b

b
1
JISJAPANESE
INDUSTRIAL
STANDARD
Translated and Published by
Japanese Standards Association

@ JIS K 6366119~8
Motorcycle tyres

ICs 83.160.10
Descriptors : pneumatic tyres, tyres, motor cycles, natural rubber, synthetic rubber
Reference number : JIS K 6366 : 1998 (E)

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STDOJIS K b3bb-ENGL L99a 4933b08 O555225 Yb2 W

K 6366 :1998

Foreword
This translation has been made based on the original Japanese Industrial
Standard revised by the Minister of International Trade and Industry c
through deliberations at Japanese Industrial Standards Committee i n
accordance with the Industrial Standardization Law. Consequently JIS
K 6366 : 1994 is replaced with JIS K 6366 : 1998.
Date of Establishment: 1976-01-01
Date of Revision: 1998-09-20
Date of Public Notice in Official Gazette: 1998-09-21
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Investigated by: Japanese Industrial Standards Committee

Divisional Council on Consumer Life

JIS K 6366:1998, First English edition published in 1999-06

Translated and published by: Japanese 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.

Q JSA 1999
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

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JAPANESE INDUSTRIAL STANDARD @ JIS K 6366 : 1998

Motorcycle tyres

Introduction This Japanese Industrial Standard has been prepared based on the second
edition of I S 0 10231, Motorcycle tyres - Test methods for verifying tyre capabilities,
published in 1997, without changing the technical contents for the corresponding parts
(scope, definitions, test equipment, testing method and performances) while the items
(dimensions, appearance, marking) not specified in the corresponding International Standard
have been supplemented. Enveloping curve for the contour of the tyres for the centrifugal
growth test (Annex A), however, is adopted in advance based on the revision draft of ISO.

1 Scope This Japanese Industrial Standard specifies test methods for verifying the capa-
bilities of newly manufactured tyres for motorcycles (hereafter referred to as “tyres”).
The capability test of tyres shall apply as follows according to the type of tyres.
The first test is the strength test for assessing the capability of the tyre structure with
respect to breaking energy in the tread area.
The second test is the endurance test to assess the capability of the tyre with respect to
service at full load over long distances.
The third test is the high-speed test to assess the capability of the tyre as related to
service at the maximum speed Capability of the tyre. It does not apply to tyres with a speed
capability below 130 km/h.
Centrifugal growth test is the test for measuring the growth dimension of the tyre under
the influence of centrifugal forces during the high-speed running, and it does not apply to
tyres with a speed capability below 150 k m h .

Remarks : The International Standard corresponding to this Standard is shown below.

IS0 10231 Motorcycle íyres- Test methods for verifying tyre capabil-
ities

2 Normative refereces The following standard contains provisions which, through refer-
ence in this text, constitute provisions of this Standard.
The following edition was effective when this Standard was issued, but every standard is
subject to revision, so the most recent edition of the standard shall be applied.
JIS D 4203 : 1998 Motorcycle tyres -Designation and dimensions

3 Definitions For the purpose of this Standard, the definitions in JIS D 4203 apply, and
b the rest of the terms are as follows.

a) bead separation Peeling of bond between components in the bead area.

s
b) belt separation Peeling between belt layers or between belts and plies.
c) chunking Partly peeling found in the tread rubber.
d) cord separation Peeling between the cord and adjacent rubber components.

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STD*JIS K b3bb-ENGL 1998 D 4933b08 05SC2Z7 735 W

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K 6366 : 1998

cracking Any cracking of rubber, extending to the cord, which occurs in the tread,
sidewall, or innerliner.
innerliner separation Peeling between the innerliner and carcass.
open splice Parting at the connected part of tread, sidewall, and innerliner.
ply separation Peeling between adjecent plies.
sidewall separation Peeling between the sidewall rubber and cord.

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tread separation Peeling between the tread and carcass.
test rim Specified rim that conforms to the nomination for the size of tire.
test drum speed Speed of the outer surface of the steel drum.
tyre speed Peripheral speed of the tire tread.
maximum load rating The maximum mass chargeable on the tyre under the specified
condition.

4 Test equipment

4.1 Test drum The steel drum, measuring 1.7 m f 1% or 2.0 m+ 1 % in diameter, which
has smooth surface and width more than the overall width of the test tyre, shall give the load
(mass or force) and speed necessary for the test.
The loading device may be a dead-weight cantilevered system with a hydraulic system
or with any other equivalent system, with an accuracy within k 1.5 % of the full scale, and its
speed has an accuracy within k 3 % of the full scale.

4.2 Plunger Cylindrical steel plunger of sufficient length with a hemispherical end
measuring 8 mm 0.6 mm in diameter. *
The loading device shall be of hydraulic type or equivalent system with an accuracy
within f1 % of the full scale, and the speed of displacement shall be controlled with an
accuracy within k 3 % of the full scale.

