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tire load rating and speedrating required for
your vehicle.
:
Tire width
;
Nominalaspectratio in %
=
Tire code
?
Rimdiameter
A
Loadbearing index
B
Speed rating
General: depending on the manufacturer's
standards,the size imprinted in the tire wall may
not contain any letters or maycontain one letter
thatprecedes the size description.
If there is no letter preceding the size descrip-
tion(as shown above): these arepassenger
vehicletiresaccording to Europeanmanufac-
turing standards.
If "P"precedes the size description: these are
passengervehicletiresaccording to U.S. man-
ufacturingstandards.
If "LT" precedes the size description: these are
light truck tiresaccording to U.S. manufacturing
standards.
If "T"precedes the size description: compact
emergency wheels with high tire pressure that
areonlydesignedfor temporary useinanemer-
gency.
Tire width:tire width : shows the nominal tire
width in millimeters.
Aspectratio: aspect ratio ; is the size ratio
between the tire height and tire width and is
shown in percent. The aspect ratio is calculated
by dividing the tire width by the tire height.
Tire code:tire code = specifiesthe tire type.
"R"represents radial tires; "D" represents diag-
onalt
ires
; "B" represents diagonalra
dial tires.
Optionally,tireswithamaximum speedofover
149 mph (240 km/h)may have "ZR" in the size
description, depending on the manufacturer
(e.g. 245/40ZR18).
Rim diameter: rim diameter ? is the diameter
of the bead seat, not the diameterofthe rim
flange.The rimdiameterisspecifiedin
inches (in).
Load-bearingindex: load-bearing index A is a
numerical codethatspecifiesthe maximum
load-bearing capacity of atire.
Do not overload the tiresbyexceeding the
specifiedloadlimit.The maximumpermissible
load can be found on the vehicle's Tire and
Loading Informationplacard on the B-pillar on
the driver's side (
Y page 303).
Example:
Load-bearingindex 91 indicates amaximum
load of 1,356 lb (615kg) thatthe tirescan bear.
For furtherinformation on the maximum tire
load in kilograms and lbs, see(
Y page 309).
For furtherinformation on the load bearing
index, see"Load index" (
Y page 309).
Speed rating:speedrating B specifiesthe
approved maximum speedofthe tire.
i
Tire data is vehicle-specific and maydeviate
fromthe data in the example.
Regardlessofthe speedrating,alwaysobserve
the
speedlimits. Drive carefullyand adaptyour
drivingstyle to the trafficconditions.
Summertires
Index Speed rating
Q up to 100 mph (160km/h)
R up to 106 mph (170km/h)
S up to 112 mph (180km/h)
T up to 118 mph (190km/h)
H up to 130 mph (210km/h)
V up to 149 mph (240km/h)
W up to 168 mph (270km/h)
Y up to 186 mph (300km/h)
ZR...Y up to 186 mph (300km/h)
ZR...(..Y) over186 mph (300 km/h)
ZR over149 mph (240 km/h)
R
Optionally,tireswithamaximum speedof
over149 mph (240km/h)may have "ZR" in
308
Allabout wheels andtires
Wheelsand tires
310


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