≠ EDICT OF GOVERNMENT ±

JAPAN

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The citizens of a nation must honor the laws of the land.

Fukuzawa Yukichi

JIS K 6302 (2011) (English): Cycles -- Tyres

JIS K 6302: 2011 (JBPI/]SA)

Cycles - Tyres

res 43.150;83.160.10 Reference number: JIS K 6302 : 2011 (E)

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JAPANESE INDUSTRIAL STANDARD

Translated and Published by

Japanese Standards Association

14 S

K 6302: 2011

Date of Establishment: 1950-03-31

Date of Revision: 2011-03-22

Date of Public Notice in Official Gazette: 2011-03-22

JSA 2012

by: Japanese Industrial Standards ConUl1ittee

Standards Board

Technical Committee on Consluner Products

JIS K 6302 : 2011, First edition H~II"'n"Jfl in 2012-09

Translated and Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN

In the event of any doubts arising as to the contents, the original JIS is to be the final authority.

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher.

Printed in Japan HT/HN

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K 6302: 2011

Contents

Illtl'oductioil .................................................. ············································1

1 Scope ...................................................... ··········································1

2 Nornlative ,,·n.i-... C,l".j" "'U\"''lA.J ••••••••••••••••••••••••••••••• " •••••••••••••••••••••••••••••••••••••••••• 1

3 Terms and defillitions .......................................................................... 2

4 Classification············································· .................................. ·····3

5 DilllellsiollS······················································································ 4

6 dimellsions ................................................................................. 7

6.1 ovarall \vidth ...................................................................... ·······7 6.2 Tyre overall diameter ....... ....... ........ ...... ......... ........... . .................. ····7

6.3 1\ieaSUl'elnent of tyre dill1ensions in service·············································· 7

7 Qllality········· .................................................................................. 7 7 1 Al)pearance' ............................................................................ ········7 7.2 PerfOl'111ance" ................................................................................... 8

8 Test l11ethod ................................................................................. ····9

8.1 Tread rubber tensile test .. ·· .. ·· ...... · .. · .. ·· .. · .. ··· .. ··· .. ·· .. ······· .. · .. ···· .. · .. · .. ···9 8.2 Bead rubber test ........................ ············································9 8.3 Bead wire tensile test ......................................................................... 9

8.4 Carcass cloth tensile test ............ , ......................................... ·············10 8.5 test ................................................................................ ·····11

8.6 test ................................................... ·······························12

8.7 Water pressure test for riln running-off resistance ................................ · .. 12 8.8 Running durability test ................................................................... ··18 8.9 Sidewalll'ubber ozoning test ............................................................. ·13

9 Designation of products .................................................................... ·13

10 l\r1al'king···· ................................................................................... "14

Annex JA (informative) COlllpal'ison table between JIS and corresponding International Standard" ........................................ ·15

(i)

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K 6302: 2011

Fore"\vord

This translation has been made based on the original trial Standard revised by the lVIinister of EcoH01ny, Trade and Industry through deliberations at the Japanese Industrial Standards Committee as the result of proposal for revision of Japanese Industrial Standard sub111itted by Japan Bicycle Promotion Institute (JBPI)I (Japanese Stan-dards Association (JSA) with the draft attached, based on the pro· vision of Article 12 Clause 1 of the Industrial Standardization Law ap-plicable to the case of revision the provision Article 14.

Consequently, JIS K 6302:2008 is repJaced with this Standard, and JIS D 9112:1991 has been withdrawn and replaced with this Standard.

This JIB document is protected the Copyright Law.

Attention is drawn to the possibility that some parts of this Standard may conflict with a patent application fOl' a patent after opening to the public or utility model right. The relevant Minister and the Japanese Industrial Standards Comnlittee are not responsible for iden-T,'M:T1ncr the patent right, application for a patent after opening to the

public or the utility model

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INDUSTRIAL STANDARD JIS K 6302 : 2011

Cycles Tyres

Introduction

This Japanese Industrial Standard has been l"\l'·':. .. .,.':. .. ·c.rl based on the fifth edition of

ISO 5775-1 published in 1997 by lllodifying some reflect the actual situation in Japan.

the technical contents in ordor to

The portions sidelines or dotted underlines are the matters in which the con-tents of the corresponding International Standard have been modified. A list of modi-fications with the explanations is given in Annex JA.

