Bsi bs au 050 1 4 4b 1992 (2000) iso 4251 5 1992

BRITISH STANDARD BS AU 50 1 4 4b 1992 ISO 4251 5 1992 Incorporating Amendment No 1 to BS AU 50 1 4 4a 1992 (Renumbers the BS as BS AU 50 1 4 4b 1992), not published separately Tyres and wheels — Part[.]

ISO 4251-5:

1992

Incor por a ting

A mend ment No 1 to

B S A U50-1-4.4a :19 2

(R en mber s the B S a s

B S A U 50-1-4.4b:

19 2), not publshed

s pa r a tely

ICS 6 0 0.0 ; 8 1 0.3

This Bri sh Stan ard, ha ing

b en pre ared u der the

directonof the Automo ile

Stan ards Policy Commi e ,

waspublished u der the

authoriyof the Stan ards

Bo rdan comes

into efect on

1 Octo er1 9

© BSI 0 -2 0

The folowing BSI references

relate to the work on this

stan ard:

Commi e reference AUE/4

Draft for comment 9 / 82 5 DC

The prep ration of this British Stand rd was entrusted b the Automobi e

Stand ards Pol cy Commit e ( AUE/-) to Tech ical Commit e AUE/4, upon

which the fol owing bod ies were represented :

Ag ricultural Eng ine r ’ Association

Automobi e Association

British Industrial Truck Association

British Pres ure Gaug e Man facturer ’ Association

British Rub er Man facturer ’ Association

Bus and Coach Cou ci

Dep rtment of Transport

Freig ht Transport Association

Institute of Road Transport Eng ine r ( Inc)

Motor Cy cle Ind ustry ’s Association of Great Britain Ltd

Motor Ind ustry Resear h Association

National Ty re Distributor ’ Association

Retrea Man facturer ’ Association

Roa Haulag e Association Ltd

Roy al Automobie Club

Society of Motor Man facturer and Tra er Ltd

Am endm ents is ued sinc publ cation

10 6 Ma 19 9 Indicated b a sidelne in the marg in

Pag e

Ta le 1 — Ty re siz s, rim width codes and dimensions 1

Ta le 2 — Basic ty re loa s ( BTL) and cor esponding inflation

Ta le 3 — Ty re load s at d iferent spe ds ( load -spe d relationship) 2

National foreword

This S bsection of this Part of BS AU5 , prep red und er the direction of the

Automobi e Stand ards Polcy Commit e , is id entical with ISO4251-5:19 2

Tyr es(ply r a ting ma r ked s r ie ) a nd r ims fr a gr icul ur a l tr a ctor s a nd

ma chine — Pa r t 5: Log skid d er tyr es, publ shed b the International

Org anization for Stand ardization ( ISO) This ed ition super ed es

BS AU5 -1-4.4 :19 2, which is withdrawn

BS AU 5 is is ued in four Parts:

— Pa r t 1: Tyr es;

— Pa r t 2: Whe ls a nd r ims;

— Pa r t 3: Va lve ;

— Pa r t 4: R im pr ofie a nd d imensions

ISO 4251 cov er requirements for ty res and rims for ag ricultural tractor an

machines.Other Parts of ISO4251 hav e be n implemented as British Stand rd s

as Subsections of BS AU5 as fol ows:

Cros - referenc s

The Tech ical Commit e has rev iewed the prov isions of ISO42 3-1 to which

normativ e reference is ma e in the text and has decid ed that they are ac epta le

for use in conjuction with this stand rd

A British Stand ard d oes not purport to includ e al the neces ary prov isions of a

contract User of British Stand rd s are responsible for their cor ect a plcation

Com pl anc with a British Standard does not ofitself confer im m unity

f om leg al o l g ations

Part 1: Tyr e d esigna tions a nd d imensions Part 1: S bsection 4.1

Part 2: Tyr e loa d r a tings Part 1: S bsection 4.2

Part 4: Tyr e cla ssifica tion a nd nomencla tur e Part 1: S bsection 4.3

Sum mary of pag es

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

p g es1 and2, an inside b ck cov er and a b ck cov er

This stand rd has be n up ated ( se copy rig ht d ate) an ma hav e ha

1 Scope

This p rt of ISO 4251 sets out the desig nation,

d imensions,loa rating s an rim co rd ination of ply

rating marked series of log skid er ty res of diag onal

construction

Rim dimensions are g iv en in ISO4251-3

The fol owing stand ard s contain prov isions which,

throug h reference in this text, constitute prov isions

of this p rt of ISO4251 At the time of publ cation,

the ed itions indicated were v ald All stand rds are

subject to rev ision, and p rties to ag re ments b sed

on this p rt of ISO4251 are encourag ed to

inv estig ate the pos ibi ity of a ply ing the most

recent editions of the stand ards ind icated below

Member of IEC and ISO maintain reg ister of

cur ently v ald International Stand rds

ISO 42 3-1:19 9, Definiions o some ter ms us d in

the tyr e ind ustr y — Pa r t 1: Pneuma tic tyr es

ISO 4251-1:19 2, Tyr es (ply r a ting ma r ked s r ie )

