Bsi bs au 050 1 3 2b 1997 (2000) iso 4250 2 1995

BRITISH STANDARD AUTOMOBILE SERIES

BS AU
50-1 .3.2b:1 997
ISO 425 0-2:
1 995

Including
Amendment 1:1997

Tyres and wheels —
Part 1 : Tyres —
Section 3: Off-the-road tyres —
Subsection 3.2b Specification for
narrow and wide base tyre loads and
inflation pressures

IC S 5 3 . 1 0 0 ; 83 . 1 60 . 3 0 ; 83 . 1 60 . 9 9

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BS AU 5 0-1 .3.2b:1 997

National foreword

This British Standard reproduces verbatim ISO 4250- 2: 1 995 (including
Amendment 1 : 1 997) and implements it as the UK national standard. It
supersedes BS AU 50- 1 . 3. 2a: 1 991 which is withdrawn.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, pages ii to iv, pages 1 to 1 2 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

Amendments issued since publication

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 November 1 997
© BSI 04- 2000

ISBN 0 5 80 285 76 6

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Amd. No.

Date

Comments


BS AU 5 0-1 .3.2b:1 997

Contents

Page
National foreword
Foreword

Text of ISO 42 50- 2

©

BSI 04- 2 000

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Inside front cover
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BS AU 50-1 .3.2b:1 997

Contents
Page
Foreword

iii

1

Scope

1

2

Definitions

1

3

Special conditions

2

4

Selection for new machine design

2

5

Inflation pressures — General

2

6

Load/inflation tables

2

7

Load capacities for earth- mover tyres on
industrial vehicles

2

Table 1 — Diagonal ply rating marked narrow base
tyres for earth- moving slow speed service, reference
speed 1 0 km/h (loaded conditions)

3

Table 2 — Diagonal ply rating marked narrow base
tyres for earth- moving service for relatively short hauls,
reference speed 50 km/h

4

Table 3 — Diagonal ply rating marked wide base
tyres for earth- moving slow speed service, reference
speed 1 0 km/h (loaded conditions)

5

Table 4 — Diagonal ply rating marked wide base
tyres for earth- moving service for relatively short hauls,
reference speed 50 km/h

6

Table 5 — Diagonal ply rating marked 65 series tyres
for earth- moving service

7

Table 6 — Diagonal ply rating marked tyres in grader
service, reference speed 40 km/h

7

Table 7 — Diagonal ply rating marked tyres,
reference speed 1 0 km/h

8

Table 8 — Diagonal ply rating marked tyres for
compactor service

8

Table 9 — Symbol- marked narrow base radial tyres,

reference speed 1 0 km/h (loaded conditions)

9

Table 1 0 — Symbol- marked wide base radial tyres,
reference speed 1 0 km/h (loaded conditions)

9

Table 1 1 — Symbol- marked narrow base radial tyres,
reference speed 50 km/h

10

Table 1 2 — Symbol- marked wide base radial tyres,
reference speed 50 km/h

10

Table 1 3 — Symbol- marked 65 series radial tyres for
earth- moving service

11

Table 1 4 — Symbol- marked radial tyres for compactor
service — Reference speed 1 0 km/h (loaded conditions)

11

Table 1 5 — Symbol- marked radial tyres in grader service,

reference speed 40 km/h

12

Table 1 6 — Load capacities for earth- mover tyres on
industrial vehicles

12

Descriptors: Civil engineering, self- propelled machines, earth- moving equipment, tyres, pneumatic

tyres, loads (forces) , load capacity, internal pressure.

ii
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© BSI 04- 2000


BS AU 50-1 .3.2b:1 997

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 4250-2 was prepared by Technical Committee
ISO/TC 31,
, Subcommittee SC 6,
.
This third edition cancels and replaces the second edition (ISO 4250-2:1991), of
which it constitutes a technical revision.
ISO 4250 consists of the following parts, under the general title
:
—
—
—
Tyres,

rim s and v alv es

Off- the- road tyres and

rim s

Earth- m ov er

tyres and rim s

Part 1 : Tyre designation and dim ensions;

Part 2: Lo ads and inflation p ressures;

Part 3: Rim s.

© BSI 04-2000
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BS AU 50-1 .3.2b:1 997

1 Scope

2.1.1.5

ISO 4250 consists of three parts (see the Foreword)

tyre ballast

laying down the technical designation and

(if used, this is also included in determination of

dimensions of tyres and rims for earth- movers; it

GMM. )

also gives load tables for these tyres.

2.1.1.6

This part of ISO 4250 gives working definitions of

field modifications

masses and load cycles, and specifies tyre loads and

operating mass change due to machine alterations

reference inflation pressures for narrow and wide

made other than by the original manufacturer (such

base tyres primarily intended for earth- mover

as modifications for additional capacity,

machines.

reinforcements, etc. )

NOTE 1

Terms used are in accordance with

ISO 3877- 1 : 1 978,

Tyres,

term s — Part 1 : Tyres

v alv es and tub es — List o f eq uiv alent

.

