Chevrolet 2010 Avalanche, Owner'S Manual, Page: 473 / 582

Light Truck (LT ‐ Metric) Tire
(A) Light Truck (LT ‐ Metric) Tire
:
The United
States version of a metric tire sizing system. The
letters LT as the first two characters in the tire size
means a light truck 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 75, as
shown in item C of the light truck (LT
‐ Metric) tire
illustration, it would mean that the tire's sidewall is
75 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.
(E) Rim Diameter
:
Diameter of the wheel in
inches.
(F) Load Range
:
Load Range.
(G) Service Description
:
The service description
indicates the load index and speed rating of a
tire. If two numbers are given as in the example,
120/116, then this represents the load index for
single versus dual wheel usage (single/dual).
The speed rating is the maximum speed a tire is
certified to carry a load.
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