1 Scope

This Standard specifies the pneumatic tyres for bicycles .E2D~.G~XtQg.jn._eU_S __ p.J~l!J (hereafter referred to as "bicycle tyres~')

Ot~x~~ft~~:.x~f~xx~~1 .. tQ __ ~_S}._~'.d?1i:v~J-:y. .. hi~y.~!~ __ tYX~(()_~ It (round .Qxj;.!!Q~l~§~LtYrf?§!

Bicycle tyres and bicycle are referred to as "tyres".

NOTE: The International Standard corresponding to this Standard and the symbol of degree of correspondence is as follows.

ISO 5775-1 : 1997 Bic;rcle and dil11ellsiolls (!\tIOD)

a11d 1'11.11S - Pal't 1 : Ty-l'e desigIla tions

In addition, sYlnbols which denote the of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), I\10D (modified), and NEQ (not equivalent) according to ISOIIEC Guide 21-1.

2 Normative references

The following standards contain provisions which, through in this constitute provisions of this Standard. The most recent editions of the standards (in-'-'-'- ..... u--'-.u,~ amendnlents) indicated below shall be CUJU.L!..'LLL

JIS D 9421 Bic;rcles Ril11S

NOTE: Corresponding International Standard: ISO 5775-2 : 1996 lind ril11s Part 2: Rims and Amendment 1 : 2001 (l\10D)

.JJ~J~J)_~_~.Q ___ JJy-'9.p.fr( ____ ._gt?1Jf!r?lp!:J?9.fJ.d!!!X!$._tQ!.'Rtt;'Rf!ti!l.g:Al!7.c1.f.Q!J.dl~:i9.!!iIlg_t.t?$t pif![!~$._fQ!.'Rby§..k_!J.lt.?_$.t;_mfL~1.g!{!fi

JJ~.K_G.~.~J __ .E_l!b.b.?!~ __ Y.!!Jq!Jl~j~~dQ!:.tb.f:..tJ.1A9P!f!/!lj9.$. _____ l)t?tf!lT!!il~?:MQ?~_Q[tf!!!!~jJf?_

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types

2 K 6802: 2011

3 Terms and definitions

For the purpose of this Standard, the following tel'IllS and definitions apply.

3.1 tyre size designation

designation of the tyre size indicated as ~~(nQXlliggtJ;Y~~I? __ ~::rY~J.:~'!JLrljJ:ln1~tl?xt~ ___ (~1Qmln~J tYX~_wiclthtJ)x_~:(nOlninal tyre width) (nominal rim diameter)"

3.2 applicable rim

a rim suitable for a particular tYl'e, capable of effectively fulfilling the tyre performance

JIS D 9421 shall be referred to for classification, types and nominal size of applicable rims.

3.3 design dimensions

basic dimensions in the design of a tyre

It generically refers to the tyre overall width and tyre overall diameter (see table 1 to table 3).

3.4 tyre overall width

the maximum width of a tyre mounted on an applicable rim, inflated to the standard inflation pressure, and under no-load condition1) (see figure 1 to figure 4)

NOTE:

Note l)

The tyre width is defined as the linear distance between the sidewalls of the tyre excluding the Inoulded patterns and letters that are included in the tyre overall width.

In this condition, the tyre is not resting on the ground.

3.5 tyre overall diameter

the overall diameter of a tyre mounted on an applicable rim, inflated to the standard

inflation air pressure, and under no-load condition!) 1 to figure 4)

3.6 marked inflation pressure

the nlarking of the inflation pressure given on the tyre at which the tyre performance can be effectively fulfilled

3.7 standard inflation pressure

the inflation pressure at which the tyre performance can be effectively fulfilled

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3.8 maximum inflation pressure

the maximulll value of inflation pressure at which the tively fulfilled

3.9 recommended inflation pressure range

3 K 6302: 2011

pe:t·torrrlarlce can be effec-

the range of inflation pressure in which the tYl'e -no·l·l·r,.~~ .... ':"'"'1~

4 K 6302 : 2011

NQtE?_i? ___ ~) _______ A91n:E?_y.igt.i9_n_JQ~: __ ~'}YiXQ~ __ QD-::~_J~_.th

I 'I'yre design a-

tion

16x13/8 (37-349)

18x13/8 (37-40)

20xPh~

(:)7-451)

22x1 1/4 (32-501)

