width MERCEDES-BENZ M-Class 2012 W166 User Guide

Maximum
loadrating
The maximu mload rating inkilograms or
pounds isthe maximum weightforwhich a
tire isapproved. Maximu
mperm issible tirepressur e
Maximum permissible tirepressure forone
tire. Maximu
mload onone tire
Maximum loadonone tire. This iscalculated
by dividing themaximum axleload ofone axle
by two. PSI
(pounds persquar einch)
As tand arduni tofm easure fortire pressure. Aspect
ratio
Relationship betweentireheight andtire
width inpercen t. Tir
epr essure
This ispressure insidethetire applying an
outward forceto each square inchofthe tire's
surface. Thetirepressure isspecified in
pounds persquare inch(psi), inkilopascal
(kPa) orinbar. Thetirepressure shouldonly
be corr ectedwhen thetires arecold. Tir
epr essure ofcold tires
The tires arecold:
R ifthe vehicle hasbeen parked without
direct sunlight onthe tires foratleast three
hours and
R ifthe vehicle hasnotbeen driven morethan
1 mile (1.6km). Tr
ead
The part ofthe tire that comes intocon tact
with theroad. Bead
The tirebead ensures thatthetire sits
securely onthe wheel. Thereareseveral steel
wires inthe bead topreven tthe tire from
comin gloose fromthewheel rim. Sidewall
The part ofthe tire between thetread andthe
bead. Weight
ofoptional extras
The combin edweight ofthose option alext ras
that weigh morethanthereplaced standard
part andmore than2.3kilograms (5lbs).
These optionalext ras, such ashigh-
perform ancebrakes, levelcontrol, aroof rack
or ahigh-perf ormancebatter y,are not
included inthe curb weight andaccesso ry
weight. TIN
(Tire Identificat ionNum ber)
This isaunique identifierwhich canbeused
by atire manufact urertoident ifytires, for
example foraproduct recall,andthus ident ify
the purchasers. TheTINismade upofthe
manufact urer'sidentitycode, tiresize, tire
type code andthemanufact uringdate. Load
bearing index
The load bearing index(alsoloadindex) isa
code thatcontains themaximum loadbearing
capacity ofatire. Definition
ofter ms fortires and loading
373Wheels and tires Z