2 Definitions
For the purposes of this part of ISO 4250, the
following definitions apply.

2.1 Definitions of masses
2.1 .1
maximum load

2.2 Definitions of operating conditions
2.2.1
maximum speed
peak velocity attained by the machine

2.2.2
earth-moving haulage cycle
cycle where machine self- loads or receives a load
from loading equipment, transports it elsewhere
and returns unloaded

maximum loads of individual tyres determined by

NOTE 4

manufacturer’s rated gross machine mass (GMM)

surfaces at medium speeds, up to 65 km/h, and short distances,

distribution assigned to each axle, divided by the
number of tyres for that axle
NOTE 2

The maximum GMM includes masses calculated

in 2.1 .1 .1 to 2.1 .1 .6 inclusive.

2.1 .1 .1
operating mass; net weight (deprecated)
actual mass of the base machine with equipment
specified by the manufacturer, operator (75 kg), full

Transportation usually occurs over unimproved

up to 4 km away.
NOTE 5

Machines in this category are mainly haulage trucks

(dumpers) and tractor- scrapers.

2.2.3
loader cycle
cycle where the machine is used to pick up material
and move it a short distance away
NOTE 6

Tyre loads fluctuate depending on the conditions

involved when the equipment picks up the load.

fuel tank, and full lubricating, hydraulic and cooling

NOTE 7

systems

distances are short, usually less than 75 m away.

2.1 .1 .2

2.2.4

optional equipment mass

Transportation speeds are low, up to 1 0 km/h, and

load-carry cycle

difference in operating mass between the optional

cycle where the machine, primarily intended for

item and standard item replaced (such as engine,

loader service, picks up a load, transports it

brakes, tyres, etc. )

elsewhere and returns unloaded

NOTE 3

NOTE 8

This includes the operating mass of additional items

offered by the manufacturer which are not replacements for
standard items (such as cabs, body- liners, side- boards,

to 600 m.

air- conditioners, etc. ) .

NOTE 9

2.1 .1 .3
mass of special modifications
difference in the operating mass of the machine due
to modifications not previously covered in optional

equipment mass (such as additional
reinforcements, etc. )

NOTE 1 0

2.2.5
dozer (tractor) cycle
condition where a machine is used to move
materials (usually earth) by pushing, dragging or

payload

NOTE 1 1

© BSI 04- 2000

Tyre manufacturers should be consulted for specific

conditions.

grading

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Machines in this category consist mainly of loaders,

logstackers and material- handling equipment.

2.1 .1 .4
total mass of the material being carried

Transportation usually occurs over unimproved

surfaces at low speeds, up to 25 km/h, and short distances, up

Tyre loads are relatively constant and speeds are low,

up to 1 0 km/h.
NOTE 1 2

Travel distances vary depending on work situations.

1


BS AU 50-1 .3.2b:1 997

2.2.6

4 Selection for new machine design

grader cycle

Selection of size and strength index of the tyre used

condition where a machine is used in construction

on each axle shall be based on the highest individual

and road maintenance

wheel load (determined by GMM distribution,

NOTE 1 3

Tyre loads are relatively constant during the work

cycles.
NOTE 1 4

Grader speeds are slower during working periods,

including load transfer) and the machine
application.

with typical transportation speeds reaching about 40 km/h.

Maximum load per tyre shall not be greater than

NOTE 1 5

specified in the applicable tables.

Travel distances vary depending on work situations.

2.2.7

The performance of machines fitted with

creep

earth- mover tyres depends on the operating

movement of equipment at a very low speed
(commonly not over 1 20 m in 60 min)
NOTE 1 6

During creep motion, loads on the tyres are usually

very high and consideration needs to be given to the type of

conditions, and more particularly on the specific
ground pressure which is governed by the inflation
pressure. It is therefore advisable to select tyre size
on the basis of low inflation pressure.

surface over which the equipment is travelling.
NOTE 1 7

Tyre manufacturers should be consulted for specific

5 Inflation pressures — General

conditions.

5.1 Rim and wheel manufacturers should be

2.2.8
drive-away

movement of a machine from one location to another
under non- working conditions
NOTE 1 8

This movement occurs during transportation of a

machine from site to site.
NOTE 1 9

Tyre manufacturers should be consulted for specific

conditions.
NOTE 20

consulted to determine if the rim and wheel are of
sufficient strength for the intended service
conditions (inflation pressure and load) .
5.2 Inflation pressures shown in the load/inflation

tables are reference pressures and do not include
any pressure build- up due to vehicle operation.
5.3 In agreement with tyre manufacturers, inflation

Load/speed/distance tables in this part of ISO 4250 do

not apply to drive- away conditions.

2.3 Definition of vehicle type

pressures may be varied to compensate for extremes

of atmospheric temperature or special operating
conditions.