22>

6 K 6302: 2011

2 HE tyre

TYl'e size ApplicabJe rim Design dimensions Standard Maximum

designa- I Nominal Type Tyre overall TYl'e overall inflation load tion I SIze width diameter

pressure h"llass) I mm mm kPa kg I

12.5x2.25 I

121hx2 1/4 HE-} or HB 57 320 250 40 I I

or 121/2X21/4

14x1.50 14xL75 40 :340

14x1.50 I . HE-50rHB 38 14x1.75 14x1.75 HE-lor HB 45 349 45

~ HE'5~ 43

IGx 1.50 lGx 1. , HE-l 40 391 50 HE-5 or" " 38

l6x1.75 16x1.75 HE-lol'HB 45 400 50 1(}xL50 HE-50rHB 43

I l8x1.50 18x1.75 HE-! orHB 40 ~141 55

~50t'HB 38 18x1.75 18x1.7 -lor HB 45 450 60

18xl.50 -501' HB 43 20X1.50 20xl.75 HE-1ol'HB 40 492

20x1.50 HE-50rHB 38 20Xl.75 20x1.75 HE-lor HB 45 501 65

20x1.50 HE-50rHB 4.3 20x2.l25 20xL75 HE-lor HB 54 517 70

22x1.75 22xL75 45 552

22xL50 HE-50rHB 43 24x1.50 24x1.75 HE-lorHB 40 594 75 24x1.75 45 603 80 26x1.50 26xL75 40 645 26x1.75 45 654 85

2Gx2.125 54 674 90 NOTE: In the case of using HB I'lm as the applicable rim .. the nominal width of the rim shall be

equal to or appl'oximate to the specified rim width of HE rim.

Table 3 BE tyre

Applicable rim Design dimensions Standard Maximum Tyl'e size Nominal Classification or Tyr80vemU Tyre overall inflation load

designa tion size type width diameter pressure (mass)

mm mm kPa kg 26xP/8 26x 13/8 BE-I 39 668 300 70 26xPJ4 26xP/4 46 685 100

I 26xJ3/4 4PR 110 26x2 26x2 BE 52 698 130 26x2 4PR 350 150 26x211z 26x21h BE 70 700 300 18°1 26x21h 4PR 350 210

3 ·tPR 26x3 80 687 300 250

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7 K 6302: 2011

6 dimensions

6.1 overall width

The overall width in service shall be measured according to and the meas-ured wiclth shall not be tYl'e overall width specified in the

diinension -"- .. ::."'.·".-::,-:c •• -:: •• ,;", •• ::."-,."::,.-:::-.. ",,.

6.2 Tyre overall diameter

The tyre overall diameter In serVIce shall be nleasured lueasured shall not be greater 6 lun1 than the fied in the '-.. v •. J.L,.. .....

6.3 Measurement of tyre dimensions in service

The shall be mounted on the applicable rilU

to 6.3. and the overall dialueter speci-

to the lllarked inflation pressure and allowed to stand for a lllinimum of 24 h, after which the inflation pressure shall be readjusted to the original value and the m.eas~ urement shall be on the tyre under no-load condition. If the marked infla-tion pressure is a range, the ll1aximu111 value shall be used.

y.ig1ng.th~.~1~.0.i?\n~~sl.y~11A~.by.Jf .. (:: .. $ ... l4!:.Thl?.ty.K~.Qy~nl,U .. w.igth.~hJ~._U.h§_.m~~~~r~d.~ith y.~:rJli~r_~~Ul?_~_1,'§.(l?§~.f.igg!-:~.1.tQ_fi.g:~!~E?~.42:

7 Quality

7.1 Appearance

Bead wire

Tyre overall width

width Tread

Sidewall

Rim

4 Example of tyre dimension measurement tyre)

shall be uniform in and thickness, and free fron1 scratches, rub-ber cracks, inferior rubber and harn1ful due to foreign n1atter inclusion, and shall be free from visible distortion when mounted on a riln recOInmended in table 1 to table 301' any rim upon between the concerned with

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8 K 6302 : 2011

7.2 Perforlnance The peformance of which is divided into that of bicycle tYl'es and that of deliv-

ery bicycle when tested by clause 8, shall conform to the in table 4 or table 5.

Table 4 Performance bicycle tyres

Item Test Performance Test sub'clause

Tensile Tread rubber tensile 8.0MPa min. S.l strength of test tread rubber

Elongation of 350 % min. tread rubber

Bending Bead rubber The bead rubber shall not S.2 resistance of bending test break. bead rubber i')

Tensile Bead wire tensile 3.2kN min. S.3 .".1- of test

I bead wire j,) Tensile Carcass cloth 40.0 N/mm min.

