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347
Operation
Tires and wheels
Tire code
The tire code 3 (
୴ page 346) indicates
the tire construction type. The “R” stands
for radial tire type. Letter “D” means diag-
onal or bias ply construction; letter “B”
means belted-bias ply construction.
At the tire manufacturer’s option, any tire
with a speed capability above 149 mph
(240 km/h) can include a “ZR” in the size
designation (for example: 245/40 ZR 18).
For additional information, see “Tire speed
rating” (
୴ page 348).
Rim diameter
The rim diameter 4 (
୴ page 346) is the
diameter of the bead seat, not the
diameter of the rim edge. Rim diameter is
indicated in inches (in).
Tire load rating
The tire load rating 5 (
୴ page 346) is a
numerical code associated with the
maximum load a tire can support.
For example, a load rating of 91 corre-
sponds to a maximum load of 1356 lbs
(615 kg) the tire is designed to support.
See also “Maximum tire load”
(
୴ page 351) where the maximum load as-
sociated with the load index is indicated in
kilograms and lbs.
For additional information on tire load
rating, see “Load identification”
(
୴ page 349).
Warning! G
The tire load rating must always be at least
half of the GAWR (
୴ page 355) of your vehi-
cle. Otherwise, tire failure may be the result
which may cause an accident and/or seri-
ous personal injury to you or others.
Always replace rims and tires with the same
designation, manufacturer and type as
shown on the original part.
Warning! G
Do not overload the tires by exceeding the
specified load limit or vehicle capacity
weight as indicated on the placard located
on the driver’s door B-pillar. Overloading the
tires can overheat them, possibly causing a
blowout. Overloading the tires can also
result in handling or steering problems, or
brake failure.
i
Tire load rating 5 (୴ page 346) and
Tire speed rating 6 (
୴ page 346) are
also referred to as “service descrip-
tion”.