2.3.1

5.4 For all tables the inflation pressures are given

industrial vehicle

for guidance only; in actual practice they may be

vehicle including counter- balanced lift trucks,

varied according to the operating conditions, in

container handlers, straddle carriers, aircraft tow

agreement with the tyre manufacturers.

tractors, mobile crushers, logstackers

3 Special conditions

6 Load/inflation tables
Load/inflation relations for diagonal ply rating tyres

For longer hauls and/or speeds in excess of those

are given in Table 1 to Table 8; those for

indicated in the tables, the tyre manufacturers

symbol- marked radial tyres are given in Table 9 to

should be consulted for instructions regarding

Table 1 5.

permissible loads and the required inflation
pressures.

7 Load capacities for earth-mover
tyres on industrial vehicles
Load capacities for earth- mover tyres on industrial
vehicles are given in Table 1 6.

2
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BS AU 50-1 .3.2b:1 997

Table 1 — Diagonal ply rating marked narrow base tyres for earth-moving slow speed service,
reference speed 1 0 km/h (loaded conditions)
Tyre size
designation

12.00 – 20

12.00 – 24
and
12.00 – 25
13.00 – 24
and
13.00 – 25
14.00 – 24
and
14.00 – 25

16.00 – 24
and
16.00 – 25

18.00 – 24
and
18.00 – 25
18.00 – 33
18.00 – 49
21.00 – 24
and
21.00 – 25

© BSI 04-2000
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Load
Ply rating

14

16
8
14
16
18
20
8
12
18
20
22
8
10
12
16
20
24
28
12
16
20
24
28
32
36
12
16
20
24
28

32
36
40
28
32
36
24
28
32
16
20
24
28

kg

5 000
5 450
4 000
5 600
6 150
6 500
6 900
4 375
5 600
7 100
7 500
8 000
4 875
5 600

6 300
7 300
8 500
9 500
10 000
7 100
8 250
9 750
10 600
11 500
12 500
13 600
8 250
10 000
11 500
12 500
13 600
15 000
16 000
17 000
16 000
17 500
18 500
18 500
20 000
21 800
11 800
13 200
15 000
16 500

a

Inflation
pressure

600
700
325
575
675
750
825
300
450
675
750
825
275
350
425
550
700
850
925
325
425
550
650
750

875
975
275
375
475
550
650
750
850
950
650
750
850
550
650
750
325
400
500
575

kPa

Tyre size
designation

21.00 – 35

21.00 – 49
24.00 – 25

24.00 – 29
24.00 – 35
24.00 – 43
24.00 – 49
27.00 – 33
27.00 – 49
30.00 – 51
33.00 – 51
36.00 – 51
40.00 – 57

Load
Ply rating

28
32
36
40
44
28
32
36
40
44
24
30
24
30
36
42

48
54
36
42
48
36
42
48
24
30
36
36
42
48
40
46
52
42
50
58
42
50
58
52
60
68

kg

19 500

21 200
23 000
24 300
25 000
23 600
25 000
27 250
29 000
30 750
18 000
20 000
19 000
21 800
26 500
29 000
31 500
34 500
30 000
32 500
34 500
32 500
34 500
37 500
22 400
25 750
29 000
36 500
40 000
43 750
45 000

48 750
53 000
51 500
56 000
61 500
58 000
65 000
71 000
80 000
87 500
92 500

a

Inflation
pressure

575
650
750
825
900
575
650
750
825
900
425
525
425

525
650
750
850
975
650
750
850
650
750
850
350
450
550
575
675
775
575
650
750
550
650
750
500
600
675
550
650
725

kPa

a For stationary service conditions, the loads in this table may

be increased up to 60 % with no increase in inflation pressure.
For special equipment with a high centre of gravity, consult
the tyre manufacturer.

3


BS AU 5 0 -1 . 3 . 2 b : 1 997

Tab le 2 — D iagonal ply rating marke d narrow b ase tyre s for e arth-moving se rvice for relatively
short hauls, refere nce spe e d 5 0 km/h

