BRITISH STANDARD AUTOMOBILE SERIES BS AU 50 1 4 2b 1999 ISO 4251 2 1998 Tyres and wheels — Part 1 Tyres — Section 4 Agricultural tractor and machine tyres — Subsection 4 2b Specification for load rati[.]
Trang 1ISO 4251-2:
1998
ICS 6 0 0.0 ; 8 1 0.3
Trang 2This Bri sh Stan ard, ha ing
b en pre ared u der the
directonof the Eng ine ring
SectorCommi e , was
publishedu der the authoriy
ofthe Stan ards Commi e
an comes into efect on
1 Mar h1 9
© BSI0 -1 9
ISBN 0 5 0 3 7 1 9
This British Stand rd reproduces v erb tim ISO4251-2:19 8 and implements
it as the UK national stand rd It super edes BSAU5 -1-4.2a:19 3 which is
withd rawn
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
The British Stand rds which implement international or European
publcations refer ed to in this document ma be fou d in the BSI Stand ards
Catalog ue u der the section entitled “ International Stand ards Cor espondence
Index”, or b using the “Find” faci ity of the BSI Stand rd s Electronic
Catalog ue
A British Stand rd do s not purport to include al the neces ary prov isions of
a contract User of British Stand ard s are responsible for their cor ect
a pl cation
Compl anc with a British Standard does not of itselfconfer imm unity
f om leg al o l g ations
Sum m ary of pag es
This document comprises a f ont cov er, an inside font cov er, p g es i and i ,
the ISO title p g e, p g ei , p g es1 to10 an 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
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i
Pag e
Annex A ( i formativ e) Ty res on nominal rim d iameter
Ta le 1 — Ag ricultural driv e whe ls — Tractor ty res ( diag onal
construction — normal section heig ht) — Basic ty re load s ( BTL) for
a ma imum spe d of3 km/ h and reference inflation pres ures ( IP) 2
Ta le 2 — Ag ricultural driv e whe ls — Tractor ty res ( diag onal
construction — low section heig ht) — Basic ty re loa s ( BTL) for
a ma imum spe d of3 km/ h and reference inflation pres ures ( IP) 3
Ta le 3 — Ag ricultural d riv e whe ls — Tractor ty res — Ty re loa s
Ta le 4 — Ag ricultural d riv e whe ls — Tractor ty res used as duals
( diag onal construction — normal section heig ht) — Loa per ty re ( L)
for a ma imum spe d of3 km/h an reference inflation pres ures ( IP) 4
Ta le 5 — Ag ricultural d riv e whe ls — Tractor ty res used as duals
( diag onal construction — low section heig ht) — Loa per ty re ( L) for
a ma imum spe d of3 km/ h and reference inflation pres ures ( IP) 5
Ta le 6 — Ag ricultural driv e whe ls — Tractor ty res for special
cultiv ation work ( d iag onal and rad ial construction) — Basic ty re
loa s ( BTL) for a ma imum spe d of3 km/ h an reference
Ta le 7 — Ag ricultural driv e whe ls — Tractor ty res for special
cultiv ation work ( diag onal and rad ial construction) — Ty re loa s ( L)
for special cultiv ation work at a ma imum spe d of10km/h and
Ta le 8 — Ag ricultural ste ring whe ls — Tractor ty res ( diag onal
construction — normal section heig ht) — Basic ty re load s ( BTL) for
a ma imum spe d of3 km/ h and reference inflation pres ures ( IP) 6
Ta le 9 — Ag ricultural ste ring whe ls — Tractor ty res ( diag onal
construction — low section heig ht) — Basic ty re loa s ( BTL) for
a ma imum spe d of3 km/ h and reference inflation pres ures ( IP) 6
Ta le 10 — Ag ricultural ste ring whe ls — Tractor ty res — Ty re
Ta le 1 — Ag ricultural implement ty res ( diag onal construction —
normal section heig ht) — Basic ty re loa s ( BTL) for a ma imum spe d
Ta le 1 — Ag ricultural implement ty res ( diag onal construction —
low section height) — Basic tyre loa s ( BTL) for a ma imum spe d
Ta le A.1 — Ag ricultural ste ring whe ls — Tractor ty res ( d iag onal