I S.4

strength of tensile test carcass cloth

Cohesive Peeling test Rubber to cloth I 2.0 N/mm min. 8.5 strength Cloth to cloth I 2.0 N/mm min. Breaking Plunger test 7.0 J'min. 8.6 energy

Rim Water pressure test OJ Width < 13/8 (or 1.:37) 800 kPa min. 8.7 running"off .~ O:l I ~~dth 13/8 (or 1.37) 600 kPa min, (/) p resistance h) OJ bp .§ idth J.3/4 (or 1.75) ..... 'w

~~ -'"" Width 2 P/.l, (or 1.75) 500 kPa min. Running Running durability Dia . .5 18 2000 km 8.8 durability c) test c:: 20 .5 Dia. 525 3000 km

Q 0 ~~ Dia. 2 26 and N

'00 2i Width 13/g (01' 1.37) i:: .~ :>, (],) Dia. 26 5000 km F-

9 K 6~302 : 2011

Table 5 Performance of delivery bicycle

Item Test

Tensile Tread rubber tensile strength of test tread rubber

Elongation of tread ruhhei'

Bending Bead rubber resistance of bending test bead rubber al Tensile strength of bead wire b)

Tensile strength of carcass cloth

Cohesive strengt.h

Breaking energy

Bead w ire ten sile test

Carcass cloth tensile

Peeling test

Plunger test

otes il} To be applied to BE tyres. b) To be applied to WO tyres.

8 Test method

8.1 Tread rubber tensile test

Performance

8.0MPamin.

;300 % min.

']'he bead rubber shall not break

3.2 kN min.

Width:?:: 13/4 (or 1.75) 2 PR 50.0 N/mm min, ill § Width < 211::. (or 2.50) 4 PR 32.0 N/mm min.

I .~.~ vVidt.h:?:: 21/2 (or 2.50) 2 PR 50.0 N/m I ~, .~ 4 PH, 40.0 N/mm min.

'" 6 PR ;32.0 N/mm min.

mIn.

6.0 J min. 20.0 J min.

l\tfeasure the tensile and the elongation at break through methods given in JIS K 6251 and using a test piece of No.3 dumbell

Test sub'clause

8.1

8.2

8.3

8.4

8,5

8.6

by the

piece shall be taken, in the circumferential direction of the tyre, from the ground con-tact part of the tread rubber which has been off f1'0111 the sample tyre.

8.2 Bead rubber bending test

Peel off carefully about 100 Inm length of bead rubber from the sample tyre and use it as the test Place a round bar of 10 mm diameter on the test piece at right mr

to the longitudinal direction of the test piece, and bend the test around the round bar at the nlid-point of its bottom face adjacent to the carcass gradually to an angle of 90°, and hold it at this angle for 1 min. See if any fracture occurs in the test piece, The standard and the standard humidity of the shall be in accordance with 6.1 and 6.2 of JIS K 6250, respectively.

8.3 Bead wire tensile test

The bead wire tensile test shall be as follows.

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10 K 6302: 2011

a) In the case of hard d.rawn steel wire If the sample is a single wire, take a wire of about 200 mnl length so as to include the joint, such that the joint is at the Inid-point of the test piece. Perforlll the tensile test specified in JIS Z 2241 using this test piece, and express the l11eaSul'ed value of tensile strength in kN. If the sample consists of two or more wires, use one of \vires by avoinding the part where the wires are overlapped, and multiply the result by the number WIres. For the test result, round the mean of the measured values of the two test pieces to one decimal according to the rounding method in JIS Z 8401.

b) In the case of aramid fibre Perform the test method specified in 8.5 a) of JIS L 1017, and express the measured value of tensile strength in kN. For the test result, round the measured value to one decimal place according to the rounding method in JIS Z 8401.