4.3 Air pressure gauge Capable of measuring at least 400 kPa with an accuracy within
k 10 kPa.

4.4 Apparatus for centrifugal growth test The bead part and frange of the test rim,
which has been fixed on a test axle, shall be controlled in order to ensure a radial run-out less
than f0.5 mm and a lateral run-out less than k0.5 mm.
The detecting device (projecting apparatus, a camera, etc.) is capable of reading the
L
deformation shown by the tyre tread both when its being stopped and when at the maximum
speed, and of decreasing the distortion as small as possible, and ensures a constant ratio
between the plotted contour and the actual dimensions.

5 Testing method

5.1 Strength test

5.1.1 Preparation of tyre

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K 6366 : 1998

5.1.1.1 Mount the tyre on a test rim and inflate it to the pressure specified in relation to the
maximum load rating.

5.1.1.2 Maintain the assembly at test room temperature for at least 3 h.

5.1.2 Test procedure

5.1.2.1 Readjust the tyre pressure to that specified in 5.1.1.1 before or after the mounting
of the assembly on the testing apparatus.

5.1.2.2 Position the plunger as near to the centreline as possible, avoiding penetration into
the tread grooves, and force the plunger perpendicularly into the tread at a rate of 50 mm/min
k 2.5 mm/min.

5.1.2.3 Record the force for penetration and distance of penetration at each of five points
approximately equally spaced around the circumference of the tyre. In case of tyres mounted
on nominal rim diameter of 10 and smaller, test the tyre at three points.

5.1.2.4 If the tyre fails to break before the plunger is stopped on reaching the rim, then the
tyre is deemed to have passed the test at that point.

5.1.2.5 Compute the breaking energy for each test point, except those considered by
5.1.2.4, by means of the following formula.

where, W : breaking energy (J)

F : force for penetration (N)
P : distance of penetration (mm)

5.1.2.6 Determine the breaking energy value for the tyre by computing the average of the
values obtained.

5.1.2.7 When an appropriate device which automatically evaluates the value of the energy
is available, the penetration can be stopped shortly after having achieved the prescribed
value.

5.1.2.8 In the case of tubeless tyres, means may be provided to ensure the retention of the
inflation pressure for the d u r a t h of the test.

5.2 Endurance test

5.2.1 Preparation of tyre

5.2.1.1 Mount the tyre on a test rim and inflate it to the pressure specified in relation to the
maximum load rating.

5.2.1.2 Maintain the assembly at 35 "C or a higher temperature for at least 3 h.

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K 6366 : 1998

5.2.2 Test procedure

5.2.2.1 Readjust the tyre pressure to that specified in 5.2.1.1 immediately before the test.

5.2.2.2 Mount the tyre on a test axle and press it against the outer face of a test drum.

5.2.2.3 During the test the ambient temperature, at a distance from 150 mm to 1 O00 mm
of the tyre, shall be at least 35 O C , and no provision shall be made for cooling the tyre during
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the test.

5.2.2.4 Under the test conditions shown in Table 1, conduct the test, without interruptions,
at 80 km/h or a higher speed.

Table 1 Test conditions for endurance test

Test period Duration h Load for test
1 4 100 % of the maximum load rating
2 6 108 9% of the maximum load rating
3 24 117 % of the maximum load rating

5.2.2.5 Throughout the test, the inflation pressure shall not be corrected and the test loads
shall be kept constant at each test step.

5.3 High speed test

5.3.1 Preparation of tyre

5.3.1.1 Mount the tyre on a test rim, inflate it to a pressure as shown in Table 2. When the
tyre manufacturer requests, giving reasons, the use of a different test inflation pressure other
than that shown in Table 2, the tyre shall be inflated to that pressure.

Table 2 Inflation pressure for high speed test

~~
Unit : kPa
Tyre version Speed symbol Inflation pressure
M to P inclusive 250
Q, R,S I 300
sv
T,U, H,V I 350

W I 320
M to P inclusive I 330
?
Q to H inclusive 390
Note ( * ) Reinforced tyres are included.

5.3.1.2 Allow the tyre to stand at room temperature for 3 h or more.

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K 6366 : 1998

5.3.2 Procedure for test

5.3.2.1 Readjust the tyre pressure to that specified in 5.3.1.1.

5.3.2.2 Mount the tyre on a test axle and press it against the outer surface of a test drum.

5.3.2.3 Apply a load equal to 65 % of the maximum load rating of the tyre to the test axle.
In case of tyres designed for heavyweight touring motorcycles i.e. tyres with a nominal
diameter of 15 and above and a load capacity index (LI) 65 and above in rein-
forced/extra-load version, the load shall be 75 % of the maximum tyre load rating.
Annex B gives information on related high speed tests.

