DRAFT INTERNATIONAL STANDARD ISO/DIS 4249-3

ISO/TC 31/SC 10 Secretariat: UNI

Voting begins on: Voting terminates on:

2009-06-09 2009-11-09
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION

Motorcycle tyres and rims (code-designated series) —

Part 3:
Rims

Pneumatiques et jantes pour motocycles (séries dont les dimensions sont désignées par des codes) —

Partie 3: Jantes

[Revision of fifth edition (ISO 4249-3:2004)]

ICS 43.140

In accordance with the provisions of Council Resolution 15/1993 this document is circulated in
the English language only.

Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué

en version anglaise seulement.

To expedite distribution, this document is circulated as received from the committee secretariat.
ISO Central Secretariat work of editing and text composition will be undertaken at publication
stage.

Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.

THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.

© International Organization for Standardization, 2009

ISO/DIS 4249-3

PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall
not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.

Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the
unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user's country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, photocopying,
recording or otherwise, without prior written permission being secured.

Requests for permission to reproduce should be addressed to either ISO at the address below or ISO's
member body in the country of the requester.

ISO copyright office

Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org

Reproduction may be subject to royalty payments or a licensing agreement.

Violators may be prosecuted.

ii © ISO 2009 – All rights reserved

 ISO/DIS 4249-3

Contents Page

Foreword ............................................................................................................................................................iv
1 Scope ......................................................................................................................................................1
2 Normative references............................................................................................................................1
3 Finish ......................................................................................................................................................1
3.1 Rim contour ...........................................................................................................................................1
3.2 Rim valve hole .......................................................................................................................................1
4 Designation ............................................................................................................................................3
5 Cylindrical bead seat.............................................................................................................................3
5.1 Rim contours .........................................................................................................................................3
5.2 Rim diameters........................................................................................................................................4
6 Tapered bead seat rims (MT type) .......................................................................................................5
6.1 Rim contours .........................................................................................................................................5
6.2 Bead seat contours ...............................................................................................................................7
6.3 Rim diameter and hump circumference..............................................................................................8
7 Permitted rim widths .............................................................................................................................8
Annex A (informative) Rim circumference measurement — Tapered bead seat (MT type) rims..............10
Bibliography......................................................................................................................................................12

© ISO 2009 – All rights reserved iii

ISO/DIS 4249-3

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 2.

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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 4249-3 was prepared by Technical Committee ISO/TC 31, Tyres, rims and valves, Subcommittee SC 10,
Cycle, moped, motorcycle tyres and rims.

This sixth edition cancels and replaces the fifth edition (ISO 4249-3:2004), of which has been technically
revised.

ISO 4249 consists of the following parts, under the general title Motorcycle tyres and rims (code-designated
series) :

⎯ Part 1: Tyres

⎯ Part 2: Tyre load ratings

⎯ Part 3: Rims

iv © ISO 2009 – All rights reserved

DRAFT INTERNATIONAL STANDARD ISO/DIS 4249-3

Motorcycle tyres and rims (code-designated series) —

Part 3:
Rims

1 Scope
This part of ISO 4249 specifies the rim dimensions for a selection of rims for motorcycle tyres. It sets only
those rim contour dimensions necessary for tyre mounting, and for fitting the tyre to the rim.

2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

ISO 4249-1:1985, Motorcycle tyres and rims (Code designated series) — Part 1: Tyres

3 Finish

3.1 Rim contour

The rim on the side of the tyre shall be smoothly contoured and free of sharp edges.

3.2 Rim valve hole

3.2.1 The rim valve hole shall be centred on the bottom of the rim well. On the tyre side, the edges shall be
rounded or chamfered. On the hub side, the edges shall be free of burrs, which could damage the valve.

Dimensions and tolerances of valve holes shall be as shown in Figure 1.

+0 , 5
3.2.2 The rim hole shall have a diameter of 8,3 − 0,1 mm. See Figure 1 a).

For the fitment of tubeless valves, a circumferential flat area of at least 14,5 mm is required on the tyre side of
the rim. The maximum thickness of the rim at the rim hole shall be 9,4 mm. See Figure 1 b).

At the request of the motorcycle manufacturer, rim holes of 11,3 +00,4 mm diameter may be provided; in this
case, the flat area around the hole shall be at least 19 mm diameter.

For the possibility of off-centre positioning, see Figure 1 c).

3.2.3 The rim shall be counter-bored at the valve hole to reduce the thickness to 4 mm maximum for
seating snap-in valves.

© ISO 2009 – All rights reserved 1

ISO/DIS 4249-3

Dimensions in millimetres

φ8,3 +0,5/-0,1

a) Tube-type valve

b) Tubeless valves

2 © ISO 2009 – All rights reserved

 ISO/DIS 4249-3

c) Off-centre (optional)c
a Optional.
b See 3.2.3.
c For rim codes MT 3.00 and larger, if the well contour offers sufficient space for the location of the flat area, the valve
hole may be positioned on the sidewall of the well.