8.4 Carcass cloth tensile test

Take a cloth layer of 10 mnl width (measure the innerlTIost layer f1'0111 a lower point of the tread central part in the case of cord fabrics) from the carcass cloth in the direc-tion of warp if it is cord fabric, and in both directions of warp and weft if plain weave fabric, to prepare the test piece. lVleasure the tensile strength of the carcass cloth by Class 1 or better tensile tester specified in JIS B 7721 according to the nlethod in a) 01' b), in the case of cord fabl'ics, and according to the method b), in the case of plain weave fabric. The tensile speed shall be 200 111m to 300 mnl per lnin, and and the free length of test piece between grips shall be at least 20 mm. The standard temperature and standard humidity of the laboratory shall be in accordance with 6.1 and 6.2 of JIS K 6250 respectively.

a) Method A }\treasure the maximuim tensile force when all cords of 10 mm width test piece break sinlultaneously, and calculate the tensile strength by the following formula. For test result, round the mean of the values obtained from three test pieces to one decimal place according to the rounding rnethod specified in JIS Z 8401.

where,

L=~ P b PR

L: tensile strength (N/mm)

s: nleasul'ed tensile force value (N) b: width of test piece (mm)

p: actual number plies

PR: ply rating

b) Method B Measure the maximum tensile force of each cord of 10 mm width sam-ple, and take the sum total S' to calculate the tensile strength by the following for-

mula. For the test result, calculate the mean of measured values of thl'ee test pieces, in the case of cord fabric, and the mean of measured values of' warp and weft, in the case of plain weave fabric, and round the result to one decimal place according to the rounding method specified in JIS Z 8401.

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L'=S' b

L ' :

P

PR tensile strength (N/mnl)

11 K 6302: 2011

Sf: sum total value of tensile force of each cord (N)

b: width of test piece (mlll)

p: actual 111tlnber of plies

PR : rating

8.5 Peeling test

8.5.1 Cohesive strength between rubber and cloth

The cohesive strength between rubber and cloth shall be as follows.

a) If the carcass cloth is cord fabrics, take a piece of about 15 nlm from the sanlple in the direction parallel to the warp of cloth adjacent to the tread and cut off the bead part at one end. pee] off a srnaU part of the cloth adja~ cent to the tread rubber from the tread rubber, and leaving the cloth of 10 mm width measured across the warp, pull out the disuse cords on both sides to prepare the test piece. In this case, all other cloth shall be attached to the cloth layer adjacent to the tread rubber.

If the sample carcass cloth is plain weave fabrics, prepare the test pieces, simi-larly to the case of cord fabrics, in both directions of warp and weft.

b) Scrape off the patterned ribs of the tread rubber until approximate flatness is ob-tained, clanlp the tread rubber side in the upper of a peeling tester and per-form at a rate of 25 mlnlmin ± 2.5 n1m/olin to obtain the curve of tensile force required for peeling drawn by an autogl'aphic recorder. Calculate the mean value of each peak side numerical value) of waveforul in this curve and record it as the cohesive strength.

c) The cohesive strength shall be expressed in Nhnnl, and the test result shall be represented by each luean value of the nleasured values three test pieces cord fabrics and of two test (one along warp and one along weft) for plain weave fabrics, which is rounded to one deciInal place according to the rounding method specified in JIS Z 8401.

d) The standard temperature and the standard humidity of the laboratory shall be in accordance with 6.1 and 6.2 of JIS K 6250, respectively.

8.5.2 Cohesive strength between cloth and cloth

Cut out a test piece of about 20 lnll1 width fronl the in parallel to the warp of the cord fabric layer, and peel from one of its a part of the cord fabric first of 10 mm width while leaving both and pull out each cord to both sides. Then, after the tread patterns until approxilnate flatness is ob-tained, carry out the test by the same method as described in 8.5.1.

\tVhen peeling off, the cord fabric fIrst shall retain as little rubber as possible.

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12 K 6802: 2011

8.6 test

Put a rubber tube of the corresponding nOlninal size into the sample tyre, mount it on a rilll recommended for the tyre, and inflate the tube with a 350 kPa ± 10 kPa.

pressure of

The test apparatus shall be capable a of 8.0 mm ± 0.1 mIn di-anleter with a semispherical at a rate of 50 mm ± 2.5 mm per min.

For the measurement, press the plunger, perpendicularly to the tyre onto a pro-trusive of the tread pattern as near the centre of the as possible, at a rate of 50 mIn ± 2.5 mm per 11lin. JVleasul'e the pressing forces and plunger travels at the re-spective positions the periphery before the tyl'e breaking. V\rhere the l'eaches the rim without the tyre bursting, record the value just before it reaches the rim.

