Bsi bs au 050 1 6 3a 1995 (1999) iso 6054 1 1994

BRITISH STANDARD AUTOMOBILE SERIES

Tyres and wheels —
Part 1: Tyres —
Section 6: Motorcycle tyres —
Subsection 6.3a Specification for
designations, dimensions and load
ratings for code designated series
(diameter codes 4 to 12) tyres

ICS 83. 1 60. 1 0

BS AU
50-1.6.3a:1995
ISO 6054-1:
1994


BS AU 50-1.6.3a:1995

Committees responsible for this
British Standard
The preparation of this British Standard was entrusted to Technical
Committee AUE/4, Tyres and wheels for motor vehicles, 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
Confederation of Passenger Transport UK

Department of Transport
Freight Transport Association
Institute of Road Transport Engineers (Inc)
Motor Cycle Industry’s Association of Great Britain Ltd.
Motor Industry Research Association
National Tyre Distributors’ Association
Retread Manufacturers’ Association
Road Haulage Association Ltd.
Society of Motor Manufacturers and Traders Ltd.

This British Standard, having
been prepared under the
direction of the Engineering
Sector Board, was published
under the authority of the
Standards Board and
comes into effect on
1 5 December 1 995
© BSI 09-1 999

The following BSI references
relate to the work on this
standard:
Committee reference AUE/4
Draft for comment 92/82582 DC

ISBN 0 580 24917 4

Amendments issued since publication
Amd. No.

Date

Comments


BS AU 50-1.6.3a:1995

Contents
Page
Committees responsible

Inside front cover

National foreword

ii

1

Scope

1

2

Normative reference

1

3

Definitions

1

4

Tyre designation

1

5

Tyre dimensions

1

6

Method of measurement of tyre dimensions

2

7

Load capacities and inflation pressures

4

Annex A (informative) Bibliography

6

Table 1 — Nominal rim diameter code

1

Table 2 — Section height

1

Table 3 — Tyre dimensions for nominal rim diameter
codes 4, 5, 6 and 7 — Design and in- service

2

Table 4 — Tyre dimensions for nominal rim
diameter codes 8, 9, 1 0 and 1 2 — Design and in-service

3

Table 5 — Maximum tyre load ratings and inflation pressures —
Nominal rim diameter codes 4, 5, 6 and 7

4

Table 6 — Maximum tyre load ratings and inflation pressures —
Nominal rim diameter codes 8, 9, 1 0 and 1 2

4

Table 7 — Percentage overload at other maximum speeds

5

List of references

© BSI 09-1 999

Inside back cover

i


BS AU 50-1.6.3a:1995

National foreword
Motorcycle tyres and rims
(code-designated series) — Diameter codes 4 to 12 — Part 1: Tyres,
This Subsection of this Part of BS AU 50 has been prepared by Technical
Committee AUE/4 and is identical to ISO 6054-1 : 1 994

published by

the International Organization for Standardization (ISO).

BS AU 50-1 . 6. 3a supersedes BS AU 50-1 . 6. 3: 1 991 which is withdrawn.
Other Parts of the Standard are:
—

—
—

Part 2: Wheels and rims
Part 3: Valves
Part 4: Rim profiles and dimensions
;

;

Cross-reference

.

The Technical Committee has reviewed the provisions of ISO 4223-1 , to which
normative 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 09- 1 999


BS AU 50-1.6.3a:1995

1 Scope

4.2.1 Load index

This part of ISO 6054 lays down the designation,

The load index is a numerical code associated with

dimensions, and load ratings for an
inch-code- designated series of tyres for motorcycles,
fitted on rims with a nominal diameter
corresponding to the codes 4, 5, 6, 7, 8, 9, 1 0 and 1 2.
ISO 6054-2 deals with the requirements for rims.
NOTE 1

The parallel International Standards in the metric

series are ISO 5751 - 1 [4] , ISO 5751 - 2[5] and ISO 5751 - 3[6] .

2 Normative reference
The following standard contains provisions which,
through reference in this text, constitute provisions
of this part of ISO 6054. At the time of publication,

the edition indicated was valid. All standards are

the maximum load a tyre can carry at the speed
indicated by its speed symbol under service
conditions specified by the tyre manufacturer.

4.2.2 Speed symbol

The speed symbol indicates the speed at which the
tyre can carry a load corresponding to its load index
under service conditions specified by the tyre
manufacturer.

5 Tyre dimensions

5.1 Calculation of “design tyre” dimensions
5.1.1 Design tyre overall diameter, DO

subj ect to revision, and parties to agreements based

The design tyre overall diameter is the sum of the

on this part of ISO 6054 are encouraged to

nominal rim diameter,

investigate the possibility of applying the most

section height,

recent edition of the standard indicated below.
Members of IEC and ISO maintain registers of
currently valid International Standards.

