Bsi bs au 050 4 6 3 1991 (2000) iso 6054 2 1990

BRITISH STANDARD

BS AU
50-4.6.3:1 991
ISO 6054-2:
1 990

Tyres and wheels —
Part 4: Rim profiles and dimensions —
Section 6: Motorcycle rims —
Subsection 6.3 Specification for code
designated series (diameter codes 4
to 1 2) rims


BS AU 5 0-4.6.3:1 991

Committees responsible for this
British Standard

The preparation of this British Standard was entrusted by the Automobile
Standards Policy Committee (AUE/- ) to Technical Committee AUE/4, upon
which the following bodies were represented:
Agricultural Engineers’ Association
Automobile Association
British Industrial Truck Association
British Pressure Gauge Manufacturers’ Association
British Rubber Manufacturers’ Association
Bus and Coach Council
Department of Transport
Freight Transport Association

Institute of Road Transport Engineers (Incorporated)
Motor Cycle Industry’s Association of Great Britain Ltd.
Motor Industry Research Association
National Tyre Distributors’ Association
Retread Manufacturers’ Association
Road Haulage Association Ltd.
Royal Automobile Club
Society of Motor Manufacturers and Traders Ltd.

This British Standard, having
been prepared under the
direction of the Automobile
Standards Policy Committee,
was published under the
authority of the Standards
Board and comes
into effect on
31 January 1 992
© BSI 01 - 2000

The following BSI references
relate to the work on this
standard:
Committee reference AUE/4
Draft for comment 89/75746 DC

ISBN 0 5 80 203 77 8

Amendments issued since publication

Amd. No.

Date

Comments


BS AU 5 0-4.6.3:1 991

Contents

Page
Committees responsible
National foreword

ii

1

Scope

1

2

Normative reference

1

3

Finish

1

4

Designation

1

5

Divided rims

1

6

Drop centre rims

1

7

Tapered bead seat rims (MT type)

1

8

Recommended rim widths

1

9

Rim circumference measurement

1

Annex A (normative) Rim circumference measurement

6

Figure 1 — Divided rim contour

2

Figure 2 — Drop centre rims — Contour dimensions

3

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

4

Figure 4 — Bead seat contours for MT rims without hump

5

Table 1 — Divided rims — Contour dimensions

2

Table 2 — Divided rims — Diameters

3

Table 3 — Drop centre rims — Contour dimensions

3

Table 4 — Drop centre rims — Diameters

4

Table 5 — Dimensions of tapered bead seat rims

4

Table 6 — Bead seat contours for MT rims without hump

5

Table 7 — Recommended rim widths

5

Table A. 1 — Mandrel diameters and tape circumferences

6

Publication(s) referred to

© BSI 01 - 2000

Inside front cover

Inside back cover

i


BS AU 5 0-4.6.3:1 991

National foreword

This Subsection of this Part of BS AU 50, prepared under the direction of the
Automobile Standards Policy Committee, is identical with ISO 6054- 2: 1 990
“Motorcycle tyres and rims (code-designated series) — Diameter codes 4 to 12 —
Part 2: Rims”, published by the International Organization for Standardization
(ISO). The corresponding tyre details are dealt with in Part 1 (Subsection 6. 3) .
Other Parts of the standard are:
—

Part 1: Tyres;

—

Part 2: Wheels and rims;

—

Part 3: Valves.

Part 4 of BS AU 50 (covering rim profiles and dimensions) has been introduced to
assist cross- referencing between tyre specifications and the corresponding rim
specifications. Subsections of Part 4 will partially supersede the information
contained in BS AU 50- 2. 1 b: 1 980 which has been amended accordingly.
Cross-references

The Technical Committee has reviewed the provisions of ISO 391 1 , to which
reference is made in the text, and has decided that they are acceptable for use in
conj unction with this standard.
A British Standard does not purport to include all the necessary provisions of a
contract. Users of British Standards are responsible for their correct application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii,
pages 1 to 6, an inside back cover and a back cover.
This standard has been updated (see copyright date) and may have had
amendments incorporated. This will be indicated in the amendment table on the
inside front cover.

ii

© BSI 01 - 2000


BS AU 50-4.6.3:1 991

1 Scope

5 Divided rims

This part of ISO 6054 lays down rim dimensions for

5.1 Rim contours

an inch- code- designated series of motorcycle tyres
for diameter codes 4 to 1 2 . It sets only those rim
contour dimensions necessary for the mounting and
fitment of the tyre to the rim.