Calculate the breaking energy at each measuring IJV,:u.IJ~.V.U. by the following A.V.l .. LU ..... ..l(:~.

where,

FxP W=

2 TV : breaking enel'gy (J)

F : force at tYl'e breaking (N)

P : plunger travel

The breaking energy of the tYl'e shall be the mean of the values of the breaking energy W calculated by the above formula from two of the four measured values obtained at four positions, excluding the l11axinlulu and minimum values. The results shall be rounded to one decimal place according to the rounding method specified in JIS Z 840l.

8.7 Water pressure test for rim running off resistance

8.7.1 Test apparatus

For the test apparatus, a water pressure testing manual pump or an equivalent, which uses a pressure proof hose or a pipe with a minium inner mallleter of 3 111m as the conduit to connect to a tyre rubber tube. The length of the conduit shall be 2 m or less.

The testing rim shall be that specified in JIS D 9421 and shall be symmetrical. Those other than specified in JIS D 9421 111ay be used upon agreel11ent between the parties concerned with delivery.

8.7.2 Test method

l\10unt the specinlen on an appropriate 1'il11 as described above, and connect to the water pressure tesitng pU111P through the conduit. After deflating the tube, re-inflate to apply inner pressure gradually to adjust to position the bead in the correct and increase the inner presssure gradually. The inner pressure shall be applied gradually by attaining the standard inflation pressure specified in table 1 to table 3, thereafter raised at a rate of 100 kPa ± 10 kPa per min. Read the pressure when the bead runs off from the rim at any place, and take the value as the rim running-off pressure. The indicator shall be read at time of pointer stabilizing, and the measuring unit shall be 100 kPa.

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8.8 Running durability test

8.8.1 Test apparatus

13 K 6302 : 2011

The test apparatus shall be constructed so as to press the tyre on a drum surface

perpendicularly toward its centre to interlock the tyre with the drum rotation. The drunl

shall be made of iron with a smooth surface, and shall have the outer diameter of 760

lllm ± 10 111m and the width not less than twice the nOlninal width of specimen tyre. The

drum shall be attached with two shock bars of a length equal to the drum width on the

surface at even intervals along the periphery and in parallel with the drum axis.

The sectional shape of the shock bar shall be a rectangle of 10 mm ± 0.1 nnll width and

5 mm ± 0.1 mm height with each curvature radius of LO nnn ± 0.05 mm on the corners.

8.8.2 Test method

Putting a rubber tube of the corresponding designation into the sanlple tyre, and

mount thenl on a recommended rinl. Apply the standard inflation pressure specified in

table 1 to table 3 in the tube. Then, press the tyre vertically on the drum face with the maxinlum load specified in table 1 to table 3, and rotate the tyre through the dl'Ulll

rotating. Set the drum rotating speed at a rate 40 km/h ± 4 km/h to perform the running

test until the running distance on the drum surface attains the running endurance

distance by the tyre designation given in table 4, and examine the tyre condition.

The room temperature of laboratory, measured at a position apart 1 m or 11101'e from

the specinlen, shall be 25°C ± 10°C.

8.9 Sidewall rubber owning test

8.9.1 Sampling and preparation of test piece

The sampling and preparation of test piece shall be as follows.

a) Cut the tyre into 60 mIll length x 55 mIll width, and take it as the test piece.

b) After heat-treating the test piece in a thermostat at a temperature of 60°C ± 2 °C

for 1 h, wind it around a round bar (¢ 15 mm) to make it a flat strip.

8.9.2 Test method

The test method shall be in accordance with JIS K 6259. In this case, the ozone concentration shall be 250 ppb ± 50 ppb, and the testing time shall be 16 h. The part

within 5 mm of the tyre tightening part shall not be evaluated.

9 Designation of products

Products shall be designated by the number of this Standard, "bicycle tyre" (name) or

"delivery bicycle tYl'e" (name) and tYl'e size designation.

Example 1 JIS K 6302 Example 2 Bicycle tyre

26 X 13/8 20 x 1.50

Exanlple 3 Delivery bicycle tyre 26 x 2

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14 K 6302 : 2011

10 Marking

shalll be lnal'ked indelibly with following infol'lnation.

a) Tyre size designation

b) Standa,rd inflation pressure, maxium inflation pressure QK.X~~Q!TI-)))..~.n!"!5?£t.int1!!tiQ;Q

P~:~:?t?Hr~. XJJ.Ilg~

Example 1 Standard inflation pressure 300 kPa Example 2 l\tfaxiulunl inflation pressure 350 kPa .LJ"",CU,jL!.jJJlC-,:3 Recommended inflation pl'eSSUl'e range 250 kPa to 350 kPa

92 .... M.~J1~i~9.t~};'5?~:'_1?_.n~.mJ~_gx.j..t~_~gJ?X~yi.~.tj.Qn

~U .... NYmh~f:.9X .. ~Yn1hQt.Qf.m~H.l.qf~~tm.~~.