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

ISO 4223-1 : 1 989,

DO

=

Dr

H:

+ 2H

see Table 1 for the value of Dr to be used.

Table 1 — Nominal rim diameter code
Nominal rim diameter, Dr

Code

mm

For the purposes of this part of ISO 6054, the

4

1 02

definitions given in ISO 4223-1 apply.

5

1 27

4 Tyre designation

6

1 52

7

1 78

The designation of the tyre shall be shown on its

8

203

9

229

10

254

12

305

to be shown close to each other:

4.1 );
— service description (see 4.2 ).
4.1 Size dimension
— size dimension (see

The characteristics shall be indicated as follows:
Nominal
section
width code

5.1.2 Design tyre section height, H
The design tyre section height,
nominal section width,

rim diameter
code

SN,

H, corresponds to the

as shown in Table 2.

Table 2 — Section height

Nominal
—

plus twice the design tyre

For tyres marked with a nominal rim diameter code,

3 Definitions

sidewall and shall include the following markings,

Dr,

Section height, H, for rim codes
4, 5, 6 and 7
8, 9, 10 and 12

Nominal section
width, SN, code

mm

mm

4.1.1 Nominal section width

2. 50

—

67, 5

The nominal section width shall be expressed by a

2. 75

—

72, 5

3. 00

code (see Table 2 for code correlations).

4.1.2 Nominal rim diameter

The nominal rim diameter shall be expressed by a
code (see Table 1 for code correlations).

4.2 Service description

The characteristics shall be indicated as follows:
Load index

Speed symbol

3. 25

74, 5
—

3. 50

86

4. 00

99, 5

79, 5
85
91 , 5
1 06

4. 50

112

1 1 9, 5

6. 00

1 42

1 51 , 5

5.2 Calculation of “maximum overall tyre
dimensions in service”
These dimensions include protective ribs, lettering,
embellishments, manufacturing tolerances, special
tread configuration and growth due to service.

© BSI 09-1 999

1


BS AU 50-1.6.3a:1995

5.2.1 Maximum overall width in service, W

5.3 Design tyre and overall tyre dimensions

The maximum overall width in service is equal to

Table 3 and Table 4 give design tyre dimensions and

the product of the design tyre section width

overall tyre dimensions in service for the tyres of

max

the coefficient 1 , 08:

S and

W = 1 , 08S
5.2.2 Maximum overall diameter in
service, D

6 Method of measurement of tyre
dimensions

max

O, max

The maximum overall diameter in service is equal to

D , plus twice the product
of the design tyre section height, H, and the

the nominal rim diameter,
coefficient 1 , 1 :

D

O,max

=

D

r

+ 2, 2

4.1 .

which the designation is as indicated in

r

Before measuring, tyres shall be mounted on the
measuring rim, inflated to the recommended
pressure, and allowed to stand for a minimum
of 24 h at normal room temperature, after which the
inflation pressure shall be readj usted to the original

H

value.
If rims of other widths are used, the values of design
tyre section width,
in service,

W

max ,

S, and maximum overall section

shall be changed by 40 % of the

difference in rim width.

Table 3 — Tyre dimensions for nominal rim diameter codes 4, 5, 6 and 7 —
Design and in-service
Dimensions in millimetres

Tyre size
designation

3.00-5
3.00-7
3.50-4
3.50-5
3.05-6
3.50-7
4.00-5
4.00-7
4.50-6
6.00-6

2

Design tyre

Measuring rim
width

Section width

R

S

53, 5

m

80

In-service
Maximum
overall
overall
Overall diameter section width Maximum
diameter

D

276
327

W

O

86

274
63, 5

92

299
324

291
342

99

31 6
341
367
346

63, 5

1 05

76

1 20

376

1 30

398

1 01 , 5

1 54

436

1 66

464

377

O , max

291

350
326

D

max

113

397

© BSI 09- 1 999


BS AU 50-1.6.3a:1995

Table 4 — Tyre dimensions for nominal rim diameter codes 8, 9, 10 and 12 —
Design and in-service
Dimensions in millimetres

Tyre size
designation

2.50-8
2.50-9
2.75-9
2.75-10
3.00-8
3.00-10
3.00-12
3.25-12
3.50-8
3.50-9
3.50-10
3.50-12
4.00-8
4.00-10
4.00-12
4.50-12
6.00-9

© BSI 09-1 999

Design tyre

Measuring rim
width

Section width

R

S

m

38

65

44, 5

71

53, 5

80

In-service
Maximum
overall
overall
Overall diameter section width Maximum
diameter