1)

D imensions and tolerances for divided rims shall b e
as given in Table 1 and Figure 1 .

5.2 Rim diameters

Tyre designations, dimensions and load ratings are

The rim diameter code and specified rim diameters

given in ISO 6054- 1 .

shall be as given in Table 2 .

2 Normative reference

6 Drop-centre rims

The following standard contains provisions which,

6.1 Rim contours

through reference in this text, constitute provisions

D imensions and tolerances for drop- centre rims

of this part of ISO 6054. At the time of publication,

shall b e as given in Table 3 and Figure 2 .

the edition indicated was valid. All standards are
subj ect to revision, and parties to agreements b ased

6.2 Rim diameters

on this part of ISO 6054 are encouraged to

The rim diameter code and specified rim diameters

investigate the possibility of applying the most

shall be as given in Table 4.

recent edition of the standard indicated b elow.
Members of IEC and ISO maintain registers of

7 Tapered bead seat rims (MT type)

currently valid International Standards.

7.1 Rim contours

Wheels /rims — Nomenclature,
designation, marking and units of measurement.

D imensions and tolerances for tapered b ead seat

ISO 391 1 : 1 977,

3 Finish
3.1 Rim contour

rims shall be as given in Tab le 5 and Figure 3.

7.2 Bead seat contours
Bead seat contours for MT rims without hump shall
be as given in Table 6 and Figure 4.

The rim on the side of the tyre shall have a smooth
contour free of sharp edges.

3.2 Rim valve hole
Valve hole edges on the tyre side of rims shall be

8 Recommended rim widths
The recommended rim widths are indicated in
Table 7.

rounded or chamfered. O n the hub side, the edges
shall be free of burrs, which could damage the valve.

4 Designation

9 Rim circumference measurement
Information on rim circumference measurement is
given in Annex A.

The rim shall b e designated, in accordance with
ISO 391 1 , by its nominal diameter code and
nominal rim width code.
EXAMPLE

8 × 2.1 0

1)

Further study is to cover harmonization of rim dimensions and tolerances for 2 . 5 0 C , 3. 00 D and 4. 00 E rims, in the future

Industrial tyres and rims — Part 1: Pneumatic tyres (metric series) on 5° tapered or flat base rims — Designation,
dimensions and marking, ISO 42 51 - 3: 1 985, Tyres and rims (existing series) for agricultural tractors and machines —
Part 3: Rims and this part of ISO 6054.

ISO 3739- 1 ,

© BSI 01 - 2 000

1


BS AU 5 0-4.6.3:1 991

1)

See below Table 1 .

Figure 1 — Divided rim contour
Table 1 — Divided rims — C ontour dimensions
Dimensions in millimetres
Nominal rim
width code

A

B

± 1,5

min.

1 .5 0

38

1 .75

44, 5

2.1 0

53, 5

2.1 5

b

54, 5

2.5 0 C

63, 5

3.00 D

76

3.5 0 D

89

4.00 E
4.00 D
5 .00 D

a
b

2

1 01 , 5
1 27

G
+1
–0,5

1 0, 5
7

9, 5

P

C

min.

ref.

a

12

R

10

15
16
1 7, 5

11,5

1 2, 5

14
16

R

3

max.

R

8

F

1

max.

min.

2
7

7

12
8, 5

R

2

10

1 2, 5

11,5

12

1 2, 5

13

20

1 8, 5

1 3, 5

14

1 7, 5

16

1 2, 5

13

8, 5

2, 5
3

5

3, 5

—

8
11

7, 5

9

14

11

4, 5
6, 5
6, 5

max.

1 0, 5

14

1 2, 5

16

11

16

For off- centre naves (rims which are split off- centre) where the value is the minimum width for tapered bead seat.
For nominal rim diameter code 8 only.

© BSI 01 - 2000


BS AU 5 0-4.6.3:1 991

Table 2 — Divided rims — Diameters

Dimensions in millimetres
Nominal rim

Specified rim diameter

D

diameter code

4
5
6
7
8
9
10

100,8
126,2
151,6
177
202,4
227,8
253,2

Figure 2 — Drop-centre rims — Contour dimensions
Table 3 — Drop-centre rims — C ontour dimensions

Dimensions in millimetres

A

Nominal
rim width

B
tol.

code

min.