construction — low section heig ht) — Basic ty re load s ( BTL) for a
ma imum spe d of3 km/ h and reference inflation pres ures ( IP) 9
Ta le A.2 — Ag ricultural implement ty res ( diag onal construction —
normal section heig ht) — Basic ty re loa s ( BTL) for a ma imum spe d
Ta le A.3 — Ag ricultural implement ty res ( d iag onal construction —
lowsectionheig ht) — Basic ty re loa s ( BTL) for a ma imum
spe d of 3 km/h and reference inflation pres ures ( IP) 9
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Foreword
ISO ( the International Org anization for Stand rd ization) is a worldwide
federation of national stand ards bodies ( ISO member bodies) The work of
prep ring International Stand rds is normaly car ied out throug h ISO tech ical
commit e s Each member bod y interested in a subject for which a tech ical
commit e has be n esta l shed has the rig ht to be represented on that commit e
International org anizations, g ov ernmental and non-g ov ernmental, in laison with
ISO, also take p rt in the work ISO col a orates closely with the International
Electrotech ical Commis ion ( IEC) on al mat er of electrotechnical
stand rd ization
Draft International Stand ard s a opted b the tech ical commit e s are cir ulated
to the member bodies 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 rd ISO4251-2 was prep red b Technical Commit e
ISO/TC31, Tyr es, r ims a nd va lve , S bcommit e SC5, A gr iculur a l tyr es a nd
r ims
This fifth edition cancels an replaces the fourth edition ( ISO4251-2:19 2), of
which it constitutes a technical rev ision
ISO4251 consists of the folowing p rts, under the g eneral title Tyr es (ply r a ting
ma r ked s r ie ) a nd r ims fr a gr iculur a l tr a ctor s a nd ma chine :
— Pa r t 1: Tyr e d esigna tion a nd d imensions, a nd a ppr oved r im contour s;
— Pa r t 2: Tyr e loa d r a tings;
— Pa r t 3: R ims;
— Pa r t 4: Tyr e cla ssifica tion a nd nomencla tur e;
— Pa r t 5: Log skid d er tyr es
Annex A an Annex B of this p rt of ISO4251 are for information only
Desc iptors: Ag ricultural machinery, ag ricultural tractor , tyres, pneumatc tyres,lo ds ( fores), lo d
ca aciy,ratng s
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1
1 Scope
This p rt of SO4251 specifies load rating s for the
ply rating marked series of ty res for ag ricultural
tractor an machines
Ty re desig nation an d imensions,an a prov ed rim
contour , rim dimensions, an ty re clas ification
and nomenclature are g iv en in ISO4251-1,
ISO4251-3 an ISO4251-4 respectiv ely
Serv ice des ription ( loa ind ex and spe d sy mbol
marking for existing series ( ply rating marked
series) of ag ricultural tractor driv e-whe l ty res of
rad ial construction are g iv en in ISO8 6
2 Normative r f r nce
The fol owing stand rd contains prov isions which,
throug h reference in this text, constitute prov isions
of this p rt of ISO4251 At the time of publcation,
the ed ition indicated was v ald All stand rd s 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 ty of a ply ing the most
recent edition of the stand ard indicated below
Member of IEC and ISO maintain reg ister of
cur ently v al d International Stand rd s
ISO42 3-1:19 9, D efini ions o some ter ms us d in
the tyr e ind ustr y — Pa r t1: Pneuma tic tyr es
3 Definitions
For the purposes of this p rt of ISO4251, the
definitions g iv en in ISO42 3-1 an the folowing
definitions a ply
3.1
loa /inflation pres ure relationship
loa s as g iv en in the ta les which are ma imum
v alues and are v al d for the reference inflation
pres ures indicated
3.2
cycl c lo ding ap l cation
g rad ual inc ease of p y loa to ma imum al owa le
load with u loa ing before of-field transport