Figure 1 — Valve hole dimensions

4 Designation

The rim shall be designated by its nominal rim diameter code and nominal rim width (for example, 18 × 1.85 or
17M/C × MT 3.50). See also ISO 3911.

5 Cylindrical bead seat

5.1 Rim contours

Dimensions and tolerances of the cylindrical bead seat rims shall be as shown in Figure 2 and as given in
Table 1.

© ISO 2009 – All rights reserved 3

ISO/DIS 4249-3

a See Table 2.

Figure 2 — Cylindrical bead seat rims

Table 1 — Dimensions of cylindrical bead seat rims

Dimensions in millimetres

Nominal rim A B G H P C R2 R1 R3 R4 R5
width
inches +1 min. ± 0,5 +1 min. min. max. min. min.
–0,5 –0,5

1.10 28 5 7 5 5,5
7 3 1,5
1.20 30,5 5,5 9 5,5 6 7
1,5 5
1.35 34 7,5
6,5 10 3,5 6 6,5
1.40 36 8 10
1.50 38 10,5 4 6,5 7 11,5
7,5 5,5
1.60 40,5 12 4,5 7,5 8 2 13
2
1.85 47 9 5 6 15
8,5
2.15 55 7,5 18,5
2.50 63,5 9,5 14 10,5 12,5
7
2.75 70 3 19
10,5 12 11 3
3.00 76

5.2 Rim diameters

Nominal rim diameter code, specified diameters and circumferences shall be as given in Table 2.

4 © ISO 2009 – All rights reserved

 ISO/DIS 4249-3

Table 2 — Specified rim diameters and circumferences for cylindrical bead seat rims
Dimensions in millimetres

Nominal rim Specified rim Specified rim

diameter codea diameter circumference
D πD
+2
−0,5

14 357,1 1 121,9
15 382,5 1 201,7
16 405,6 1 274,2
17 433,3 1 361,2
18 458,7 1 441
19 484,1 1 520,8
20 509,5 1 600,6
21 534,9 1 680,4
22 558,8 1 755,5
23 584,2 1 835,3
a The suffix M/C is optionally allowed.

6 Tapered bead seat rims (MT type)

6.1 Rim contours

Dimensions and tolerances of tapered bead seat rims shall be as shown in Figure 3 and as given in Table 3.

The well contours of MT2.50 and wider rims, however, are permitted to be between those shown in Figure 3
(basic contours) and Figure 4.

NOTE For D and DH, see 6.3.

Figure 3 — 5° tapered bead seat rim contours (MT type)

© ISO 2009 – All rights reserved 5

ISO/DIS 4249-3

Table 3 — Dimensions of tapered bead seat rims

Dimensions in millimetres

Nominal A B C Ea G H R1 R2 R3 R4 R5 b R6 R7
rim width
code tol. min. tol. tol. min. min. max. ± 0,5 min. ± 0,5 ± 0,5

MT 1.50 38 +1 7,5 6,5 — — 10 ± 0,5 8 3 7 2,5 — 3 — —

–0,5
MT 1.60 40,5 9 8,5 10 +0,5 12 12,5 2,5 3 2,5
0
MT 1.85 47 10,5 12c 14 9 3d
MT 2.15 55 13 +2
0
MT 2.50 63,5 +1,5 +1 12 5,5
–1 –0,5
MT 2.75 70 14
MT 3.00 76 15 13
MT 3.50 89
MT 3.75 95 16
MT 4.00 101,5
MT 4.25 108
MT 4.50 114,5
MT 5.00 127
MT 5.50 140
MT 6.00 152,5
MT 6.25 159
MT 6.50 165
MT 7.00 178
MT 7.50 190,5
MT 8.00 203
MT 8.50 216
MT 9.00 228,5
MT 9.50 241,5
MT10.00 254
MT10.50 266,5
MT11.00 279,5
MT11.50 292
MT12.00 305
MT12.50 317,5
MT13.00 330
MT13.50 343
a E = hump location. See Figure 6 and Table 5 for rims without humps.
b For MT 2.50 and larger rims, the well contour may be a rounded shape with R = full radius. See Option 2, Figure 5.
c For MT1.85, 10.5 +0.5/-0 is also permitted for better tyre mounting.
d 5±0.5 of R4 for MT2.15 is also permitted. In that case, α is to be 17°±2.5°

6 © ISO 2009 – All rights reserved

 ISO/DIS 4249-3

Key
R full radius

Figure 4 — Well contour — Option 1

6.2 Bead seat contours

Bead seat contours for rims without hump shall be as shown in Figure 6 and as given in Table 5.

