Tire re p la c e m e n t
137n
To m a inta in g ood h a nd ling a nd ve hic le Tra c tio n
Te m p e ra tu re
re s p ons e , u s e o nly tire s o f a s ingle
The tra c tio n g ra d e s , fro m h ighe s t to
lowe s t, a re AA, A, B , a nd C .
Thos e g ra d e s re p re s e nt th e tire 's a b ility tire 's re s is ta nc e to th e g e ne ra tio n o f
to s to p o n w e t p a ve m e nt a s m e a s ure d
und e r c ontro lle d c ond itio ns o n s p e c i-
fie d g ove rn m e nt te s t s urfa c e s o f a s -
p ha lt a nd c onc re te . A tire m a rke d C
m a y h a ve p oor tra c tio n p e rfo rm a nc e .
The te m p e ra tu re g ra d e s a re A (th e
highe s t), B a nd C , re p re s e ntin g th e
tre a d c onfigura tio n fro m a s ingle m a nu-
fa c tu re r. B MW te s ts a nd a p p ro ve s
whe e l/tire c om b ina tio ns . R e fe r to
p a ge 1 42.
he a t a nd its a b ility to d is s ip a te h e a t
whe n te s te d u nd e r c ontro lle d c ond i-
tio ns o n a s p e c ifie d in d oor la b ora to ry
te s t w he e l.
S us ta ine d h igh te m p e ra tu re c a n c a us e
th e m a te ria l o f th e tire to d e ge ne ra te
a nd re d uc e tire life , a nd e xc e s s ive te m -
p e ra tu re c a n le a d to s ud d e n tire fa ilure .
The g ra d e C c orre s p ond s to a le ve l o f
DO T Qu a lity Gra d e s
Tre a d we a r
Tra c tio n AA A B C
Te m p e ra tu re A B C
The tra c tio n g ra d e a s s igne d to
th is tire is b a s e d o n s tra ight-
a he a d b ra kin g tra c tio n te s ts , a nd d oe s
All p a s s e nge r c a r tire s m us t c on-
form to Fe d e ra l S a fe ty R e q uire -
not in c lud e a c c e le ra tio n, c orn e ring, h y- p e rfo rm a nc e w hic h a ll p a s s e nge r c a r
m e nts in a d d itio n to th e s e g ra d e s .<
d ro p la ning, o r p e a k tra c tio n c ha ra c te r-
is tic s .<
tire s m us t m e e t u nd e r th e Fe d e ra l Mo -
to r Ve hic le S a fe ty S ta nd a rd No . 1 09.
Gra d e s B a nd A re p re s e nt h ighe r le ve ls
of p e rfo rm a nc e o n th e la b ora to ry te s t
whe e l th a n th e m inim um re q uire d b y
la w.
Tre a d w e a r
The tre a d we a r g ra d e is a c om p a ra tive
ra tin g b a s e d o n th e w e a r ra te o f th e tire
whe n te s te d u nd e r c ontro lle d c ond i-
tio ns o n a s p e c ifie d g ove rn m e nt te s t
c ours e .
Fo r e xa m p le , a tire g ra d e d 1 50 w ould
we a r o ne a nd o ne -ha lf (1 1 /2) tim e s a s
we ll on th e g ove rn m e nt c ours e a s a tire
gra d e d 1 00. Th e re la tive p e rfo rm a nc e
of tire s d e p e nd s u p on th e a c tu a l c ond i-
tio ns o f th e ir u s e , h owe ve r, a nd m a y
d e p a rt s ignific a ntly fro m th e n orm d ue
to va ria tio ns in d rivin g h a b its , s e rvic e
p ra c tic e s a nd d iffe re nc e s in ro a d c ha r-
a c te ris tic s a nd c lim a te .
The te m p e ra tu re g ra d e for th is tire
is e s ta b lis he d fo r a tire th a t is
p ro p e rly in fla te d a nd n ot o ve rlo a d e d .
Exc e s s ive s p e e d , u nd e rinfla tio n, o r e x-
c e s s ive lo a d ing, e ith e r s e p a ra te ly o r in
c om b ina tio n, c a n c a us e h e a t b uild up
a nd p os s ib le tire fa ilure .<
Online Edition for Part No. 01 41 0 004 597 - © 08/99 BMW Group
| Categories | BMW 7-Series Manuals, BMW Manuals |
|---|---|
| Tags | BMW 740i, BMW 740iL, BMW 750iL, BMW E38 |
| Model Year | 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(0 votes, average: 0 out of 5)