4 Tyr s loads
4.1 Ag ricultural drive whe ls — Tractor tyres
Basic ty re loa s for a ma imum spe d of3 km/h,
and cor espond ing reference inflation pres ures are
g iv en in
a) Ta le 1 for ty res of diag onal construction with
normal section heig ht;
b) Ta le 2 for ty res of diag onal construction with
low section heig ht
On combine harv ester in cy cl c loa ing a pl cation,
except hi sid e combines, a loa of up to17 % of the
b sic ty re load s g iv en in Ta le 1 and Ta le 2 is
permit ed for spe ds up to10km/h with an inflation
pres ure inc ease of a proximately3 % ( consult
ty re man facturer ) This load inc ease shal
include al pos ible field and user mod ifications that
inc ease the v ehicle mas The whe l and rim
man facturer shal be consulted concerning the
streng th of the whe ls
Ty re load s at diferent spe ds ( load / spe d
relationship) are g iv en in Ta le 3 for ty res of
d iag onal construction with normal section heig ht
and ty res of d iag onal construction with low section
heig ht
Loa for ty res in dual a plcation for a ma imum
spe d of3 km/h, an cor espond ing reference
inflation pres ures are g iv en in
a) Ta le 4 for ty res of diag onal construction with
normal section heig ht;
b) Ta le 5 for ty res of diag onal construction with
low section heig ht
Load s for ty res of diag onal and rad ial construction
for special cultiv ation work an cor espond ing
reference inflation pres ures are g iv en in
a) Ta le 6 for a ma imum spe d of3 km/h;
b) Ta le 7 for cultiv ation work at a ma imum
spe d of10km/ h
4.2 Ag ricultural ste ring whe ls — Tractor
tyres
Basic ty re loa s for a ma imum spe d of3 km/ h,
and cor espond ing reference inflation pres ures are
g iv en in
a) Ta le 8 for ty res of diag onal construction with
normal section heig ht;
b) Ta le 9 for ty res of diag onal construction with
low section heig ht
Ty re load s at diferent spe ds ( load / spe d
relationship) are g iv en in Ta le 10 for ty res of
d iag onal construction with normal an low sections
4.3 Ag ricultural implement tyres
Basic ty re loa s for a ma imum spe d of3 km/ h,
ty re load s for other spe d s and special a pl cations
and cor espond ing reference inflation pres ures are
g iv en in
a) Ta le 1 for ty res of d iag onal construction with
normal section heig ht;
b) Ta le 1 for ty res of d iag onal construction with
low section heig ht
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Ta le 1 — Ag ricultural drive whe ls — Tractor tyres (diag onal construction —
normal se tion heig ht) — Basic tyre lo ds (BTL) for a maximum spe d
of3 km /h and referenc inflation pres ures (IP)
B L
kg
IP
kPa
B L
kg
IP
kPa
B L
kg
IP
kPa
B L
kg
IP
kPa
B L
kg
IP
kPa
B L
kg
IP
kPa
9.5–24
9.5–32
9.5–3
7 0
8 0
8 0 14
9 0
1 0 5
1 13
2 0
11 0
126
13 5
28
13
1 0 5
18
12 5
24
13 0 3 0
1 4–24
1 4–28
1 4–32
1 4–3
1 4–3
9 5
1 0 5
1 0 0
1 13
1 16
1 0
1 20
1 27
1 3 5
1 4 0
1 4 0
17
1415
1510
16 5
17 0
17 0
13.6–24
13.6–28
13.6–3
13.6–3
1 0 0
1 10
1 24
1 27
10
1 3 0
1 4 0
1 615
1 6 0
16
15 5
16 5
18 5
1910
20
17 0
1910
215
22 5
25
14.9–24
14.9–26
14.9–28
14.9–3
14.9–3
1 510
1 5 0
1 610
1 6 5
1 8 0
14
17 0
1820
18 0
19 0
218
18
19 0
20 5
21 0
219
24 0
23
16.9–24
16.9–26
16.9–28
16.9–3
16.9–3
16.9–3
1 725
1 7 0
1 8 0
1 9 0
2 015
2 13
13
20 0
210
217
224
23 0
2520
17
223
23 5
23 0
24 5
26 5
27 0
20
2 7 0 24
18.4–26
18.4–3
18.4–3
18.4–3
18.4–42
1 9 0
2 1 0
2 25
2 3 0
1 0
226
2415
25 5
2715
28 5
14
26 5
2815
29 0
316
33 0
8
2 9 5
318
33 5
35 5
37 5
20.8–3
20.8–3
20.8–42
2920
30 0 13
328
34 5
36 0
16
37 5
40 0
42 5
20
23.1–26
23.1–3
23.1–3
28 0
3025
32 5
1 0
324
34 0
36 5
14
3610
38 0
40 0
17
39 0 20
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3
