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

BRITISH STANDARD AUTOMOBILE SERIES BS AU 50 1 3 2b 1997 ISO 4250 2 1995 Including Amendment 1 1997 Tyres and wheels — Part 1 Tyres — Section 3 Off the road tyres — Subsection 3 2b Specification for na[.]

ICS 5 1 0; 8 1 0.3 ; 8 1 0.9

This BritishStan ard, ha ing

b en pre ared u der the

directionof the Engine ring

SectorBo rd, was published

u derthe authority of the

Stan ards Bo rd an comes

into fect on

1 No emb r1 9

© BSI0 -2 0

ISBN 0 5 0 2 5 6 6

This BritishStand rd reproduces v erb tim ISO425 -2:19 5 ( includ ing

Amend ment1:19 7) an implements it as the UK national stand ard It

super ed es BS AU5 -1.3.2a:19 1 which is withdrawn

The UK p rticip tion in its prep ration was entrusted to Tech ical Commit e

AUE/4, Ty res and whe ls for motor v ehicles, which has the responsibi ty to:

— aid enq uirer to u d er tand the text;

— present to the responsible international/ European commit e any

enquiries on the interpretation, or proposals for chang e, and ke p the UK

interests informed;

— monitor related international an European dev elopments and

promulg ate them in the UK

A lst of org anizations represented on this commit e can be obtained on

req uest to its sec etary

Cros - referenc s

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Sum m ary of pag es

This d ocument comprises a f ont cov er, an insid e font cov er, p g esi andi ,

theISO title p g e, p g es i to iv , p g es1 to1 and a b ck cov er

This stand rd has be n upd ated ( se copy rig ht d ate) and ma hav e had

amend ments incorporated This wi l be indicated in the amendment ta le on

the inside f ont cov er

Am endm ents is ued sinc publ cation

7 Loa ca acities for earth-mov er ty res on

Ta le 1 — Diag onal ply rating marked nar ow b se

ty res for earth-mov ing slow spe d serv ice, reference

Ta le 2 — Diag onal ply rating marked nar ow b se

ty res for earth-mov ing serv ice for relativ ely short hauls,

Ta le 3 — Diag onal ply rating marked wide b se

ty res for earth-mov ing slow spe d serv ice, reference

Ta le 4 — Diag onal ply rating marked wide b se

ty res for earth-mov ing serv ice for relativ ely short hauls,

Ta le 5 — Diag onal ply rating marked6 series ty res

Ta le 6 — Diag onal ply rating marked ty res in g rad er

Ta le 7 — Diag onal ply rating marked ty res,

Ta le 8 — Diag onal ply rating marked ty res for

Ta le 9 — Sy mbol marked nar ow b se rad ial ty res,

Ta le 10 — Sy mbol marked wide b se rad ial ty res,

Ta le 1 — Sy mbol marked nar ow b se ra ial ty res,

Ta le 1 — Sy mbol marked wide b se rad ial ty res,

Ta le 13 — Sy mbol marked6 series ra ial ty res for

Ta le 14 — Sy mbol marked ra ial ty res for comp ctor

serv ice— Reference spe d10km/h ( loa ed cond itions) 1

Ta le 15 — Sy mbol marked ra ial ty res in g ra er serv ice,

Ta le 16 — Loa ca acities for earth-mov er ty res on

Desc iptors: Civil engine ring , self-pro eled machines, e rth-mo ing e uipment, tyres, pneumatic

tyres,lo ds ( for es), lo d ca acity, internal pres ure

© BSI 0 -2 0

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Foreword

ISO ( the International Org anization for Stand rdization) is a worldwide

federation of national stand ards bodies ( ISO member bodies) The work of

prep ring International Stand ards is normaly car ied out throug h ISO tech ical

commit e s Each member bod interested in a subject for which a tech ical

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commit e International org anizations, g ov ernmental and non-g ov ernmental,

in l aison with ISO,also take p rt in the work ISO col a orates closely with the

International Electrotechnical Commis ion ( IEC) on al mat er of

electrotech ical stand ardization

Draft International Stand rds a opted b the tech ical commit e s are

cir ulated to the member bod ies for v oting Publcation as an International

Stand ard requires a prov al b at least7 % of the member bod ies casting a v ote

International Stand ard ISO425 -2 was prep red b Tech ical Commit e

ISO/TC31, Tyres, r ims a nd va l ve , S bcommit e SC6, Off-the-r oa d tyres a nd

rims

This third edition cancels an replaces the secon ed ition ( ISO425 -2:19 1), of

which it constitutes a technical rev ision

ISO425 consists of the fol owing p rts, u der the g eneral title Ea rth-mo er

tyres a nd rims:

— Pa rt1: Tyre d esigna tion a nd d imensions;

— Pa rt2: Loa d s a nd infl a tion pres ures;