G
max.

tol.

+1
–0 , 5

2.1 5 LF

38
47
55

2.5 0 C

63,5

± 1,5 10

13,5 16

+1
–0 , 5

3.00 D

76

± 1,5 11

15,5 17,5

3.5 0 D

89

± 1,5 11,5 15,5 17,5

1 .5 0
1 .85 LF

© BSI 01-2000

H

L

P

min.

min.

min.

8

10
11
13

4
8
11

13,5

12,5

+1
–0 , 5

18

+1

–0 , 5

18

7,5 11,5 10,5 ± 0,5

9

C

R2

R3

R4

R5

max.

min.

min.

R1

5,5
6,5

7

2

12

11,5 12

3

17,5

14

12,5 13

4,5

19

15

12,5 13

4,5

3

3
7,5
max.

6,5
6,5

8
8

3


BS AU 50-4.6.3:1 991

Table 4 — Drop-centre rims — Diameters

Dimensions in millimetres
Nominal rim

Specified rim diameter

D

diameter code

8
9
10
12

202,4
227,8

253,2
304

Figure 3 — 5 ° tapered bead seat rim contours (MT type)
Table 5 — Dimensions of tapered bead seat rims

Dimensions in millimetres

A

Nominal
rim width

tol.

code

1 .85 MT
2.1 5 MT
2.50 MT
2.75 MT
3.00 MT
3.50 MT
aE=

4

B

47

55
63,5
70
76
89

C

min.

min.

tol.

10,5

+1
–0 , 5

+ 1 ,5
–1

G

Ea

±

H

R1

min.

min.

R2

R3
max.

0,5 11,5

R

R4
±

0,5

R6

5

min.

±

0,5

R7
±

0,5

3

13
9

10,5

14
15

14

+1
–0 , 5

12

3

12,5 2,5

3

3

2,5

5,5
13

Hump location.

© BSI 01-2000


BS AU 5 0 -4. 6. 3 : 1 991

Tab le 7 — Recommended rim widths
Nominal se ction
w idth,

SN

Re co mme nd e d rim widths

C od e

Figure 4 — Be ad se at contours for
MT rims without hump

2.50
2.75
3.00
3.25
3.50

4.00
4.50
6.00

1.50 – 1.75 – 1.85
1.50 – 1.75 – 1.85 – 2.10 – 2.15
1.85 – 2.10 – 2.15 – 2.50
2.10 – 2.15 – 2.50
2.10 – 2.15 – 2.50
2.15 – 2.50 – 3.00
3.00
4.00

Tab le 6 — Be ad se at contours for
MT rims without hump

Dimensions in millimetres

P

+2
0

Nominal rim w idth code

1.85 MT
2.15 MT
2.50 MT
2.75 MT
3.00 MT

3.50 MT

© BSI 01-2000

8
11
13

5


BS AU 50-4.6.3:1 991

Annex A (normative)
Rim circumference measurement
The bead seat rim circumference measurements shall be made using a tape gauge the length of which is
related to a mandrel diameter which is derived from the specified rim diameter. Mandrel diameter and tape
circumferences are presented in Table A. 1 .
The tolerance on the mandrel diameter is

0
– 0, 05

mm.

Table A.1 — Mandrel diameters and tape circumferences
Dimensions in millimetres

Nominal rim
diameter code

Tape circumference

Mandrel
diameter

D

min.

; (D – 0. 4)

M

max.

; (D + 0. 4)

4

99, 97

31 2, 8

31 5, 3

5

1 25, 37

392, 6

395, 1

6

1 50, 77

472, 4

474, 9

7

1 76, 1 7

552, 2

554, 9

8

201 , 57

632

634, 5

9

226, 97

71 1 , 8

71 4, 3

10

252, 37

791 , 6

794, 1

12

303, 1 7

951 , 2

953, 7

a

b

a

Ball tape diameter: 1 0 mm. Ball sizes other than 1 0 mm may be used if suitable alterations to

the mandrel diameter and circumference dimensions are made.
b

6

; = 3, 1 41 59

© BSI 01 - 2000


BS AU 50-4.6.3:1 991

Publication(s) referred to
See national foreword.

© BSI 01 - 2 000


BS AU
5 0-4.6.3:1 991
ISO 6054-2:

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1 990
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