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'"d ~ o --3 tr:i o ...., tr:l t::1 b:::J ~ o o '"d

~ ~ --3

Annex JA (informative) Comparison table between JIB and corresponding International Standard

-. JIS K 6302 : 2011 G.vcles T..vres ISO 5775-1: 1997 Bicycle tYl'es and lims - P8l'i: 1 : T..vl'e designations

and dimensiOJls -

(I) Requirements in JIS (II) Inter (III) Requirements in (IV) Classification and details ot'technica 1 (V) Justification for the

national International Standard deviation between JIS and the Intcl'na- technical deviation and

Standard tional Standard by clause fu ture measures

No. and Content number No. of Content CIHssifica- Detail of teehnical deviation

title of clause tion by

clause clause

1 Scope This Standard speci- 1 This International Addition bicycle tyres are not The delivery bicycle tyres

fies the pneumatic Standard specifies covered by the ISO standard. are added to JIS to suit

tyres for bicycles the wired edge tyres JIS specifies delivery bicycle the situations in ~Japan.

specified in JIS D mounted on SS and tyres of nominal tyro width Possibility of submitting

9111 and pneumatic C rims, and beaded 13/401' over. revision proposal to ISO

tY1'8S for delivery bicy- edge tyres mounted will be discussed.

des. It docs not apply on HE rims. Tubular to tubular tYl'es (round sew-up tyres and

or tubeless non-pneumatic tyres

tyres. are not covered.

I

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(I) Requirements in JIS

No. and Content

title of

clause

3 Terms designation of the tyre

and size indicated as

definitions "(nominal tyt"e overall

3.1 tyre diameter) x (nominal

size tyre width)" 01' (nomi-

designa tion nal tyre width)-

(nominal rim diame-

ter)

-

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OJ Requirements in JIS

No. and

title of

clause

3.2 3.17

Classifica"

tion

5

Dimensions

Content

Definitions of'terms.

Reference to JIS D

9421 fat· details of

applicable rims is

given.

Tyres arc classified

into those for bicyeles

and those for delivery

bicycles, and further

into three types accord-

ing to the type of bead.

Dimensions are

specified i'm' each type

of tyre, in table 1 to

table

(II) Inter-

national

Standard

number

(In) Requimments in

International Standard

No. of

clause

4.2.3

5.2.'1

Content

Tyres are classified

into two types

according to the

applicable rim.

Dimensions are

specified for each

type

(IV) Classification and details of technical

deviation between JIS and the Interna-tional Standard by clause

Classifica'

by

clause

Addition

Addition

Addition

Detail of technical deviation

In JIS. definitions terms

that are used in this

Standard are added.

The bead type BE is added in

JIS since BE tyros for heavy

goods delivery bicycles are

c:ixculated in ,Japanese mar

ket.

In JIS, applicable rims for

respective tyro designations

are shown, together with

specifications of tyro overall

width I.md overall diameter,

,,,,horeas in the the

measuring rim width, tyre

section width and section

height are for

respective nominal section

widths.

(v) Justification tor technical deviation and

future mensures

Clear definitions of terms

at'e given. No substantial

deviation

BE tyres are added to JIS based on the current circu-

lation ill the ,Japanese

market. Possihili ty of s uh'

mitting a revision proposal

to ISO ,,,,ill be discussed. BE are added to JIB based on the current

circulation in ,Japan.

Possibility of submitting a

revision proposal to ISO win be discussed.

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-(I) Requirements in JIS UV Inter-

national

Standard

No. and Content number

title of

clause

5 (eoncluded)

6 Tyre The measured tyre

dimensions overall width shall not

6.1 Tyre be greater by 3 mm

overall than the specified

width value.

6.2 Tyre The measured tyre

overall overall diameter shall

diameter not be gL'eatel' by 6 mm

than the specified

value.

(III) Requirements in

International Standard

No. of Content

elaus8

4.2 The maxim urn width

in service and the

maximum overall

diameter in service

are specified.

