Bsi bs au 050 4 3 1a 1998 (iso 4250 3 1997)

BRITISH STANDARD AUTOMOBILE SERIES

BS AU
50-4-3.1 a:
1 998
ISO 425 0-3:
1 997

Tyres and wheels —
Part 4: Rim profiles and dimensions —
Section 3: Off-the-road rims —
Subsection 3.1 a Specification for
narrow and wide base off-the-road
vehicle rims

IC S 43 . 0 40 . 5 0

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BS AU 5 0-4-3.1 a:1 998

National foreword

This British Standard reproduces verbatim ISO 4250- 3: 1 997 and implements
it as the UK national standard. It supersedes BS AU 50- 4- 3. 1 : 1 991 , which is
withdrawn.
The UK participation in its preparation was entrusted to Technical Committee
AUE/4, Tyres and wheels for motor vehicles, which has the responsibility to:
— aid enquirers to understand the text;
— present to the responsible international/European committee any

enquiries on the interpretation, or proposals for change, and keep the UK
interests informed;
— monitor related international and European developments and
promulgate them in the UK.
A list of organizations represented on this committee can be obtained on
request to its secretary.
Cross-references

The British Standards which implement international or European
publications referred to in this document may be found in the BSI Standards
Catalogue under the section entitled “International Standards Correspondence
Index”, or by using the “Find” facility of the BSI Standards Electronic
Catalogue.
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,
the ISO title page, page ii, pages 1 to 1 1 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.

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 January 1 998
© BSI 04- 1 999

ISBN 0 5 80 2941 8 8

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Amendments issued since publication

Amd. No.

Date

Comments


BS AU 5 0-4-3.1 a:1 998

Contents

Page
National foreword
Foreword

Inside front cover
ii

1

Scope

1

2

Rim identification

1

3

Rim contours

1

4

Rim knurling

1

5

Rim load and inflation pressures

1

6

Rim dimensions

1

Annex A (informative) Sealing ring grooves and O- rings for
earth- mover rims

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10

Figure 1 — Contours of 5° full tapered bead seat rims

2

Figure 2 — Contours of 5° full tapered bead seat rims

4

Figure 3 — Contours of semi- drop- centre rims

5

Figure 4 — Contours of 1 5° drop- centre rims

6

Figure 5 — Contours of 5° drop- centre rims

7

Figure 6 — Transverse knurling details

8

Table 1 — Contours of 5° full tapered bead seat rims

3

Table 2 — Contours of 5° full tapered bead seat rims

4

Table 3 — Contours of semi- drop- centre rims

5

Table 4 — Contours of 1 5° drop- centre rims

6

Table 5 — Contours of 5° drop- centre rims

7

Table 6 — Knurling widths for rim

8

Table 7 — Earth- mover specified rim diameters

9

i


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blank


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BS AU 5 0-4-3.1 a:1 998

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.
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.
International Standard ISO 4250-3 was prepared by Technical Committee
ISO/TC 31,
Subcommittee SC 6,
Tyres,

rim s and v alv es,

Off- the- road tyres and

rim s.

This second edition cancels and replaces the first edition (ISO 4250-3:1987), of
which it constitutes a technical revision.
ISO 4250 consists of the following parts, under the general title

Earth- m ov er tyres

and rim s:

—
—
—
Annex A of this part of ISO 4250 is for information only.
Part 1 : Tyres des ignations and dim ensions;

Part 2: Lo ads and inflatio n p res sures;

Part 3: Rim s.

Descriptors:

designation.

Site equipment, self-propelled machines, earth-moving equipment, rims, dimensions,

ii
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© BSI 04-1999


BS AU 50-4-3.1 a:1 998

Loose flanges shall be marked on an externally

1 Scope
ISO 4250 consists of three parts (see the Foreword)
laying down the technical elements relating to
designation and dimensions of tyres and rims for
earth- moving machinery: it also gives load tables for

visible surface. The marking shall indicate nominal
height and nominal diameter.

3 Rim contours

Rim contours are given in Figure 1 to Figure 5 and

these tyres.
This part of ISO 4250 sets out the designation,
contours and dimensions for rims for narrow and
wide base off- road tyres primarily intended for

Table 1 to Table 5.

4 Rim knurling

earth- moving machinery.

Rim knurling details are given in Figure 6 and

Annex A gives details of sealing ring grooves and

Table 6.