Tyre siz e
de signation

Lo ad
Ply rating

a

Inflation

Tyre siz e

p re ssure
kg

de signation

Lo ad

14

2 80 0

42 5

and 1 2 . 0 0 – 2 1

16

3 00 0

47 5

8

2 1 80

225

1 2 . 00 – 2 4

14

3 00 0

and

16

1 2 . 00 – 2 5

Inflation
p re ssure

kg

kPa

1 2 . 00 – 2 0

a

Ply rating

kPa

28

1 3 600

42 5

32

1 5 0 00

500

36

1 5 5 00

550

375

40

1 7 0 00

62 5

3 250

45 0

44

1 7 5 00

67 5

18

3 550

500

24

1 0 3 00

32 5

20

3 75 0

550

30

1 1 800

40 0

8

2 3 60

200

24

1 1 2 00

32 5

1 3 . 00 – 2 4

12

3 00 0

300

30

1 2 5 00

40 0

and

18

3 87 5

45 0

36

1 5 5 00

47 5

1 3 . 00 – 2 5

20

4 00 0

500

42

1 6 5 00

550

22

4 250

550

48

1 8 5 00

65 0

8

2 575

1 75

54

1 9 5 00

72 5

10

3 00 0

225

36

1 7 0 00

47 5

1 4. 00 – 2 4

12

3 350

2 75

42

1 9 0 00

575

and

16

4 00 0

375

48

2 0 600

65 0

1 4. 00 – 2 5

20

4 62 5

47 5

36

1 8 5 00

47 5

24

5 1 50

575

42

2 0 0 00

550

28

5 60 0

65 0

48

2 1 800

65 0

12

3 87 5

225

16

4 87 5

32 5
24

1 3 2 00

2 75

20

5 45 0

40 0
30

1 5 5 00

350

36

1 6 5 00

40 0

36

2 1 2 00

42 5

42

2 3 0 00

500

48

2 5 0 00

575

28

1 6 0 00

2 75

34

1 8 5 00

350

40

2 1 2 00

42 5

1 6. 00 – 2 4

2 1 . 0 0 – 49

2 4. 0 0 – 2 5

2 4. 0 0 – 2 9

2 4. 0 0 – 3 5

2 4. 0 0 – 43

2 4. 0 0 – 49

2 7. 00 – 33
and
1 6. 00 – 2 5

24
28

6 70 0

47 5
575

32

7 300

65 0

36

7 75 0

72 5

12
16

1 8. 00 – 2 4

6 00 0

20

4 75 0
5 60 0
6 500

2 7 . 0 0 – 49

200
2 75
350

30. 00 – 33

24

7 300

42 5

28

8 00 0

500

40

2 5 750

42 5

32

8 75 0

575

46

2 9 0 00

500

52

3 0 0 00

550

42

3 0 0 00

42 5

50

3 3 5 00

500

and
1 8. 00 – 2 5

36

1 8. 00 – 3 3

1 8. 00 – 49

2 1 . 00 – 2 4

9 250

30. 00 – 51

62 5

40

9 75 0

70 0

28

9 250

500

32

1 0 00 0

575

36

1 0 60 0

62 5

58

3 5 5 00

575

24

1 0 60 0

42 5

42

3 4 5 00

375

28

1 1 80 0

500

50

3 7 5 00

45 0

32

1 2 85 0

575

58

41 2 50

52 5

16

6 90 0

250

52

46 2 50

42 5

20

7 75 0

300

60

5 0 0 00

47 5

24

8 75 0

375

68

5 4 5 00

550

28

9 500

42 5

28

1 1 200

42 5

33. 00 – 51

3 6. 0 0 – 5 1

40 . 0 0 – 5 7

and
2 1 . 00 – 2 5

32

1 2 1 50

500

36

1 2 85 0

550

40

1 4 00 0

62 5

44

1 4 500

67 5

a

Load adj us tment for m axim um s p eed 6 5 km/h:
load

load

2 1 . 00 – 3 5

×

0, 85

Load adj us tment for m aximum s p eed 1 5 km/h:

×

1,12

Values s o calculated to b e rounded off to the neares t:
2 5 kg for loads up to 4 9 99 kg;

5 0 kg for loads from 5 00 0 kg to 9 9 99 kg;
1 00 kg for loads equal to or ab ove 1 0 00 0 kg.

4
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BS I 0 4- 2 00 0


BS AU 50-1 .3.2b:1 997

Table 3 — Diagonal ply rating marked wide base tyres for earth-moving slow speed service,
reference speed 1 0 km/h (loaded conditions)
Tyre size
designation

15.5 – 25
17.5 – 25

20.5 – 25

23.5 – 25

26.5 – 25

26.5 – 29
29.5 – 25
29.5 – 29

© BSI 04-2000
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Load
Ply rating

8
10
12
8
12
16
20
12
16
20
24
28
12
16
20
24
28
16
20
24
28
32
18

22
26
30
16
22
28
16
22
28
34
40

kg

4 250
4 875
5 600
4 750
6 150
7 300
8 250
6 700
8 250
9 500
10 300
11 500
8 000
9 500
10 900
12 500

13 600
11 500
13 200
14 000
15 500
17 000
12 850
14 500
16 000
17 500
12 850
15 000
17 500
14 000
16 000
19 000
21 200
23 600

a

Inflation
pressure

250
325
400
225
350
475

575
250
350
450
525
625
225
300
375
475
550
275
350
400
475
550
300
375
450
525
250
325
425
250
325
425
525
625

kPa

Tyre size
designation

29.5 – 35
33.25 – 29
33.25 – 35
33.5 – 33
33.5 – 39
37.25 – 35
37.5 – 33
37.5 – 39
37.5 – 51
40.5/75 – 39

Load
Ply rating

22
28
34
26
32
38
26
32
38
26
32
38

26
32
38
30
36
42
30
36
42
28
36
44
28
36
44
30
38
46

kg

17 500
20 600
23 000
20 600
23 600
25 750
22 400
25 750
28 000

22 400
25 750
29 000
24 300
27 250
30 750
28 000
30 750
33 500
28 000
31 500
34 500
29 000
33 500
37 500
33 500
38 750
42 500
31 500
37 500
42 500

a

Inflation
pressure

325
425
525

350
450
525
350
450
550
350
425
525
350
425
525
375
450
525
375
450
525
350
450
550
350
450
525
325
425
525

kPa

a For stationary service conditions, the loads in this table may

be increased up to 60 % with no increase in inflation pressure.
For special equipment with a high centre of gravity, consult
the tyre manufacturer.