(IV) Classification and details oftechnical

deviation between JIS and the 111termr

tiol1al Standard by clause

Classifica- Detail of technical deviation

tion by

clause

The format of the table is changed fi'Oll1 that of the ISO, but in this revision, the specifications ofWO and HE tyre width and overall diame-ter are aligned with ISO, and for the specification of BE tyl'es which are not given in the ISO, conventional val'1l.8s frOl'n the previous edition of this JIS are adopted.

Altel'ation In ISO, the calculation

methods for obtaining the

maximum width in service

and maximum overall di-

ametcl' in service are shown.

(V) Justification for the

technical devia tion and

future measures

No substantial deviation.

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(I) Requirements in JIS

No. and Content

title of

clause

63 In addition to the Measure- measurement method

ment of ofISO, the in8t1'u'

tyre ments for measuring

dimensions the overall diameter

in service and overall width are

specifically given.

7 Quality

7.1 The appearance of tYl'e

Appearance is .. f": ~l

7.2 Performance of tyres is

Performance separteiy specified for

bicycle tyres and deliv-

ery bicycle t.yree.

8Test

method

(II) Inter- (Ill) Requirements in

national International Standard

Standard

number No. of Content

clause

4.4 Tyres shall be

5.3 mounted on applica'

hle rims, inflated to

the recommended

inflation pressure

and allowed to stand

for 24 h, after which

the inflation pres'

sure shall be read-

j usted to the original

value and measure-

shall be per-

-

-

.-

-

(IV) Classification and details of technical

deviation between JIS and the Interna-

tionaI Standard by dause

Classifica' Detail of technical deviation

tion by

clause

Addition In JIR the instruments that can used for measurement

are shown for pl'eventing

possible confusions in actual

measurements.

Addition In JI8. quality requirements and their test methods are

specified for implementation

of the JIS marking system.

Addition In JIS, quality req uil'ements

and their test methods are

specified for implementation

of the JIS marking system.

Addition In JIS, quality requirements

and their test methods are

specified for implementation

of the JIS .1_~ . ~ system.

Justification for the

technical deviation and

future measures

lVleasuring instruments

are specifically given. and

this causes no substant.ial

deviation.

Possihility of submitting a

revision pl'Oporsal ISO will be discussed.

Possibility of submitting a

revision pl'oporsal to ISO

will b

f-d

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(I) Requirements in JIB

No. and Content

title of clause

9 Designation of tyres is

Designation specified.

of products

10 Marking Markings of tY1'e size designation, stamlawl inflation pressure or

maximum inflation pressure or recom-

mended inflation pressure rangE:), name of manufacturer and

number of manufac'

tUl'C.

-.

(U) Inter- (IlI) l{equirements in

national International Standard Standard

number No. of Content

clause

-

4.1 Tyl'e designation

sha 11 be shown on the sidewall of the

tyro.

4.1.3 Preferred direction of rotation of tyre indi-

cated with an arrow. markings of recom'

mended inflation

pressure or maxi-mum inflation pres-sure, and other chal'"

acteristics.

AnnexA Old marking

~3 OJ C0 0

(IV) Classification and details of technical (V) Justification for the t-,::)

deviation between JIB and the Inte1'na- technical deviation and t~ 0

tiona1 Standard by clause future measures I-' I-'

Classifica· Detail of technical deviation tion by

clause

Addition In JIB, the designations are Possibility of submitting specified for smooth business revision propol'sal to ISO

tradings. will be discussed.

Addition In JIS, Il1arkings of Possibility of submitting a •

manufacturer's name and revision proporsal to ISO

number of manufacture a}~e will be discussed.

added. JIS adds .1.

items for ensuring the benefit of users'.

Deletion In JIS, this content is con- No suhstantial alteration.

taincd in table 1 and table 2.

Therefore this Annex A is deleted.

'i:I ~ o 1-3 [:l:j o ~ u Cd r-

Errata for JIS (English edition) are printed in Stlwdardizatioll fwd Quniity COllIT01, published monthly by the Japanese Standards Association, and also pI'ovided to subscribers of JIS \i:J!lbJ.l;::>H edition) in l11011tl11.v hlformntiol1.

ElTata be provided upon request, please contact: Standards Publishing Department, Japanese Standards Association 4-1-24, Akasaka, Minato"ku, Tokyo, 107-8440 JAPAN TEL. 03-3588-8002 FAX. 03-3583-0462

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