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The tire size is a combination of
letters and numbers used to define a particular
tire's width, height, aspect ratio, construction type,
and service description. See the Tire Size
illustration later in this section for more detail.
Original equipment tires designed
to GM's specific tire performance criteria have a
TPC specification code molded onto the sidewall.
GM's TPC specifications meet or exceed all
federal safety guidelines.
Department of Transportation (DOT) code
indicates that the tire is in compliance with the
U.S. Department of Transportation Motor Vehicle
Safety Standards.
and numbers following DOT (Department of
Transportation) code is the Tire Identification
Number (TIN). The TIN shows the manufacturer
and plant code, tire size, and date the tire was
manufactured. The TIN is molded onto both sides
of the tire, although only one side may have the
date of manufacture.
number of plies in the sidewall and under the
tread.
The
manufacturers are required to grade tires based
on three performance factors: treadwear, traction,
and temperature resistance. For more information
see
Maximum load that can be carried and the
maximum pressure needed to support that load.
The letters
The type of cord and
Tire
.
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