Remarks: The load capacity at the maximum speed shall be as follows according to the
speed symbol of tyres.
- In case of H or less, 100 % of the value indicated by load capacity index
(LI)
- In case of V, 85 % of the value indicated by load capacity index (LI)
- In case of W, 75 % of the value indicated by load capacity index (LI)

5.3.2.4 Throughout the test, the inflation pressure shall not be corrected and the test load
shall be kept constant at each test step.

5.3.2.5 The ambient temperature of tyre shall be 20 "C to 30 "c, and if the tyre manufac-
turer agrees, higher temperatures can be used.

5.3.2.6 Carry the test through as follows, in relation to the tyre speed symbol and the test
drum diameter.

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a) The initial test speed is as follows according to the tyre speed symbol.
- When the diameter of the drum is 1.7 m k 1 %, the maximum speed shown in tyre
speed symbols - 40 km/h
- When the diameter of the drum is 2.0 m k l %, the maximum speed shown in tyre
speed symbols - 30 km/h
b) Accelerate the equipment at a constant rate such that the initial test speed is reached at
the end of 20 minutes from start-up.
c) Operate the equipment with the test drum speed at the initial speed for 10 minutes.
d) Operate the equipment at the initial speed +10 km/h for ten minutes.
e) Operate the equipment at the initial speed +20 k m h for ten minutes.
f) Operate the equipment at the initial speed +30 km/h for ten minutes.

5.4 Centrifugal growth test

5.4.1 Preparation of tyre

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K 6366 : 1998

5.4.1.1 Mount the tyre on a test rim and inflate it to the pressure shown in Table 3.

Table 3 Inflation pressure for centrifugal growth test

Unit : kPa
I Speed symbol I inflation pressure I
P I
225
Q to S inclusive 250
T to H inclusive 280
Over V 290

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5.4.1.2 Maintain the tyre and rim assembly at test room temperature for not less than 3 h.

5.4.2 Test procedure

5.4.2.1 Readjust the tyre pressure to the value specified in 5.4.1.1.

5.4.2.2 Mount the tyre on the test axle.

5.4.2.3 Position the detecting device so that it is perpendicular to the rotation direction of
the test tyre.

5.4.2.4 Accelerate the tyre to reach the maximum test speed within 5 minutes from
start-up. The tyre may be rotated either by means of driving the testing axle or by pushing
method of the tyre on the test drum (see 4.1).

5.4.2.5 Rotate the tyre at the maximum speed of the tyre k 2 % for at least 5 minutes, and
measure the dimensions of the tyre while it keeps its rotation speed.

5.4.2.6 The ambient temperature of the tyre shall be 20 OC to 30 OC, and if the tyre
manufacturer agrees, higher temperatures can be used.

6 Performance

6.1 Test tyre Prepare three tyres with the same specification, and test each tyre under the
conditions conforming to each test method such as inflation pressure, test load, and test
speed, and the requirements shown in 6.2 to 6.5 shall be satisfied.

a) One tyre shall be used for the measurement of strength.

b) Second one for endurance test.
c) Third one for high speed test and centrifugal growth test.

6.2 Strength test

6.2.1 When the test is carried out according to 5.1, the test results shall show at least the
value in Table 4.

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K 6366 : 1998

Tyre version Minimum breaking energy

LV 17
sv 34
45

6.2.2 For tyres with a design section width less than 62 mm, the required energy value is to
be 15 % reduced from the value shown in Table 4.

6.3 Endurance test

6.3.1 Employing a test rim and a valve with no deformation and no air leakage, when the
tyre is tested according to the endurance test specified in 5.2, there shall be no visual
evidence of tread, ply, cord, belt or bead separation, chunking, open splices, cracking or
broken cords.

6.3.2 If the final pressure measured immediatly after the test is less than the initial
pressure, the test shall be repeated with another tyre.

6.4 High-speed test

6.4.1 Employing a test rim and a valve with no deformation and no air leakage, when the
tyre is tested according to the high-speed test specified in 5.3, there shall be no visual
evidence of tread, ply, cord, belt or bead separation, chunking, open splices, cracking or
broken cords.

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6.4.2 If the final pressure measured immediatly after the test is less than the initial
pressure, the test shall be repeated with another tyre.

6.5 Centrifugal growth test

6.5.1 The test tyre shall be the tyre that has passed the high-speed test (see 6.4), or if a
newly manufactured tyre is used instead, break-in running shall be sufficiently carried out.

6.5.2 The growth dimensions of tyre at the maximum speed of the tyre shall not exceed the
enveloping curve defined in Annex A.

