BRITIS H S TAND ARD AUTO MO BILE S E RIE S

BS AU
5 0 -1 . 7. 1 : 1 989
IS O 5 995 -1 :
1 982

Tyres and wheels —
Part 1 : Tyres —

Section 7: Moped tyres —

Sub section 7. 1 Specification for tyre
designations, dimensions and load
ratings

[IS O title : Mop ed tyre s and rims — Part 1 : Tyres]

UDC 629. 1 1 3. 01 2. 5: (083. 3): 629. 1 1 8. 35: 006. 3/. 8

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BS AU 5 0-1 .7.1 :1 989

Committees responsible for this
British Standard

The preparation of this British Standard was entrusted by the Automobile
Standards 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
Ministry of Defence
Motor Cycle Association of Great Britain
Motor Industry Research 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 Automobile
Standards Committee, was
published under the authority
of the Board of BSI and comes
into effect on
28 February 1 989
© BSI 02- 2000

The following BSI references
relate to the work on this
standard:
Committee reference AUE/4
Draft for comment 78/71 455 DC


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Amendments issued since publication

Amd. No.

Date of issue

Comments


BS AU 5 0-1 .7.1 :1 989

Contents

Page
Committees responsib le

Inside front cover

National foreword

ii

1

Scope


1

2

Field of application

1

3

References

1

4

D efinitions

1

Section 1 . Tyre designation and dimensions
5

Tyre designation

1

6


Tyre dimensions

1

7

Method of measurement of tyre dimensions

2

Section 2 . Load ratings
8

Load capacities and inflation pressures

Annex Tyres for small cub ic capacity motorcycles and mopeds

3
6

Tab le 1 — Nominal rim diameter code

1

Tab le 2 — Section height

1

Tab le 3 — Moped tyres in highway service — D esignation
and dimensions — Rim diameter code: 1 4 to 2 2


2

Tab le 4 — Moped tyres in highway service — D esignation
and dimensions — Rim diameter code: 8 to 1 2

3

Tab le 5 — Maximum load capacity for corresponding
inflation pressure — Rim diameter code: 1 4 to 2 2

4

Tab le 6 — Maximum load capacity for corresponding
inflation pressure — Rim diameter code: 8 to 1 2
Tab le 7 — Load capacities and relevant inflation pressures
Pub lications referred to

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5
6
Inside back cover

i


BS AU 5 0-1 .7.1 :1 989


National foreword

This Subsection of this Part of BS AU 50, prepared under the direction of the
Automobile Standards Committee, is identical with ISO 5995- 1 : 1 982
(confirmed 1 987) “Mop ed

tyres and rim s — Part 1 : Tyres

” published by the

International Organization for Standardization (ISO). Other Parts of the
standard are:
—

Part 2: Wheels and rim s;

—

Part 3: Valv es.

Terminology and conventions. The text of the International Standard has

been approved as suitable for publication as a British Standard without
deviation. Some terminology and certain conventions are not identical with those
used in British Standards; attention is drawn especially to the following.
Wherever the words “International Standard” appear, referring to this standard,
they should be read as “Subsection of BS AU 50”.
The comma has been used as a decimal marker. In British Standards it is current
practice to use a full point on the baseline as the decimal marker.
Cross-references. There are no corresponding British Standards for


ISO 3833: 1 977 or ISO 4223- 1 : 1 978. The Technical Committee has reviewed the
provisions of ISO 3833 and ISO 4223- 1 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
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© BSI 02- 2000


BS AU 5 0-1 .7.1 :1 989

5.2 Service characteristics shall include the word

1 Scope

“MOPED” or “CYCLOMOTEUR” or


This International Standard establishes the
designation, dimensions, and load ratings for moped
tyres.

1)

ISO 5995- 2 will deal with requirements for rims.

2)

2 Field of application
This International Standard applies to moped tyres,
having a maximum speed of 50 km/h, fitted on rims

“CICLOMOTORE”.