5


BS AU 5 0 -1 . 3 . 2 b : 1 997

Tab le 4 — D iagonal p ly rating marke d wide b ase tyre s for e arth-moving service for re latively
short hauls, refere nce sp ee d 5 0 km/h

Tyre siz e
designatio n

1 5. 5 – 25

Load
Ply rating

a

Inflation

Tyre siz e

p re ssure
kg

de signation

Load

8

2 575

1 75

3 00 0

225

12

3 250

250

8

2 80 0

1 50

12

3 65 0

225

16

4 250

300

20

5 00 0

40 0

12

4 500

200

16

5 45 0

2 75

20

6 00 0

32 5

24

6 70 0

40 0

28

7 500

47 5

12

5 300

1 75

16

6 1 50

225

20

7 300

300

24

8 00 0

350

28

8 75 0

40 0

33. 25 – 29

33. 25 – 35

Inflation
p re ssure

kg

kPa

10

a

Ply rating

kPa

26

1 3 600

2 75

32

1 5 0 00

32 5

38

1 7 0 00

40 0

26

1 4 5 00

2 75

32

1 6 0 00

32 5

38

1 8 0 00

40 0

26

1 5 0 00

2 75

32

1 6 5 00

32 5

38

1 8 5 00

40 0

26

1 6 0 00

2 75

32

1 8 0 00

32 5

38

2 0 0 00

40 0

30

1 7 5 00

2 75

36

1 9 5 00

32 5

42

2 1 800

40 0

30

1 8 0 00

2 75

36

2 0 0 00

32 5

42

2 2 400

40 0

28

1 8 5 00

250

36

2 1 2 00

32 5

44

2 4 3 00

40 0

52

2 6 5 00

47 5

28

2 0 600

250

36

2 4 3 00

32 5

44

2 7 2 50

40 0

30

2 0 600

250

38

2 4 3 00

32 5

46

2 7 2 50

40 0

1 7. 5 – 2 5

20. 5 – 25

23. 5 – 25

33. 5 – 33

33. 5 – 39

37. 2 5 – 35

37. 5 – 33

2 6. 5 – 2 5

16

7 300

200

20

8 250

250

24

9 250

300

28
32

1 0 000

1 1 2 00

350
42 5

18

8 250

225

22

9 250

2 75

2 6. 5 – 2 9

37. 5 – 51
26

29. 5 – 25

29. 5 – 29

37. 5 – 39

1 0 3 00

32 5

30

1 1 2 00

375

16

8 00 0

1 75

22

1 0 000

250

28

1 1 5 00

32 5

16

8 500

1 75

22

1 0 600

250

28

1 2 1 50

32 5

34

1 4 000

40 0

40

1 5 000

47 5

22

1 1 5 00

250

28

1 3 600

32 5

34

1 5 000

40 0

40 . 5 /7 5 – 3 9

a

Load adj us tment for m axim um s p eed 6 5 km/h:
load

×

0, 83

Load adj us tment for m aximum s p eed 1 5 km/h:
load

×

1,12

Values s o calculated to b e rounded off to the neares t:
2 5 kg for loads up to 4 9 99 kg;
5 0 kg for loads from 5 00 0 kg to 9 9 99 kg;
1 00 kg for loads equal to or ab ove 1 0 00 0 kg.

29. 5 – 35

6
Reprodu ced by I H S u n d er l i cen se wi th BSI - U n con trol l ed Copy

©

BS I 0 4- 2 00 0


BS AU 50-1 .3.2b:1 997

Table 5 — Diagonal ply rating marked 65 series tyres for earth-moving service

Tyre size designation

Ply rating

Earth-moving service for

Earth-moving slow speed service,

relatively short hauls,

reference speed 1 0 km/h

reference speed 50 km/h

(loaded conditions)

Inflation

Load

Inflation

Load

pressure

pressure
kg

kg

kPa

kPa

12

4 375

1 75

7 300

2 50

16

5 1 50

225

8 500

32 5

20

5 800

2 75

9 750

400

16

6 700

2 00

1 0 900

2 75

20

7 500

2 50

1 2 500

350

16

7 1 00

2 00

1 1 500

2 75

20

8 2 50

2 50

1 3 2 00

350

24

9 000

300

1 5 000

42 5

24

1 1 500

2 50

1 9 000

350

30

1 2 850

300

2 1 2 00

42 5

36

1 4 500

375

2 3 600

52 5

30

—

—

2 7 2 50

375

36

—

—

3 0 000

450

45/65 – 45

38

—

—

40 000

450

50/65 – 51

46

—

—

5 1 500

450

2 5/65 – 2 5

30/65 – 2 5

30/65 – 2 9

35/65 – 33

40/65 – 39

Table 6 — Diagonal ply rating marked tyres in grader service, reference speed 40 km/h
Load