7 Dimensions The dimensions of tyre shall conform to the standard specified by JIS D
4203 or public organizations.

8 Appearance The appearance of tyres shall be balanced on shape and wall thickness,
free from remarkable dirt, and be free from defects harmful for use such as flaws, bubbles,
rubber cracking, incomplete rubber flows, and presence of foreign objects.

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K 6366 : 1998

9 Marking

9.1 General Tyres shall be marked with items shown in 9.2 and 9.3 by means of
imprinting them on the metal mould of the tyre.

9.2 Wear indicator on tread

9.2.1 Tread wear indicator (slip sign) by which the wearing of tyre tread to 0.8 mm from
the bottom of groove is shown.

9.2.2 For tyres for winter use, the platform which indicates 50 % wearing of the tread
groove.

9.3 Marking of sidewall

9.3.1 Name of manufacturer or its abbreviation

9.3.2 Manufacture number or manufacture symbol

9.3.3 Designation of tyre (’)

Note (’) Conform to JIS D 4203 or the standards specified by a public organi-
zation.
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9.3.4 Literal symbols showing the type of tyre ( 3 ) (4).

a) “RADIAL” for radial ply tyre

b) “TUBELESS” for tubeless tyre
c) “SNOW”, “M+S”, or the corresponding letters for tyres for winter use

Notes (3) Both uppercase and lowercase letters are effective.

(4) When it is clear owing to a nominal sign of tyre or to a commercial name,
it can be omitted.

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K 6366 : 1998

Annex A (normative) Enveloping curve for the contour of

the tyre for the centrifugal growth test

Remarks: The value and definition of growth dimensions ( W , and D O M )shall follow
JIS D 4203 or the standards specified by a public organization.
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K 6366 : 1998

Annex B (normative) High-speed test conditions for tyres with

the maximum speed over 240 km/h

B. 1 This Annex specifies the high-speed test conditions for tyres marked with V or Z of
high-speed categories within the nominal tyre size (for example : 130/60V16, 130/60VR16,

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130/60VB16, 130/60ZR16, 130/60ZB16) among tyres whose the maximum speed exceeds
240 km/h.

B.1.1 The first high-speed test shall be carried out at the same conditions as that in 5 3 of
the Standard.
- The tyres marked with speed category code V (for example: 130/60V16, 130/60VR16,
130/60VB16) shall be regarded as V speed symbol.
- The tyres marked with speed category code Z (for example : 130/60ZR16, 130/60ZB16)
shall be regarded as W speed symbol.

B.1.2 The second high-speed test shall be carried out, using another tyre with similar
specifications, under the following conditions in accordance with 5.3 of the Standard.

a) The test load shall be 65 % of the load capacity at the maximum speed specified by the
tyre manufacturer.
b) Accelerate the equipment at a constant rate such that the initial test speed (see Annex B
Table 1) is reached at the end of 20 minutes from start-up.
c) Accelerate the equipment at a constant rate until the maximum speed, specified by the
tyre manufacturer, is reached at the end of ten minutes after the initial speed was
reached.
d) Operate the equipment at the maximum speed for 5 minutes.

Annex B Table 1 Initial test speed

I Test drum diameter

I vEr I ZBER
kmh I
1.7 m + 1 % I 200 230
2.0 m + 1 %
I 210 240

B.2 When the tyre, whose the maximum speed specified by the tyre manufacturer is the
value shown in speed category, is marked, that speed may be marked on the sidewall of tyre
(for example : The mark as V260 means the maximum speed is 260 kmh).

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11.
K 6366 : 1998

Annex C (informative) Related standards

1 IS0 3877-1: 1997 Tyres, valves and tubes -List of equivalent terms -Part 1 : Tyres
2 IS0 4249-1: 1985 Motorcycle tyres and rims (Code designated series) -Part 1 :
Tyres
3 IS0 4249-2: 1990 Motorcycle tyres and rims (Code designated series) -Part 2:
Tyre load ratings
4 IS0 4249-3 : 1997 Motorcycle tyres and rims (Code designated series) -Part 3 : Rims
5 IS0 5751-1 : 1994 Motorcycle tyres and rims (metric series) -Part 1 : Design guides
6 IS0 5751-2: 1994 Motorcycle tyres and rims (metric series) -Part 2 : Tyre dimen-
sions and load-carrying capacities
7 IS0 5751-3: 1994 Motorcycle tyres and rims (metric series)-Part 3 : Range of
approved rim contours
8 IS0 6054-1: 1994 Motorcycle tyres and rims (code-designated series) -Diameter
codes 4 to 12 -Part 1: Tyres
9 IS0 6054-2 : 1990 Motorcycle tyres and rims (code-designated series) -Diameter
codes 4 to 12-Part 2 : Rims

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