O- rings for earth- mover rims.
NOTE

Terms used are in accordance with ISO 391 1 : 1 977,
/

Wh eels rim s — No m enclature, designatio n, m arking and u nits o f
m eas urem ent.

manufacturer’s recommendations, even though the
tyre may be approved for a higher load or inflation

2.1 Codes shall be used to identify:

(see Table 6);

D

b) nominal width between flanges;
c) nominal flange height or rim profile
designations.
2.2 The rim marking shall consist of codes for:

a) specified rim diameter,

The load and inflation pressure imposed on the rim
and wheel shall not exceed the rim and wheel

2 Rim identification

a) specified rim diameter,

5 Rim loads and inflation pressures

D

;

b) nominal width between flanges.

pressure. Consult the rim and wheel manufacturer

to determine if rim and wheel capacities are
adequate for the intended service.

6 Rim dimensions
Rim dimensions are standardized for size and
contour only, and for particular tyre and rim
combinations designated to ensure proper mounting
and fit of the tyre to the rim.

The markings shall be on the weather side of the rim
and visible when the tyre is mounted on the rim
Where a disk is fitted by the rim/wheel
manufacturer, the marking shall appear on either
the disc or rim base.

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1


BS AU 5 0-4-3.1 a:1 998

NO TE 1

The figure applies to rim diameter codes 25, 29, 33, 35, 39, 43, 45, 49, 51 and 57. (See Table 7 for specified rim diameters. )

NO TE 2

Flange and bead seat shall be removable on one side.

Figure 1 — Contours of 5 ° full tapered bead seat rims

2
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© BSI 04- 1 999


BS AU 50-4-3.1 a:1 998

Table 1 — C ontours of 5 ° full tapered bead seat rims
D imens ions in millimetres

A

G

B

P

± 13

± 2

min.

min.

Rim width code/flange
height code

R

2

tol.

1 1 . 2 5 /2 . 0

2 86

51

32, 5

1 01

32

± 1,5

1 3 . 0 0 /2 . 5

330

63 , 5

45 , 5

1 01

38

± 1,5

330

70

48, 5

1 01

47, 5

± 1,5

1 5 . 0 0/3 . 0 0

3 81

76

55

1 1 7, 5

44, 5

± 1,5

1 5 . 00/3 . 0 –49

3 81

76

55

1 1 7, 5

51

± 2

1 7 . 0 0/2 . 0

43 2

51

32, 5

1 01

32

± 1,5

1 7 . 0 0/3 . 5

43 2

89

58

1 39

51

± 2

1 9 . 5 0/2 . 0

495 , 5

51

32, 5

1 01

32

± 1,5

1 9 . 5 0/2 . 5

495 , 5

63 , 5

45 , 5

1 01

38

± 1,5

1 9 . 5 0/4. 0

495 , 5

1 01 , 5

66

1 39

57

± 2

2 0 . 0 0/2 . 0

508

51

32, 5

1 01

32

± 1,5

2 2 . 0 0/3 . 0

559

76

55

1 39

44, 5

± 1,5

2 2 . 0 0/4. 0

559

1 01 , 5

66

1 39

57

± 2

2 2 . 0 0/4. 5

559

1 1 4, 5

74

1 39

63 , 5

± 2

2 2 . 00/4. 5 –5 1

559

114

74

1 90 , 5

63 , 5

± 2

2 4. 0 0/3 . 0

609 , 5

76

55

1 39

44, 5

± 1,5

2 4. 0 0/5 . 0

609 , 5

127

86, 5

1 90 , 5

70

± 2

2 5 . 0 0/3 . 5

63 5

58

1 39

51

± 2

2 6. 00/5 . 0 –5 1

660 , 5

86, 5

1 90 , 5

70

± 2

2 7 . 0 0/3 . 5

686

58

1 39

51

± 2

2 7 . 0 0/6. 0

686

9 7, 5

1 90 , 5

84

± 2, 5

2 8. 0 0/3 . 5

71 1

58

1 39

51

± 2

2 8. 0 0/4. 0

71 1

1 01 , 5

66

1 39

57

± 2

2 9 . 0 0/6. 0

73 6, 5

1 52, 5

9 7, 5

1 90 , 5

84

± 2, 5

3 1 . 0 0/4. 0

787 , 5

1 01 , 5

66

1 39

57

± 2

3 2 . 0 0/4. 0

81 3

1 01 , 5

66

1 39

57

± 2

3 2 . 0 0/4. 5

81 3

1 1 4, 5

74

1 39

63 , 5

± 2

3 6. 0 0/4. 5

91 4, 5

1 1 4, 5

74

1 39

63 , 5

± 2

1 1 4, 5

74

1 39

63 , 5

± 2

1 3 . 0 0/2 . 7 5

a

40 . 0 0/4. 5
a

1 01 6

89

127

89

1 52, 5

89

For rim diameter code > 49 .