— Pa rt3: R ims

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1 Scope

ISO425 consists of thre p rts ( se the Foreword)

lay ing d own the tech ical desig nation and

dimensions of ty res an rims for earth-mov er ; it

also g iv es loa ta les for these ty res

This p rt of ISO425 g iv es working definitions of

mas es and load cy cles,an specifies ty re loa s an

reference inflation pres ures for nar ow and wid e

b se ty res primariy intend ed for earth-mov er

machines

NOT 1 Terms used are in ac ordance with

ISO3 7 -1:1 7 ,Tyr es,va lve a nd tube — List of equival ent

ter ms— Part1:Tyres

2 Definitions

For the purposes of this p rt of ISO425 , the

fol owing d efinitions a ply

2.1 Definitions of m as es

2.1.1

m aximum lo d

ma imum load s of indiv id ual ty res determined b

man facturer’s rated g ros machine mas ( GMM)

distribution as ig ned to each a le, d iv id ed b the

n mber of ty res for that a le

NOT 2 The ma imum GMM inclu es mas es calculated

in2.1.1.1 t o2.1.1.6 inclusiv

2.1.1.1

o erating mas ; net weig ht ( deprecated)

actual mas of the b se machine with eq uipment

specified b the man facturer, operator( 75kg ), ful

fuel tank, an ful lubricating , hy draulc and co lng

sy stems

2.1.1.2

o tional equipment mas

diference in operating mas betwe n the optional

item and stand ard item replaced ( such as eng ine,

brakes, ty res, etc.)

NOT 3 This inclu es the o erating mas of ad itional items

ofered b the man facturer which are not re lacements for

stan ard items ( such as ca s, b dy-liner ,side-b ards,

air-con itioner , etc.)

2.1.1.3

m as of spe ial m odifications

d iference in the operating mas of the machine due

to modifications not prev iously cov ered in optional

equipment mas ( such as a d itional

reinfor ements,etc.)

2.1.1.4

pa lo d

total mas of the material being car ied

2.1.1.5

tyre bal ast

( if used , this is also included in determination of

GMM.)

2.1.1.6

field m odifications

operating mas chang e d ue to machine alterations

ma e other than b the orig inal man facturer ( such

as mod ifications for a ditional ca acity ,

reinfor ements, etc.)

2.2 Definitions of o erating conditions

2.2.1

maxim um spe d

peak v elocity at ained b the machine

2.2.2

earth- m oving haulag e cycle

cy cle where machine self-oa s or receiv es a loa

f om loa ing eq uipment, transports it elsewhere

and returns u loa ed

NOT 4 Transp rtation usualy ocur o er u impro ed

suraces at medium sp eds,up to6 km/h, an short distances,

cy cle where the machine is used to pick up material

and mov e it a short distance awa

NOT 6 Tyre lo ds fluctuate de en ing on the con itions

inv lv d when the e uipment picks up the lo d

NOT 7 Transp rtation sp eds are low, up to 0km/ h,an

distances are short,usualy les than7 m awa

2.2.4

loa - car y cycle

cy cle where the machine, primariy intended for

loa er serv ice, picks up a load , transports it

elsewhere and returns u loa ed

NOT 8 Transp rtation usualy ocur o er u impro ed

suraces at low sp eds,up to 5km/ h, an short distances,up

to 0 m

NOT 9 Machines in this cate ory consist mainly of lo d er ,

lo stacker an material-han ling e uipment

NOT 1 Ty re man facturer should b consuled for sp cific

con itions

2.2.5

dozer (tractor) cycle

condition where a machine is used to mov e

materials ( usual y earth) b pushing , drag g ing or

NOT 1 Grader sp eds are slower d ring working p riods,

with ty ical transp rtation sp eds re ching a out4 km/h

NOT 1 Tra el distances v ry de en ing on work situations

2.2.7

cre p

mov ement of eq uipment at a v ery low spe d

( commonly not ov er1 0m in6 min)

NOT 1 During ce p motion, lo ds on the tyres are usualy

v ry high an consideration ne ds to b giv n to the ty e of

surace o er which the e uipment is tra eling

NOT 1 Tyre man facturer should b consuled for sp cific

con itions

2.2.8

drive-awa

mov ement of a machine f om one location to another

und er non-working conditions

NOT 1 This mo ement ocur d ring transp rtation of a

machine fom site to site

NOT 1 Tyre man facturer should b consuled for sp cific

con itions

NOT 2 Lo d/ sp ed/distance ta les in this p rt of ISO4 5 do

not a ply to driv -awa con itions

2.3 Definition of vehicle ty e

2.3.1

industrial vehicle

v ehicle includ ing cou ter-b lanced l ft trucks,

container handler , stra dle car ier , air raft tow

tractor , mobi e c usher , log stacker

3 Special conditions

For long er hauls and /or spe d s in exces of those

indicated in the ta les, the ty re man facturer

should be consulted for instructions reg ard ing

permis ible loa s and the required inflation

pres ures

4 Selection for new m achine desig n

Selection of siz and streng th ind ex of the ty re used

on each a le shal be b sed on the hig hest indiv idual

whe l load ( determined b GMM distribution,

including loa trans er) and the machine

a pl cation

Ma imum loa per ty re shal not be g reater than

specified in the a pl ca le ta les

The perormance of machines fit ed with

earth-mov er ty res depends on the operating

conditions, and more p rticularly on the specific

g rou d pres ure which is g ov erned b the inflation

pres ure It is therefore a v isa le to select ty re siz

on the b sis of low inflation pres ure

5 Infla tion pres ures — General

5.1 Rim and whe l man facturer should be

consulted to d etermine if the rim and whe l are of

suficient streng th for the intend ed serv ice

conditions ( i flation pres ure and load )