Tyre size
designation

a

1 0. 00 – 2 4 TG

Ply rating

8

1 3. 00 – 2 4 TG

1 6. 00 – 2 4 TG

1 8. 00 – 2 5

©

BSI 04- 2 000

Reprodu ced by I H S u n d er l i cen se wi th BSI - U n con trol l ed Copy

1 600

2 50
1 50

1 900

225

12

2 430

32 5

8

2 060

2 00

10

2 360

2 50

12

2 72 5

1 5. 5 – 2 5

1 7. 5 – 2 5

300

14

3 000

350

8

2 500

1 75

2 800

designation

kPa

8

10
1 4. 00 – 2 4 TG

1 700

225

12

3 075

2 75

14

3 450

32 5

16

3 650

375

Load

Tyre size

pressure
kg

6
1 2 . 00 – 2 4 TG

Inflation

2 0. 5 – 2 5

2 3. 5 – 2 5

12

3 650

225

14

4 000

2 75

16

4 500

32 5

12

4 125

2 00

a

16

5 000

2 75

SDC rims.

2 5/65 – 2 5

a

Ply rating

Inflation
pressure

kg

kPa

8

1 950

1 50

10

2 1 80

1 75

12

2 650

225

8

2 120

125

12

2 900

2 00

14

3 000

225

16

3 350

2 75

20

3 650

32 5

12

3 550

1 75

16

4 000

225

20

4 500

2 75

12

4 000

1 50

16

4 750

2 00

20

5 450

2 50

12

3 350

125

16

4 125

1 75

“TG” is a designation to be used to identify tyres mounted on

7


BS AU 5 0 -1 . 3 . 2 b : 1 997

Tab le 7 — D iagonal ply rating marke d tyre s, re fe re nce sp e ed 1 0 km/h
Inflation

Lo ad
Tyre siz e de signation

a

Ply rating

Load inde x

S p e e d symb ol

p re ssure
kg

kPa

10

1 60

A2

4 500

40 0

12

1 65

A2

5 1 50

500

1 2 . 00 – 2 4 TG

1 3 . 00 – 2 4 TG

8

1 59

A2

4 375

300

10

1 64

A2

5 00 0

375

12

1 68

A2

5 60 0

45 0

14

1 71

A2

6 1 50

52 5

16

1 73

A2

6 500

60 0

8

1 63

A2

4 87 5

2 75

10

1 68

A2

5 60 0

350

12

1 72

A2

6 300

42 5

16

1 77

A2

7 300

550

12

1 76

A2

7 1 00

32 5

16

1 81

A2

8 250

42 5

1 4. 00 – 2 4 TG

1 6. 00 – 2 4 TG

a

“TG” is a des ignation to b e us ed to identify tyres mounted on S D C rim s .

Tab le 8 — D iagonal p ly rating marked tyres for comp actor service
Lo ad
Tyre siz e de signatio n

Ply rating

Load inde x

S p e e d symb o l

Inflation
p re ssure

kg

kPa

6

129

A2

1 85 0

40 0

12

1 42

A2

2 65 0

75 0

6

1 30

A2

1 90 0

40 0

10

1 49

A2

3 250

60 0

12

1 53

A2

3 65 0

72 5

14

1 55

A2

3 87 5

80 0

10

1 53

A2

3 65 0

52 5

12

1 56

A2

4 00 0

62 5

14

1 59

A2

4 375

72 5

16

1 62

A2

4 75 0

82 5

6

1 30

A2

1 90 0

300

12

1 62

A2

4 75 0

550

14

1 65

A2

5 1 50

65 0

16

1 67

A2

5 45 0

72 5

18

1 70

A2

6 00 0

82 5

20

1 72

A2

6 300

92 5

22

1 74

A2

6 70 0

1 025

1 2 . 00 – 1 6

10

1 57

A2

4 125

45 0

1 2 . 00 – 2 0

14

1 68

A2

5 60 0

60 0

1 3 . 00 – 2 4

18

1 80

A2

8 00 0

70 0

7. 5 0 – 1 5

7. 5 0 – 1 6

8. 2 5 – 2 0

9. 00 – 2 0

1 0 . 5 /80 – 1 6

1 1 . 00 – 2 0

NO TE

For s ite- to- s ite trans fer, cons ult tyre/wheel manufacturer.

8
Reprodu ced by I H S u n d er l i cen se wi th BSI - U n con trol l ed Copy

©

BS I 0 4- 2 00 0

BS AU 50-1 .3.2b:1 997

Table 9 — Symbol-marked narrow base radial

Table 1 0 — Symbol-marked wide base radial

tyres, reference speed 1 0 km/h

tyres, reference speed 1 0 km/h

(loaded conditions)

(loaded conditions)

Tyre size
designation

12.00 R 24
and
12.00 R 25
13.00 R 24
and 13.00 R 25
14.00 R 24
and 14.00 R 25
16.00 R 24
and 16.00 R 25
18.00 R 24
and 18.00 R 25

18.00 R 33
18.00 R 49
21.00 R 24
and 21.00 R 25
21.00 R 35
21.00 R 49
24.00 R 35
24.00 R 43
24.00 R 49
27.00 R 33
27.00 R 49
30.00 R 51
33.00 R 51
36.00 R 51
37.00 R 57
40.00 R 57