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BS AU 5 0-4-3.1 a:1 998

NOTE 1

This figure applies to rim diameter code 25 (see Table 7 for specified rim diameters) .

NOTE 2

Flange and brad seat shall be removable on one side.

Figure 2 — Contours of 5 ° full tapered bead seat rims
Table 2 — C ontours of 5 ° full tapered bead seat rims
Dimensions in millimetres

A

Rim width code/flange

G

height code

tol .

tol.

B

P

min.

min.

R

R

2

± 1,5

8. 50/1 . 3

21 6

± 5

33

± 1,5

25, 5

50

23

8

1 0. 00/1 . 5

254

± 5

38

± 1,5

28

59

25, 5

8

1 2. 00/1 . 3

305

± 6, 5

33

± 1,5

25, 5

47

23

10

1 4. 00/1 . 5

355, 5

± 6, 5

38

± 1,5

28

59

25, 5

10

1 7. 00/1 . 7

432

± 13

43

± 2

25, 5

60

23

4
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3

max.

8

© BSI 04- 1 999


BS AU 50-4-3.1 a:1 998

NOTE 1

This figure applies to rim diameter codes 24 and 25 (see Table 7 for specified rim diameters) .

NOTE 2

Flange and bead seat shall be removable on one side

Figure 3 — Contours of semi-drop-centre rims
Table 3 — Contours of semi-drop-centre rims
Dimensions in millimetres

A

Rim width
code/flange height
code

tol.

G

B

P

H

± 1,5

min.

min.

min.

R

2

Rim diameter
code

± 1,5

8. 00 TG SDC

203

± 3, 5

35, 5

1 7, 5

47

1 6, 5

24

1 0. 00 VA SDC

254

± 5

43

25, 5

59

11

23

24

1 2. 00/1 . 3 SDC

305

± 6, 5

33

25, 5

47

7

23

25

1 4. 00/1 . 3 SDC

355, 5

± 6, 5

33

25, 5

47

7

23

25

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6, 5

5


BS AU 5 0-4-3.1 a:1 998

NOTE

This figure applies to rim diameter codes 56, 5 and 59, 5 (see Table 7 for specified rim diameters) .

Figure 4 — Contours of 1 5 ° drop-centre rims
Table 4 — Contours of 1 5 ° drop-centre rims
Dimensions in millimetres

A

B

± 10

min.

Rim width code

Ha

La

Q

P

max.

min.

R2

R3

R4

max.

max.

R5a

20. 0

508

57

1 09, 5

1 06

201 , 5

1 20, 5

32

1 9, 5

44, 5

32

22. 0

559

57

1 09, 5

1 57

201 , 5

1 20, 5

32

1 9, 5

44, 5

32

23. 5

597

66, 5

1 31 , 5

111

248

1 52

41

25, 5

48

38, 5

27. 0

686

66, 5

1 31 , 5

200

248

1 52

41

25, 5

48

38, 5

a

These dimensions comprise the minimum well envelope for tyre mounting purposes of dimension

6
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Q.

© BSI 04- 1 999


BS AU 50-4-3.1 a:1 998

NOTE

The figure applies to rim diameter codes 24 and 25 (see Table 7 for specified rim diameters) .

Figure 5 — Contours of 5° drop-centre rims
Table 5 — Contours of 5 ° drop-centre rims
Dimensions in millimetres

A

Rim width

G

B

P

H

L

Q

R1

R2

code flange

R3

R4

R5

height code

tol.

tol.

min.

max. min.

min.

min.

max.

0

max.

Rim
diameter

+ 3

code

min.

9. 00/1 . 5

228, 5

± 5, 0

38

± 1,5

25

36

49

48

25, 5

1 02

19

8

14

22

24 max. 24

1 0. 00/1 . 3

254

± 6, 0

33

± 1,5

25

40

49

45

25, 5

1 02

23

10

12

17

1 5 min.