6 Tyre dimensions
6.1 Calculation of “design new tyre”
dimensions
6.1 .1

Design new tyre overall diameter (

o)

D

The design new tyre overall diameter is the sum of


with a nominal diameter corresponding to the

the nominal rim diameter (Dr) plus twice the design

codes 8 – 9 – 1 0 – 1 2 – 1 4 – 1 5 – 1 6 – 1 7 – 1 8 – 1 9

new tyre section height (H):

– 22.

D

o

3 References
ISO 3833,

=

D

r

+ 2

H

For those tyres using a nominal rim diameter code,
see, in Table 1 , the value of


Ro ad vehicles — Typ es — Term s and

D

r

to be used.

Table 1 — Nominal rim diameter code

definitions.

ISO 4223- 1 ,

Nominal rim diameter
Definition of som e term s used in the tyre

C ode

D

4 Definitions

8

203

9

229


For the purposes of this International Standard, the

10

254

definitions given in ISO 4223- 1 as well as the

12

305

following definition apply.

14

356

4.1

15

381

moped

16

406


a two- wheeled or three- wheeled motor- driven

17

432

vehicle, with a maximum design speed not

18

457

exceeding 50 km/h. If the driving motor is a thermic

19

483

engine, its displacement or equivalent capacity

22

559

must not exceed 50 cm 3
[Definition given in ISO 3833]

r


mm

indus try — Part 1 : Pneum atic tyres .

6.1 .2

Design new tyre section height (

)

H

For the design new tyre section height (H)

Section 1 . Tyre designation and

corresponding to nominal section width (SN),

dimensions

see Table 2.
Table 2 — Section height

5 Tyre designation

Nominal section width

The designation shall be shown on the sidewall of

Section height


S

H

N

mm

C ode

the tyre and shall include dimensional and service
characteristics marking, and such markings shall

1 3/4

53

be close to each other.

2

56

5 .1 Dimensional characteristics shall include:

2 1 /4

63


2 1 /2

71

2 3/4

76

3

82

3 1 /4

90

5 .1 .1

Nominal section width

The nominal section width shall be expressed by a
code (see Table 2 for code correlations).
5 .1 .2

Nominal rim diameter

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

1)

2)

An International Standard is in preparation relating to a special series of moped tyres having a maximum speed of 1 00 km/h.
In preparation.

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BS AU 50-1 .7.1 :1 989

6.2 Calculation of “maximum overall (grown)

6.3 Design new tyre dimensions and overall

tyre dimensions in service”

tyre dimensions in service

These dimensions include protective ribs, lettering,

Table 3 give design new tyre dimensions in service

embellishment, manufacturing tolerances, special

for tyres designated rim diameter

tread configurations and growth due to service.


codes 1 4 to 22. Table 4 is for rim diameter codes 8

6.2.1 Maximum overall (grown) width in
service (Wmax)

to 1 2.

The maximum overall width in service is equal to
the product of the design new tyre section width (
by the coefficient 1 , 08:

W

max

= 1 , 08

S)

S

7 Method of measurement of tyre
dimensions
Before measuring, tyres shall be mounted on the
measuring rim, inflated to the recommended
pressure, and allowed to stand for a minimum

Maximum overall (grown) diameter in
service (Do max)


inflation pressure shall be readj usted to the original

The maximum overall diameter in service is equal to

value.

6.2.2

the nominal rim diameter (

D ) plus twice the
r

product of the design new tyre section height (
the coefficient 1 , 08:

D =D
o

r

+ 2, 1 6

of 24 h at normal room temperature, after which the

H) by

H


Table 3 — Moped tyres in highway service — Designation and dimensions —
Rim diameter code: 1 4 to 22
Dimensions in millimetres

Measuring
Tyre designation

Design new tyre dimensions

rim width

R

1 3/4–1 9

Section

Outer

Maximum overall

Maximum overall

width

diameter

section width

diameter


S

M

Grown tyre dimensions in service

D

D

W

max

o

o max

MOPED or
CYCLOMOTEUR

30, 5

50

589

54


597

or CICLOMOTORE
2–1 4

”