Symbol

÷
÷÷
÷÷÷
÷÷
÷÷÷
÷÷
÷÷÷
÷
÷÷
÷
÷÷

÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷

Load

Inflation

kg

kPa
tol. ± 15 % a

5 150
6 900
7 300
8 000
8 500

9 500
10 000
9 000
12 150
11 800
16 000
18 500
23 000
20 600
24 300
29 000
30 750
34 500
37 500
37 500
45 000
56 000
65 000
80 000
82 500
100 000

pressure

550
800
950
800
950
800

950
550
800
550
800
800
800
800
800
800
800
800
800
800
800
800
800
800
800
800

a The tolerance on inflation pressure is in recognition of the

wide variety of service conditions encountered.

Tyre size
designation

15.5 R 25
17.5 R 25

20.5 R 25
23.5 R 25
26.5 R 25
26.5 R 29
29.5 R 25
29.5 R 29
29.5 R 35
33.25 R 29
33.25 R 35
33.5 R 33
33.5 R 39
37.25 R 35
37.5 R 33
37.5 R 39
37.5 R 51
40.5/75 R 39

Symbol

÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷

÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷

Load

Inflation

kg

kPa tol.a
± 15 %

5 800
7 100
7 100
8 500
9 500
11 500
12 150
14 500
15 000
18 500
16 000
19 500
18 000
22 400
19 500
23 600
21 200
25 750
23 600
29 000
25 750
31 500
25 750
31 500
28 000

34 500
31 500
37 500
31 500
37 500
33 500
41 250
37 500
46 250
37 500
46 250

pressure

475
600
475
600
475
600
475
600
475
600
475
600
475
600
475
600

475
650
475
650
475
650
475
650
475
650
475
650
475
650
475
650
475
650
475
650

a The tolerance on inflation pressure is in recognition of the

wide variety of service conditions encountered.

© BSI 04-2000
Reprodu ced by I H S u n d er l i cen se wi th BSI - U n con trol l ed Copy

9

BS AU 5 0 -1 . 3 . 2 b : 1 997

Tab le 1 1 — S ymb ol-marke d narrow b ase

Tab le 1 2 — S ymb ol-marked wide b ase radial

radial tyres, refere nce spe ed 5 0 km/h

tyre s, re fere nce sp ee d 5 0 km/h

Lo ad
Tyre siz e
de signation

12.00 R 24
and 12.00 R 25
13.00 R 24
and 13.00 R 25
14.00 R 20
and 14.00 R 21
14.00 R 24
and 14.00 R 25
16.00 R 20
and 16.00 R 21
16.00 R 24
and 16.00 R 25
18.00 R 24
and 18.00 R 25
18.00 R 33

18.00 R 49
21.00 R 24
and 21.00 R 25
21.00 R 35
21.00 R 49
24.00 R 35
24.00 R 43
24.00 R 49
27.00 R 33
27.00 R 49
30.00 R 51
30.00 R 51
36.00 R 51
37.00 R 57
40.00 R 57

a

p re ssure

S ymb ol

÷÷
÷÷÷
÷÷
÷÷÷
÷
÷÷
÷÷
÷÷÷

÷
÷÷
÷
÷÷
÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷
÷÷

Inflation

kg

4 000
4 250
4 750
4 875

3 750
5 000
5 600
5 800
5 150
6 900
5 450
7 300
7 100
9 250
10 900
13 600
12 150
14 500
17 500
18 500
20 600
21 800
21 800
27 250
33 500
38 750
46 250
53 000
60 000

a Load adjustment for maximum speed 65 km/h:
load × 0,88

kPa tol.b

± 15 %

650
700
650
700
450
650
650
700
450
650
450
650
450
650
650
650
650
650
650
650
650
650
650
650
650
650
650
725

725

Load adjustment for maximum speed 15 km/h:
load × 1,12
Values so calculated to be rounded off to the nearest:
25 kg for loads up to 4 999 kg;
50 kg for loads from 5 000 kg to 9 999 kg;
100 kg for loads equal to or above 10 000 kg.
b Tolerance on inflation pressure in recognition of the wide
variety of service conditions encountered.

10

Reprodu ced by I H S u n d er l i cen se wi th BSI - U n con trol l ed Copy

Lo ad
Tyre siz e
de signation

15.5 R 25
17.5 R 25
20.5 R 25
23.5 R 25
26.5 R 25
26.5 R 29
29.5 R 25
29.5 R 29
29.5 R 35
33.25 R 29
33.25 R 35

33.5 R 33
33.5 R 39
37.25 R 35
37.5 R 33
37.5 R 39
37.5 R 51
40.5/75 R 39

S ymb ol

÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷

÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷

a

Inflation
p re ssure

kg

3 550
4 500
4 125
5 450
5 600
7 300

7 100
9 250
9 000
11 500
9 500
12 500
10 900
14 000
11 500
15 000
12 500
16 000
14 000
18 500
15 500
20 000
15 500
20 000
16 500
21 800
18 500
23 600
18 500
24 300
20 000
25 750
22 400
29 000
22 400
29 000

a Load adjustment for maximum speed 65 km/h:
load × 0,88

kPa tol.b
± 15 %

350
475
350
475
350
475
350
475
350
475
350
475
350
475
350
475
350
500
350
500
350
500
350