5.2 Inflation pres ures shown in the loa /i flation

ta les are reference pres ures and do not include

any pres ure buid-up due to v ehicle operation

5.3 In ag re ment with ty re man facturer , inflation

pres ures ma be v aried to compensate for extremes

of atmospheric temperature or special operating

conditions

5.4 For al ta les the inflation pres ures are g iv en

for g uid nce only ; in actual practice they ma be

v aried ac ording to the operating conditions, in

ag re ment with the ty re man facturer

6 Load/infla tion tables

Loa /i flation relations for diag onal ply rating ty res

are g iv en in Ta le 1 to Ta le 8; those for

sy mbol marked rad ial ty res are g iv en in Ta le 9 to

Ta le 15

7 Loa d ca pa cities for earth- m over

tyres on industria l vehicles

Loa ca acities for earth-mov er ty res on industrial

v ehicles are g iv en in Ta le 16

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Ta le 1 — Diag onal ply rating marked nar ow base tyres for earth-moving slow spe d servic ,

referenc spe d10km /h ( o dedconditions)

Tyr siz

desig nation

Ply rating

Lo da

For stationary service con itions,the lo ds in this ta le ma

b ince sed up to 0% with no inc e se in inflation pres ure

For sp cial e uipment with a high centre of g ra ity, consul

the tyre man facturer

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Ta le 2 — Diag onal ply rating m arked nar ow b se tyres for earth- m oving servic for relatively

short hauls, referenc spe d5 km /h

Tyr siz

desig nation

Ply rating

Lo da

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Ta le 3 — Diag onal ply rating m arked wide b se tyres for earth-moving slow spe d servic ,

referenc spe d10km /h ( o ded conditions)

Tyr siz

desig nation

Ply rating

Lo da

For stationary service con itions,the lo ds in this ta le ma

b ince sed up to 0% with no inc e se in inflation pres ure

For sp cial e uipment with a high centre of g ra ity, consul

the tyre man facturer

© BSI 0 -2 0

Ta le 4 — Diag onal ply rating m arked wide base tyres for earth-moving servic for relatively

short hauls, referenc spe d5 km /h

Tyr siz

desig nation

Ply rating

Lo da

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Ta le 5 — Diag onal ply rating m arked6 series tyres for earth- m oving servic

Ta le 6 — Diag onal ply rating m arked tyres in g ra er servic , referenc spe d 4 km /h

Tyr siz designation Ply rating

Earth-m oving se vic for

r latively short hauls,

© BSI 0 -2 0

Ta le 7 — Diag onal ply rating m arked tyres, referenc spe d 10km /h

Ta le 8 — Diag onal ply rating marked tyres for compactor servic

Tyr siz designation

“TG” is a designation to b used to identify tyres mou ted on SDC rims

Tyr siz desig nation Ply rating Lo d index S e d sym bol

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Ta le 9 — Sym bol- m arked nar ow b se ra ial

tyres, referenc spe d10km /h

( o dedconditions)

Ta le 10 — Symbol- m arked wide base ra ial

tyres, referenc spe d10km/h

The tolerance on inflation pres ure is in reco nition of the

wide v riety of service con itions encou tered

The tolerance on inflation pres ure is in reco nition of the

wide v riety of service con itions encou tered

© BSI 0 -2 0

Ta le 1 — Sym bol- m arked nar ow base

ra ial tyres, referenc spe d5 km /h

Ta le 12 — Sym bol- m arked wide base ra ial

tyres, referenc spe d5 km /h

Tyr siz

desig nation

S m bol

Lo da

Tolerance on inflation pres ure in reco nition of the wide

v riety of service con itions encou tered

Tyr siz

desig nation

S m bol

Lo da

Tolerance on inflation pres ure in reco nition of the wide

v ariety of service con itions encou tered

© BSI 0 -2 0

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Ta le 13 — Sym bolmarked6 series ra ial tyres for earth- m oving servic

Ta le 14 — Symbolmarked ra ial tyres for com pactor servic —

Referenc spe d 10km/h ( oa ed conditions)

Tyr siz desig nation S m bol

Earth-m oving se vic for

r latively short hauls, r f r nc

© BSI 0 -2 0

Ta le 15 — Symbol- m arked ra ial tyres in

g ra er servic , referenc spe d4 km/h

Ta le 16 — Lo d ca acities for earth-m over

tyres on industrial vehicles

Tyr siz designation

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