Tire Designations; Tire Terminology And Definitions - GMC Yukon 2023 Owner's Manual

(7) Maximum Cold Inflation Load
Limit Maximum load that can be
:
carried and the maximum pressure
needed to support that load. For
information on recommended tire
pressure see Tire Pressure 0 346 and
Vehicle Load Limits 0 194.
(8) Temporary Use Only Only use a
:
temporary spare tire until the road tire
is repaired and replaced. This spare tire
should not be driven on over 112 km/h
(70 mph), or 88 km/h (55 mph) when
pulling a trailer, with the proper
inflation pressure. See Full-Size Spare
Tire 0 370.

Tire Designations

Tire Size
The example shows a typical passenger
vehicle tire size.
Passenger (P-Metric) Tire
(1) Passenger (P-Metric) Tire
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.
(2) Tire Width The 3-digit number
:
indicates the tire section width in
millimeters from sidewall to sidewall.
(3) Aspect Ratio A 2-digit number that
:
indicates the tire height-to-width
measurements. For example, if the tire
size aspect ratio is 75, as shown in
item (3) of the illustration, it would
mean that the tire's sidewall is
75 percent as high as it is wide.
(4) Construction Code
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.
(5) Rim Diameter
The wheel in inches.
:
(6) Service Description
characters represent the load index and
speed rating of the tire. The load index
represents the load carrying capacity a
tire is certified to carry. The speed
rating is the maximum speed a tire is
certified to carry a load.

Tire Terminology and Definitions

Air Pressure
the tire pressing outward on each
square inch of the tire. Air pressure is
expressed in kPa (kilopascal) or psi
(pounds per square inch).
Aspect Ratio
tire's height to its width.
Vehicle Care 343
A letter code is
:
Diameter of the
:
These
:
The amount of air inside
:
The relationship of a
: