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number of plies in the sidewall and under the
tread.
The letters and numbers following the 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.
Maximum load that can be carried and the
maximum pressure needed to support that load.
The temporary use tire or
compact spare tire should be inflated to 60 psi
(420 kPa). For more information on tire pressure
and inflation see
.
A combination of letters and
numbers define a tire's width, height, aspect ratio,
construction type, and service description.
The letter T as the first character in the tire size
means the tire is for temporary use only.
6-56
The type of cord and
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.
The following illustration shows an example of a
typical passenger vehicle tire size.
States version of a metric tire sizing system.
The letter P as the first character in the tire size
means a passenger vehicle tire engineered to
standards set by the U.S. Tire and Rim
Association.
The United
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