468

2–1 6

”

51 8

2–1 7

”

2–1 8

”

569

578

2–1 9

”


595

604

2–22

”

670

680

2 1 /4–1 4

”

482

492

2 1 /4–1 5

”

507

51 7

2 1 /4–1 6


”

532

2 1 /4–1 7

”

2 1 /4–1 8

”

583

593

2 1 /4–1 9

”

609

61 9

2 1 /4–22

”

685


695

2 1 /2–1 5

”

523

534

2 1 /2–1 6

”

548

559

2 1 /2–1 7

”

2 1 /2–1 8

”

599

61 0


2 1 /2–1 9

”

625

636

2 3/4–1 5

”

533

2 3/4–1 6

”

2 3/4–1 7

”

584

2 3/4–1 8

”

609


3–1 7

”

47, 0

81

596

87

609

3 1 /4–1 8

”

55

89

637

96

651

2

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34, 0

38

40, 5

47, 0

55

62

68

75

544

558

574

558

477
527
59


553

542
67

73

568

585

545
81

570
596
621

© BSI 02- 2000


BS AU 5 0-1 .7.1 :1 989

Table 4 — Moped tyres in highway service — Designation and dimensions —
Rim diameter code: 8 to 1 2
D imens ions in millimetres

Design new tyre dimensions

Grown tyre dimensions in service


Measuring
Tyre designation

2 –1 2

MO PE D or

rim width

R

Section

Outer

Maximum overall

Maximum overall

width

diameter

section width

diameter

S


M

D

W

o

D

max

3 4, 0

55

41 7

59

42 6

38

62

43 1

67


441

44, 5

70

o max

C YC LO MO TE UR
or C IC LO MO TO RE

2 1 /4–1 2

”

2 1 /2 –8

”

2 1 /2 –9

”

2 3 /4–9

”

3 –1 0

”


3 –1 2

”

356

3 45
76

3 82

3 71

44, 5

73

53, 3

84

3 81

79

41 8

393


43 1
91

469

482

Section 2. Load ratings
8 Load capacities and inflation
pressures
8.1

The load cap acities and the relevant inflation

p res sures s hown in the tab les refer to the maximum
sp eed of 5 0 km/h in the cas e of tyres marked in
accordance with

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5 .2 .

3


BS AU 5 0 -1 . 7. 1 : 1 989

Tab le 5 — Maximum load cap acity for corresponding inflation pre ssure —
Rim diame ter code : 1 4 to 2 2

Maximum lo ad cap acity, kg
Tyre de signatio n

a

Inflation pressure

b

Inflation pressure

2 5 0 kPa

1 3/4–1 9

b

2 75 kPa

MO PE D or
C YCLO MO TEUR or

80

—

C IC LO MO TO RE
2 –1 4

”


75

—

2 –1 6

”

80

—

2 –1 7

”

85

—

—

110

2 –1 7 RE INFO RCE D
2 –1 8

”


85

—

2 –1 9

”

90

—

2 –2 2

”

95

—

2 1 /4–1 4

”

90

—

2 1 /4–1 5


”

90

—

2 1 /4–1 6

”

95

—

—

1 30

1 00

—

—

1 35

2 1 /4–1 6 RE INFO RC ED
”

2 1 /4–1 7

2 1 /4–1 7 RE INFO RC ED
2 1 /4–1 8

”

1 05

—

2 1 /4–1 9

”

1 05

—

—

1 45

115

—

—

1 55

2 1 /4–1 9 RE INFO RC ED

”

2 1 /4–2 2
2 1 /4–2 2 RE INFO RC ED
2 1 /2 –1 5

”

1 05

—

2 1 /2 –1 6

”

110

—

—

1 50

2 1 /2 –1 6 RE INFO RC ED
2 1 /2 –1 7

”

115


1 55

2 1 /2 –1 8

”

1 20

—

2 1 /2 –1 9

”

1 20

—

—

1 65

2 1 /2 –1 9 RE INFO RC ED
2 3/4–1 5

”

1 20


—

2 3/4–1 6

”

1 25

—

—

1 70

1 30

—

—

1 75

2 3/4–1 6 RE INFO RC ED
2 3/4–1 7

”

2 3/4–1 7 RE INFO RC ED
2 3/4–1 8


”

1 35

—

3–1 7

”

1 45

—

—

1 95

1 75

—

3–1 7 RE INFO RCE D
3 1 /4–1 8
a
b

”

Reinforced may be replaced b y the ab breviation “RE INF”.