Rims without hump shall only be used with tyres for tube-type applications.

Figure 5 — Bead seat contours for rims without hump

© ISO 2009 – All rights reserved 7

ISO/DIS 4249-3

Table 4 — Bead seat contours for rims without hump

Dimensions in millimetres

P
Nominal rim width code
+2
0

MT 1.50 4
MT 1.60 5
MT 1.85 8
MT 2.15 11

6.3 Rim diameter and hump circumference

The nominal rim diameter code, specified rim diameter and hump circumference shall be as given in Table 5.

Annex A provides a procedure that may be used for determining the measuring rim diameter and the
measuring rim circumference when an 8 mm ball tape is used for checking MT rims.

Table 5 — Specified rim diameters and hump circumferences for MT rim contours
Dimensions in millimetres

Nominal rim Specified rim Hump

diameter code diametera circumference
D πDH
+2
−1

13 M/C 332,2 1 041,5

14 M/C 357,6 1 121,3
15 M/C 383 1 201,2
16 M/C 406 1 273,4 b
17 M/C 433,8 1 360,7
18 M/C 459,2 1 440,5
19 M/C 484,6 1 520,3
20 M/C 510 1 600,1
21 M/C 535,4 1 679,9
23 M/C 584,7 1 837,8

NOTE “M/C” suffix for nominal rim diameter codes 16 M/C and above
is optional for rims manufactured before May 2003.
a The tolerance on the bead seat periphery is +1,5
mm.
–0,5
b For code 16 M/C, the tolerance on the bead seat periphery is ± 1 mm.

7 Permitted rim widths

7.1 Permitted rim widths for the code-designated series of motorcycle tyres shall be in accordance with
Table 6.

NOTE For permitted rim widths for the metric series of motorcycle tyres, see ISO 5751-3.

8 © ISO 2009 – All rights reserved

 ISO/DIS 4249-3

Table 6 — Permitted rim widths

Tyre section Permitted rim widthsa

2.00 1.10; 1.20; 1.35
2.25 1.20; 1.35; 1.40; 1.50; 1.60
2.50 1.35; 1.40; 1.50; 1.60
2.75 1.40; 1.50; 1.60; 1.85
3.00 1.60; 1.85; 2.15
3.25 1.85; 2.15; 2.50
3.50 1.85; 2.15; 2.50
3.75 1.85; 2.15; 2.50
4.00 2.15; 2.50; 2.75; 3.00
4.25 2.15; 2.50; 2.75; 3.00
4.50 2.15; 2.50; 2.75; 3.00
5.00 2.50; 2.75; 3.00; 3.50
a MT contours may also apply. The measuring rim width for a given tyre section shall be obtained in accordance
with ISO 4249-1:1985, Table 3.

© ISO 2009 – All rights reserved 9

ISO/DIS 4249-3

Annex A
(informative)

Rim circumference measurement — Tapered bead seat (MT type) rims

The bead seat rim circumference measurements shall be made using a tape gauge the length of which is
related to a mandrel with diameter DM.

0
The tolerance on this diameter is –0,15 mm.

To ensure accuracy, each bead seat shall be measured separately.

When an 8 mm ball tape is used for checking tapered bead seat rims, the dimensions given in Figure A.1 and
Table A.1 apply.

Dimensions in millimetres

a Specified rim diameter.

Figure A.1 — Rim circumference measurement

10 © ISO 2009 – All rights reserved

 ISO/DIS 4249-3

Table A.1 — Rim circumference measurement

Dimensions in millimetres

Diameter Circumference
Nominal rim diameter DM πDM
code
+1,5
–0,5

13 M/C 331,53 1 041,5

14 M/C 356,93 1 121,3
15 M/C 382,33 1 201,1
16 M/C 405,33 1 273,4a
17 M/C 433,13 1 360,7
18 M/C 458,53 1 440,5
19 M/C 483,93 1 520,3
20 M/C 509,33 1 600,1
21 M/C 534,73 1 679,9
23 M/C 584,03 1 834,8
a For code 16 M/C, the tolerance on the circumference is ± 1 mm.

© ISO 2009 – All rights reserved 11

ISO/DIS 4249-3

Bibliography

[1] ISO 3911, Wheels and rims for pneumatic tyres — Vocabulary, designation and marking

[2] ISO 4000-2, Passenger car tyres and rims — Part 2: Rims

[3] ISO 4249-2, Motorcycle tyres and rims (Code-designated series) — Part 2: Tyre load ratings

[4] ISO 5751-3, Motorcycle tyres and rims (metric series) — Part 3: Range of approved rim contours

12 © ISO 2009 – All rights reserved