500
350
500
350
500
350
500
350
500
350
500
350
500

Load adjustment for maximum speed 15 km/h:
load × 1,12
Values so calculated to be rounded off to the nearest:
25 kg for loads up to 4 999 kg;
50 kg for loads from 5 000 kg to 9 999 kg;
100 kg for loads equal to or above 10 000 kg.
b Tolerance on inflation pressure in recognition of the wide
variety of service conditions encountered.
© BSI 04-2000


BS AU 50-1 .3.2b:1 997

Table 1 3 — Symbol-marked 65 series radial tyres for earth-moving service

Tyre size designation

Earth-moving service for

Earth-moving slow speed service,

relatively short hauls, reference

reference speed 1 0 km/h

speed 5 0 km/h

(loaded conditions)

Symbol

Inflation

Load

Inflation

Load

pressure

pressure
kg

÷
÷÷

÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷
÷
÷÷

2 5 /65 R 2 5

3 0 /65 R 2 5

3 0 /65 R 2 9

3 5 /65 R 3 3

40 /65 R 3 9

45 /65 R 3 9

45 /65 R 45

5 0 /65 R 5 1

kg

kPa

kPa

5 80 0

32 5

1 0 60 0

47 5

7 75 0

45 0

1 2 85 0

62 5

8 00 0

32 5

1 5 00 0

47 5

1 0 600

45 0

1 8 00 0

62 5

8 500

32 5

1 6 00 0

47 5

1 1 5 00

45 0

1 9 00 0

62 5

1 3 600

350

2 3 00 0

500

1 7 5 00

500

27 250

65 0

1 8 5 00

350

31 500

500

—

—

37 500

65 0

2 3 600

350

40 00 0

500

—

—

—

—

2 5 0 00

350

42 5 0 0

500

—

—

5 0 00 0

65 0

3 1 5 00

350

54 500

500

—

—

65 00 0

65 0

Table 1 4 — Symbol-marked radial tyres for compactor service —
Reference speed 1 0 km/h (loaded conditions)
Load
Tyre size designation

Load index

Speed symbol

Inflation
pressure

kg

kPa

7. 5 0 R 1 5

1 43

A2

2 72 5

80 0

8. 2 5 R 1 5

1 46

A2

3 0 00

80 0

1 0. 00 R 2 0

1 66

A2

5 3 00

95 0

1 4. 00 R 2 4

1 89

A2

1 0 3 00

90 0

1 1 /80 R 2 0

1 61

A2

4 62 5

1 00 0

1 3/80 R 2 0

1 70

A2

6 0 00

90 0

1 7/80 R 2 4

1 95

A2

1 2 1 50

85 0

NO TE

©

For s ite- to- s ite trans fer, cons ult tyre/wheel manufacturer.

BS I 0 4- 2 00 0

Reprodu ced by I H S u n d er l i cen se wi th BSI - U n con trol l ed Copy

11


BS AU 5 0 -1 . 3 . 2 b : 1 997

Tab le 1 5 — S ymb ol-marke d radial tyres in
grade r se rvice , re fe re nce spe e d 4 0 km/h

Tyre siz e de signation

a

S ymb ol

÷
÷
÷
÷
÷
÷
÷
÷
÷
÷
÷

10.00 R 24 TG
12.00 R 24 TG
13.00 R 24 TG
14.00 R 24 TG
16.00 R 24 TG
18.00 R 25
15.5 R 25
17.5 R 25
20.5 R 25
23.5 R 25
25/65 R 25

Lo ad

Inflation

kg

p re ssure

1 950
2 575
3 000
3 650
4 625
5 600
3 000
3 650
4 625
6 000
5 000

375
375
375
375
375
375
300
300
300
300
300

kPa

a “TG” is a designation to be used to identify tyres mounted on SDC rims.
Tab le 1 6 — Load cap acitie s for e arth-mover
tyre s on industrial vehicle s
Maximum sp e e d whe n
loade d

Static
Creep
5 km/h
10 km/h
15 km/h
20 km/h
25 km/hd

O ff-road

+ 60 %
+ 30 %
+ 13 %
0
–7%
– 12 %
– 15 %

a

bc

H ard imp rove d
surface s

+ 80 %
+ 60 %
+ 45 %
+ 35 %
+ 30 %
+ 27 %
+ 25 %

NOTE For intermediate speeds, interpolations are permitted.
a Inflation pressure for off-road service: use 10 km/h reference speed tables.
b Inflation pressure for hard improved surfaces: use 10 km/h pressure × 1,2.
c For steer-wheel loads on lift trucks, multiply “hard improved surface” load
ratings by 0,8.
d For speeds above 25 km/h, consult the tyre manufacturer.

12

Reprodu ced by I H S u n d er l i cen se wi th BSI - U n con trol l ed Copy

© BSI 04-2000