a nd r ims fr a gr icul ur a l tr a ctor s a nd

ma chine — Pa r t 1: Tyr e d esigna tion a nd

d imensions

ISO 4251-3:19 5,Tyr es a nd r ims (existng s r ie ) fr

a gr iculur a l tr a ctor s a nd ma chine — Pa r t 3: R ims

3 Definitions

For the purposes of this p rt of ISO4251, the

d efinitions g iv en in ISO42 3-1 and the fol owing

d efinitions a ply

3.1

log g ing servic tyre

special desig n ag ricultural ty re suita le for forestry

a plcation

3.2

basic tyre lo d for lo skidder

ma imum loa of total v ehicle mas with

ac es ories plus load inc eases d ue to log winching

or g ra plng load s an mas trans er that is

imposed on an ind iv idual ty re due to total rad ial

for es d uring operation

4 Ma rking

The marking of ply rating marked series of ty res for

log skidd er shal consist of desig nations of the ty re

siz an ply rating and the d istinctiv e marking LS;

ad ditional information shal be as specified in

ISO4251-1

5 Dimensions and tolerances

Stand rd siz s, measurement rims, d esig n

d imensions of new, diag onal construction log

skidd er ty res, of both normal an low section heig ht,

and ma imum ty re dimensions in serv ice shal be as

g iv en inTa le 1

6 Tyr load ra ting s

6.1Basic ty re loa s for log skid der ty res of diag onal

construction, an normal an low section heig ht, for

a ma imum spe d of3 km/ h are g iv en inTa le 2

The load s g iv en are ma imum v alues and are v al d

for the inflation pres ures indicated

Ta le 1 — Tyre sizes, rim width co es and dim ensions

Dimensions in milimetres

Tyr siz

desig nation

Measur m ent rim

width co e

a

Se tion width Ove al diam ete

b

Ma im um o e al

width

Ma im um o e al

diam ete

Norm al se tion heig ht tyr s

Low se tion heig ht tyr s

a

S id er man facturer should recog nize that sp cialized tyres wih de p r tre d an cor esp n ing inc e sed ov eral diameter

ma b used

b

Minimum new ty re o eral d iameter is calculated on the b sis of a tolerance of –3% on desig n secton heig ht

Ta le 2 — Basic tyre lo ds (BTL) and cor esponding inflation pres ures (IP)

6.2 For log g ing operations with a ma imum spe d

of8km/h, ty re load s ma be inc eased to1 0% of

the v alues g iv en inTa le 2 with no inc ease in

inflation pres ure

6.3 For transport serv ice and operations which do

not req uire sustained hig h torq ue, the loa s at

v arious spe ds g iv en inTa le 3 a ply with no

chang e in inflation pres ure

Ta le 3 — Tyre loa s at diferent spe ds

( o d-spe d relationship)

7 Rims

7.1 Rim contour

Se ISO 4251-3

7.2 Rim co rdination

In a dition to the measurement rim width g iv en

inTa le 1, the a prov ed rim contour are g iv en

inTa le 4 for ty res for log skid er with normal and

low section heig ht

Consult rim and whe l man facturer for

confirmation of the streng th of rim/whe l for the

intend ed serv ice

8 Tubes

W henev er an inner tube is req uired, it shal be

identified b the same desig nation as the siz of the

ty re in which it is to be mou ted

Table 4 — Appro ed rim contour

Tyr siz desig nation

BT

kg

IP

kPa

BT

kg

IP

kPa

BT

kg

IP

kPa

BT

kg

IP

kPa

Norm al se tion heig ht tyr s

Low se tion heig ht tyr s

Ma im um spe d

km/ h

Ma im um tyr lo d

a

a

Ex res ed as a p r entag e of the b sic tyre lo ds g iv en

inTa le 2

Tyr siz

desig nation

Measur m ent rim

width co e

Appro ed rim

contours

Norm al se tion heig ht tyr s

24.5 – 32 LS 2

DW 2 A

DH 2

Low se tion heig ht tyr s

3 5 L – 32 LS 27

DW 27 A

DH 27

List ofreferences

Se national foreword

ISO 4251-5:

1992

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