Tire designations, Tire designations -41 – GMC 2011 Acadia User Manual

Page 369

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GMC Acadia/Acadia Denali Owner Manual - 2011

Vehicle Care

10-41

(F) Tire Size

:

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.

(G) TPC Spec (Tire
Performance Criteria
Specification)

:

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.

Tire Designations

Tire Size

The following is an example
of a typical passenger vehicle
tire size.

(A) Passenger (P‐Metric) Tire

:

The United 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.

(B) Tire Width

:

The three‐digit

number indicates the tire section
width in millimeters from
sidewall to sidewall.

(C) Aspect Ratio

:

A two‐digit

number that indicates the tire
height‐to‐width measurements.
For example, if the tire size
aspect ratio is 60, as shown in
item C of the illustration, it would
mean that the tire's sidewall is
60 percent as high as it is wide.

(D) Construction Code

:

A letter code is used to indicate
the type of ply construction in
the tire. The letter R means
radial ply construction; the
letter D means diagonal or
bias ply construction; and the
letter B means belted‐bias ply
construction.

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