1 kPa = 1 0

–2

b ar

4
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BS AU 5 0 -1 . 7. 1 : 1 989

Tab le 6 — Maximum load cap acity for corre sp onding inflation pre ssure —
Rim diame te r code: 8 to 1 2
Maximum load cap acity, kg
Tyre de signation

a

Inflation pressure

b

Inflation pressure

2 50 kPa

2 –1 2


b

2 75 kPa

MO PE D or
C YCLO MO TEUR or

70

—

C IC LO MO TO RE
2 1 /4–1 2

”

80

—

2 1 /2 –8

”

75

—

—


1 05

2 1 /2 –8 RE INFO RCED
2 1 /2 –9

”

80

—

2 3/4–9

”

90

—

3–1 0

”

110

—

3–1 2


”

1 20

—

a
b

Reinforced may b e replaced b y the ab breviation “RE INF”.
1 kPa = 1 0

–2

bar

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BS AU 5 0 -1 . 7. 1 : 1 989

Annex Tyres for small cub ic capacity
motorcycles and mopeds

(not part of the Standard.)
Some tyres of similar size designation and
dimensions to those shown in Table 3 but with

different performance capabilities are
manufactured.
These tyres designed for a maximum speed
of 100 km/h have the following differences:
a) the word “MOPED” or “CYCLOMOTEUR” or
“CICLOMOTORE” is not marked on the tyre
sidewall;

b) the service characteristics indicating the
“LOAD INDEX” and the “SPEED SYMBOL” may
be marked on the tyre side wall.
NOTE Speed symbol “J” (100 km/h) would apply;

c) the load capacities and relevant inflation
pressures appropriate to a maximum speed
of 100 km/h, are shown in ;
d) the load capacities of Table 7 can be increased
by up to 30 % when the above tyres are fitted on
mopeds (max speed 50 km/h) designed for
carrying an additional passenger.
The relevant inflation pressure must be fixed by
agreement with the relevant tyre manufacturer.
7

Tab le 7 — Load cap acities and re le vant inflation pre ssures

Tyre de signation

2–16
2–17 REINF

2–18
2–19
2 1/4–15
2 1/4–16
2 1/4–16 REINF
2 1/4–17
2 1/4–17 REINF
2 1/4–18
2 1/4–19
2 1/2–16
2 1/2–16 REINF
2 1/2–17
2 1/2–17 REINF
2 1/2–18
2 1/2–19
2 1/2–19 REINF
2 3/4–16
2 3/4–17
2 3/4–17 REINF
3–17
3–17 REINF
3–18
3 1/4–18

20 J
31 J
22 J
24 J
24 J
26 J

38 J
28 J
39 J
30 J
30 J
31 J
42 J
33 J
43 J
35 J
35 J
45 J
36 J
38 J
47 J
41 J
51 J
42 J
47 J

a

Load cap acity,

80
109
85
90
90
95

132
100
136
106
106
109
150
115
155
121
121
165
125
132
175
145
195
150
175

kg

a “REINF” may be replaced by “REINFORCED” in the tyre size designation.
b 1 kPa = 10–2 bar.

6

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Inflatio n p re ssure ,

250
275
250
250
250
250
275
250
275
250
250
250
275
250
275
250
250
275
250
250
275
250
275
250
250

© BSI 02-2000



BS AU 5 0-1 .7.1 :1 989

Publications referred to

See national foreword.

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5 0-1 .7.1 :1 989
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