Ta le 2 — Ag ricultural drive whe ls — Tractor tyres (diag onal
construction — low se tion heig ht) — Basic tyre lo ds (BTL) for a
m aximumspe dof3 km /h and referenc inflation pres ures (IP)
Ta le 3 — Ag ricultural drive whe ls —
Tractor tyres — Tyre lo ds at diferent
spe ds ( o d/spe d relationship)
B L
kg
IP
kPa
B L
kg
IP
kPa
B L
kg
IP
kPa
Ma im um spe d
a
km/ h
Ma im um tyr lo d
b
10 c
20
25
3
14
1 0
10
10
a
The v lues g iv n for the ma imum tyre lo ds also a ply when d riv
whe l tractor tyres are fi ed on the font a les ( ste ring whe ls)
b
Ex res ed as a p rentag e of the b sic tyre lo ds g iv n in Ta le 1 an
Ta le 2 If natonal leg islaton p rmis sp eds in e ces of3 km/ h, for
e ample up to 0km/h, a tyre lo d of9 % of the b sic tyre lo d shal b
p rmi ed at a sp ed of3 km/h, an a tyre lo d of8 % of the b sic tyre
lo d shal b p rmi ed at a sp ed of4 km/ h Tyres inten ed for hig her
sp eds,for e ample multpurp se a plicatons (MP ), wil form the
subject of a future Internatonal Stan ard
c
This a plies to driv whe l tractor tyres fi ed on font a les of font-en
lo der used in intermi ent service.Tyre inflaton pres ures ha e to b
ince sed b 3 kPa for o eratng at these o erlo ds
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Ta le 4 — Ag ricultural drive whe ls — Tractor tyres used as duals (diag onal
construction — norm al se tion heig ht) — Lo d per tyre (L) for a maxim um
spe d of3 km /h and referenc inflation pres ures (IP)
L
kg
IP
kPa
L
kg
IP
kPa
L
kg
IP
kPa
L
kg
IP
kPa
L
kg
IP
kPa
L
kg
IP
kPa
9.5–24
9.5–32
9.5–3
6 0
7 0
7 5 14
825
9 5
9 5
2 0
9 5
11 0
117
28
1 2–24
1 2–28
7 5
7 0 13
920
9 0 18
10 0
115
24
12 5 3 0
1 4–24
1 4–28
1 4–32
1 4–3
1 4–3
8 0
8 5
9 0
1 0 0
1 025
1 0
1 0 5
1 1 0
1 19
1 26
1 3 0
17
124
13 0
1410
14 5
15 0
13.6–24
13.6–28
13.6–3
13.6–3
9 5
9 0
1 0 0
1 1 0
10
1 18
1 26
1 420
1 4 0
16
13 0
14 0
16 0
16 0
20
15 5
16 0
18 0
19 0
25
14.9–24
14.9–26
14.9–28
14.9–3
14.9–3
1 3 0
1 3 5
1 415
1 4 5
1 6 5
14
15 0
16 0
16 0
17 5
1920
18
17 0
1810
18 5
1925
216
23
16.9–24
16.9–26
16.9–28
16.9–3
16.9–3
16.9–3
1 520
1 5 5
1 620
1 6 0
1 7 5
1 8 5
13
17 5
18 0
1915
19 5
20 5
22 0
17
19 0
20 0
20 5
216
229
24 0
20
2 4 0 24
18.4–26
18.4–3
1 7 0
1 8 5
19 5
21 5
24 0
24 5
2 625
2 8 0
18.4–3
18.4–42
2520
27 5
29 0
314
3315
20.8–3
20.8–3
20.8–42
25 0
2720 13
28 0
30 0
323
16
33 0
3520
3720
20
23.1–3
23.1–3
26 0
28 0
323
36 0
17
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5
Ta le 5 — Ag ricultural drive whe ls — Tractor tyres used as duals (diag onal
construction — low se tion heig ht) — Loa per tyre (L) for a m aximum
spe d of3 km/h and referenc inflation pres ures (IP)
Ta le 6 — Ag ricultural drive whe ls — Tractor tyres for spe ial cultiv tion work
(diag onal and ra ial construction) — Basic tyre lo ds (BTL) for a maxim um
spe d of3 km/h and referenc inflation pres ures (IP)
Ta le 7 — Ag ricultural drive whe ls — Tractor tyres for spe ial cultiv tion work
(diag onal and ra ial construction) — Tyre lo ds (L) for spe ial cultiv tion work
at a maxim um spe d of10km /h and referenc inflation pres ures (IP)
L
kg
IP
kPa
L
kg
IP
kPa
L
kg
IP
kPa
kg
IP
kPa
B L
kg
IP
kPa
7.2 –3
7.2 –4
8 5
9 5
28
1 0 5
1 0 0
3 0
8.3–3
8.3–42
8.3–4
8.3R3
8.3R42
8.3R4
9 0
1 0 5
1 0 0
24
1 16
1 25
1 29
320
9.5–3
9.5–4
9.5–4
9.5R3
9.5R4
9.5R4
1 13
1 25
1 320
2 0
1 3 5
1 4 5
1 5 0
28
kg
IP
kPa
L
kg
IP
kPa
7.2 –3
7.2 –4
1 1 5
1 18
29
1 325
1 4 0
3 0
8.3–3
8.3–42
8.3–4
8.3R3
8.3R42
8.3R4
1 29
1 4 0
1 4 0
26
1 5 5
1 6 5
1 710
3 0
9.5–3
9.5–4
9.5–4
9.5R3
9.5R4
9.5R4
1 4 5
1 6 5
1 7 0
23
1 7 0
1 9 5
2 0 5
3 0
N T Sp cial cultv ton work e clu es ro d a plicaton e ce t field to farm transi at sp eds not e ce ding 5km/h