D

338
364
374
399

max

70
77

362
41 3

88

475

63, 5

92

437

95

99

466

389
41 4
429
492
430
455
506

41 5
1 05

378

404

488
63, 5

352

480

386
41 2

O , max

378
86

464
63, 5

D

W

O

436
113

51 7

487
538

76

1 20

544

1 30

568

1 01 , 5

1 54

532

1 66

562

3


BS AU 50-1.6.3a:1995

7 Load capacities and inflation
pressures

Table 6 — Maximum tyre load ratings and
inflation pressures — Nominal rim diameter
codes 8, 9, 10 and 12

Table 5 and Table 6 give the maximum load

Tyre size designation

capacities for the corresponding inflation pressures,
with reference to a speed of 1 00 km/h. For other

Tyre size

maximum speeds, apply the percentage overload

given in Table 7.

Table 5 — Maximum tyre load ratings and
inflation pressures — Nominal rim diameter
codes 4, 5, 6 and 7
Tyre size designation
Tyre size

3.00-5
3.00-5
3.00-7
3.00-7
3.50-4
3.50-4
3.50-5
3.50-5
3.50-6
3.50-6
3.50-7
3.50-7
4.00-5
4.00-5
4.00-7
4.00-7
4.50-6
4.50-6
6.00-6
6.00-6
a

Load index
10
22
18
30
16
28
20
32
24

Maximum load capacities
for inflation pressure of
175 kPaa
250 kPaa
kg

60
—
75
—
71
—
80
—
90

kg

—

85
—
1 06
—
1 00
—
112
—

36

—

1 25

28

1 00

—

40

—

1 40

32

112

—

41

—

1 45

38

1 32

—

48

—

1 80

42

1 50

—

52

—

200

57

230

—

68

—

31 5

1 kPa = 1 0 –2 bar

2.50-8
2.50-8
2.50-9
2.50-9
2.75-9
2.75-9
2.75-10
3.00-8
3.00-8
3.00-10
3.00-10
3.00-12
3.00-12

3.25-12
3.25-12
3.50-8
3.50-8
3.50-9
3.50-9
3.50-10
3.50-10
3.50-12
3.50-12
4.00-8
4.00-8
4.00-10
4.00-10
4.00-12
4.00-12
4.50-12
4.50-12
6.00-9
6.00-9
a

4

Load index
16
28
20
30
24

Maximum load capacities
for inflation pressure of
250 kPaa
175 kPaa
kg

71
—
80
—
90

kg

—
1 00
—
1 06
—

35

—

1 21

37

—

1 28

26

95

—

38

—

1 32

32

112

—

42

—

1 50

38

1 32

—

47

—

1 75

40

1 40

—

51

—

1 95

35

1 21

—

46

—

1 70

39

1 36

—

48

—

1 80

41

1 45

—

51

—

1 95

45

1 65

—

57

—

230

44

1 60

—

55

—

21 8

49

1 85

—

60

—

250

54

21 2

—

65

—

290

61

257

—

72

—

355

69

325

—

79

—

437

1 kPa = 1 0 –2 bar

© BSI 09- 1 999


BS AU 50-1.6.3a:1995

Table 7 — Percentage overload at other
maximum speeds
Maximum speed

Overload

km/h

%

50

30

70

16

80

10

90

5

1 00

0

110

–7

1 20

– 15

1 30

– 25

© BSI 09-1 999

5


BS AU 50-1.6.3a:1995

Annex A (informative)
Bibliography

Motorcycle tyres and rims (Code designated series) — Part 1: Tyres.
Motorcycle tyres and rims (Code-designated series) — Part 2: Tyre load ratings.
Motorcycle tyres and rims (code-designated series) — Part 3: Rims .
Motorcycle tyres and rims (metric series) — Part 1: Design guides.
Motorcycle tyres and rims (metric series)— Part 2: Tyre dimensions and load-carrying
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 —

[1 ] ISO 4249-1 : 1 985,
[2] ISO 4249-2: 1 990,
[3] ISO 4249-3: —,

1)

[4] ISO 5751 -1 : 1 994,

capacities.

[5] ISO 5751 -2: 1 994,

[6] ISO 5751 -3: 1 994,

Part 2: Rims.

[7] ISO 6054-2: 1 990,

1)

6

To be published. (Revision of ISO 4249- 3: 1 990)

© BSI 09- 1 999


BS AU 50-1.6.3a:1995

List of references
See national foreword.

© BSI 09-1 999


BS AU
50-1.6.3a:1995
ISO 6054-1:
1994

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