 250 km/h: 95 % load;
 260 km/h: 85 % load;
 270 km/h: 75 % load.
For speeds over 270 km/h, consult the tyre manufacturer concerned.
7. 3

7. 4

8

Speed sym bol s

Speed symbols shall be as given in Table 4.
Tabl e 4 — Correl ati on between speed sym bol s an d speed categ ori es

Speed s ym bol

J
K
L
M
N
P
Q
R
S
T
H
V
W
a

Speed categ ory

km/h
1 00
110
1 20
1 30

1 40
1 50
1 60
1 70
1 80
1 90
21 0
240 a
270b

Tyres designed for operations at speeds in excess of 240 km/h
shall be identified according to 4.4.3, Example 1 . For the maximum
speed capability, consult the tyre manufacturer.
b Tyres designed for operations at speeds in excess of 270 km/h
shall be identified according to 4.3.3, Example 3. For the maximum
speed capability, consult the tyre manufacturer.

101 0

© ISO 1 002 – Allir thgser sedevr


BS IAU
50−1.6.1c:2002
S-1 575 O1 : (1 002)E

9

Cen tri fu g al rad i u s

Th e m axim u m cen tri fu g al rad i u s,

R

d yn

, cau sed b y cen tri fu g al force, i s rel ated to th e m axim u m speed of th e veh i cl e,

an d sh al l be cal cu l ated as fol l ows:

R

d yn

= 0, 5 D r + H ¥ c

wh ere

D

r

i s th e n om i n al ri m d i am eter;

H

i s th e d esi g n tyre secti on h ei g h t;

c

i s th e appropri ate coeffi ci en t (see Tabl e 5).

For veh i cl es h avi n g m axi m u m speed s i n excess of 240 km /h , con su l t th e tyre m an u factu rer.

Tabl e 5 — Coeffi ci en ts for cal cu l ati on of m axi mu m cen tri fu g al rad i u s at vari ou s m axi mu m d ri vi n g speed s
Coeffi ci en t
Tread con fi g u ration
U p to 1 50 km /h

c

U p to 1 80 km /h

U p to 21 0 km /h

U p to 240 km /h

Types A an d B

1 , 07

a

1 ,1 0

1 ,1 3

1 ,1 6

Types C an d D

1 ,1 2

b

1 ,1 5

1 ,1 8

—

a

b

Su bj ect to th e con d iti on th at

Hc − H i s at l east 3 m m .

Su bj ect to th e con d iti on th at

Hc − H i s at l east 4 m m .

I ©S O – 1 002 Al l irth gs ersed evr

1 111


BS
AU 50−1.6.1c:2002

I S-1 575 O1 : (1 002)E

An n ex A
(i n form ati ve)

G u i del i n e val u es for m etri c seri es

G u i d el i n e val u es are g i ven for tyre d i m en si on s i n Tabl es A. 1 an d A. 2.

Tabl e A. 1 — G u i d el i n e val u es
Dim en si ons i n m il l im etres

Aspect rati os 1 00, 90, 80:
Ri m /secti on rati o

K

1

As pect rati os 70, 65, 60:
Ri m /secti on rati o

= 0, 6

K

1

As pect rati os 55, 50:
Ri m/secti on rati o

= 0, 7

K

1

= 0, 8

N om in al

Th eoreti cal

M easuri ng

Desi g n

Th eoreti cal

M easuri ng

Desi g n

Th eoreti cal

M easuri ng

Desi gn

secti on

ri m wid th

ri m wid th

secti on

ri m wid th

ri m width

secti on

ri m wid th

ri m wid th

secti on

code

wi d th

cod e

wi d th

code

wi d th

wi d th

S

R

60

121 2

R

R

R

S

R

R

S

m

S

36

1 .5

61

42

1 .6

59

—

—

—

70

42

1 .6

69

49

1 . 85

69

—

—

—

80

48

1 . 85

80

56

2. 1 5

80

—

—

—

90

54

2. 1 5

90

63

2. 50

90

—

—

—

1 00

60

2. 50

1 01

70

2. 75

1 00

—

—

—

110

66

2. 50

1 09

77

3. 00

110

—

—

—

1 20

72

2. 75

119

84

3. 50

1 22

—

—

—

1 30

78

3. 00

1 29

91

3. 50

1 29

1 04

4. 00

1 29

1 40

84

3. 50

1 42

98

4. 00

1 41

112

4. 50

1 41

1 50

90

3. 50

1 50

1 05

4. 00

1 49

1 20

4. 50

1 48

1 60

96

4. 00

1 62

112

4. 50

1 61

1 28

5. 00

1 60

1 70

1 02

4. 00

1 70

119

4. 50

1 68

1 36

5. 50

1 71

1 80

1 08

4. 50

1 83

1 26

5. 00

1 80

1 44

5. 50

1 78

1 90

—

—

—

1 33

5. 00

1 88

1 52

6. 00

1 90

200

—

—

—

1 40

5. 50

200

1 60

6. 25

200

N

th

th

m

th

m

© I SO 1 002 – Al l ir th g ser sed evr


BS IAU
50−1.6.1c:2002
S-1 575 O1 : (1 002)E

Tabl e A. 2 — G u i d el i n e val u es

Dimensions in millimetres
Desi g n secti on h ei gh t
N om i n al
secti on
wi d th

SN

60
70
80
90

1 00
110
1 20
1 30
1 40
1 50
1 60
1 70
1 80
1 90
200

H
H S (%)

at vari ou s n omi n al aspect rati os
/

1 00
60
70
80
90
1 00
110
1 20
1 30
1 40
1 50
1 60

1 70
1 80
—
—

I ©SO – 1 002 All irthgs ersedevr

90
54
63
72
81
90
99
1 08
117
1 26
1 35
1 44
1 53
1 65
—
—

80
—
56
64
72
80

88
96
1 04
112
1 20
1 28
1 36
1 44
—
—

70
—
—
56
63
70
77
84
91
98
1 05
112
119
1 26
—
—

65
—

—
—
—
65
72
78
85
91
98
1 04
111
117
1 24
1 30

60
—
—
54
60
66
72
78
84
90
96
1 02
1 08
—
—

55
—
—
—
—
—
—
—
72
77
83
88
94
99
1 05
110

50
—
—
—
—
50
55
60
—
—
—
80

85
90
95
1 00

1 313


BS
AU 50−1.6.1c:2002
I S-1 575 O1 : (1 002)E

Bi bl i og raph y

[1 ]

I S O 4 2 4 9 -1 ,

Motorcycle tyres and rims (Code designated series) — Part 1: Tyres

[2 ]

I S O 4 2 4 9 -2 ,

Motorcycle tyres and rims (Code-designated series) — Part 2: Tyre load ratings

[3 ]

I S O 4 2 4 9 -3 ,

Motorcycle tyres and rims (code-designated series) — Part 3: Rims

[4 ]

I S O 5 7 51 -2 ,

Motorcycle tyres and rims (metric series) — Part 2: Tyre dimensions and load-carrying

capacities
[5 ]

[6 ]

I S O 5 7 51 -3 ,

I S O 6 0 54 -1 ,

Motorcycle tyres and rims (metric series) — Part 3: Range of approved rim contours
Motorcycle tyres and rims (Code-designated series) — Diameter codes 4 to 12 — Part 1:

Tyres
[7 ]

141 4

I S O 6 0 54 -2 ,

Motorcycle tyres and rims (Code-designated series) — Diameter codes 4 to 12 — Part 2: Rims

© I S O 1 0 0 2 – Al l i r th g s er s ed evr