24

1 2. 00/1 . 3

305

± 6, 5

33

± 1,5

25

40

40

45

30

90

23

10

12

17

1 5 min.

25

1 3. 00/1 . 4

330

± 6, 5

36

± 1,5

25

40

40

48

30

1 02

23

10

12

17

1 5 min.

25

1 4. 00/1 . 3

355, 5

± 6, 5

33

± 1,5

25

40

40

45

30

90

23

10

12

17

1 5 min.

25

1 4. 00/1 . 5

355, 5

± 6, 5

38

± 1,5

27

43

40

52

30

90

25, 5 1 0

12

17

1 5 min.

25

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BS AU 5 0-4-3.1 a:1 998

Figure 6 — Transverse knurling details
Table 6 — Knurling widths for rim
D imensions in millimetres

Knurling width
Rim width codes

Fixed flange side

Removable flange side

2 5 min.

51 max.

a) Rim diameter codes 2 5 to 49
1 1 . 2 5 to 1 5. 00

38 min.
1 7. 00 and ab ove

67 max.

67 max.

38 min.

38 min.

67 max.

67 max.

53, 5 min.

53, 5 min.

b ) Rim diameter codes 51 and larger
2 2 . 00 and ab ove

8
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BS AU 5 0 -4 -3 . 1 a:1 998

Tab le 7 — E arth-mover sp ecifie d rim
diamete rs

Rim diame te r co de s

S p e cifie d d iame te r,

D

mm

24

61 4, 4

25

63 5 , 0

29

73 6, 6

33

83 8, 2

35

889, 0

39

990, 6

43

1 0 92 , 2

45

1 1 43 , 0

49

1 2 44, 6

51

1 2 95 , 4

57

1 447 , 8

5 6. 5

1 43 5 , 1

5 6. 5

1 51 1 , 3

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BS AU 50-4-3.1 a:1 998

Annex A (informative)
Sealing ring grooves and O-rings for
earth-mover rims

10
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© BSI 04- 1 999


BS AU 50-4-3.1 a:1 998

Dimensions in millimetres
Rim base

DB

Rim size

;DB

Bead seat ring

R

r

tol.

11-20 SDC
12-20 SDC
13-20 SDC
10.00VA-24 SDC
16.00T-24 SDC
8.00TG-24 SDC
8.50-25/1.3
10.00-25/1.5
11.23-25/1.3
12.00-25/1.3
14.00-25/1.5
17.00-25/1.7
12.00-25/1.3 SDC
14.00-25/1.3 SDC
11.25-25
13.00-25
15.00-25
16.00-25
17.00-25
19.50-25
20.00-25
22.00-25
24.00-25
25.00-25
– 29
– 33
– 35
– 39
– 43
– 45

– 49
– 51
– 57

487,4

T1

DR

; DR

± 0,3

1 531,2

T2
tol.

488,6

L

!

Proposed
O-ring
designation

+2

0

1 535

OR 220
± 1,2

589

1 850,4 ± 1,2

590,2

1 854,2
OR 224

600

609,6

1 885

1,6
601,2
max.
3,2
3,2

1 915,1 ± 2,4

610,8

1 888,8
1,2 5°

5

1 918,9 ± 2,4
OR 225

620,6

1 949,7 ± 1,2

621,8

1 953,4 ± 1,2

600

1 885

602

1 891,2

+ 1,2
– 2,4 4,8

OR 325

+ 1,2
– 2,4 1,6 2°

5,6

7

1,6

1
1
1
1
1

701,6
803,2
854,1
955,7
057,3
108,1
209,7
244,6
397

2 204,1
2 523,3
2 683,2
3 002,4
3 321,6

3 481,2
3 800,4
3 910 ± 2,4
6,4
4 388,8

1
1
1
1
7,2
1

703,6
805,2
856,1
957,7
059,3
110,1
211,7
246,6
399

2 210,4
2 529,6
2 689,5
3 008,7
3 327,9
3 487,5
3 806,7

3 916,3 2,4
4 395,1

OR 329
OR 333
OR 335
OR 339
OR 343
OR 345
OR 349
OR 451
— 15° 9,5
OR 457

NOTE O-ring size, shape and properties should provide a lasting positive seal.

© BSI 04-1999
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11


BS AU
5 0-4-3.1 a:1 998
ISO 425 0-3:

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1 997
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