Chevrolet Spark Owners Manual: Tire Designations
Tire Size
The following is an example of a typical passenger vehicle tire size.
(1) 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.
(2) Tire Width: The three-digit number indicates the tire section width in millimeters from sidewall to sidewall.
(3) 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 3 of the illustration, it would mean that the tire's sidewall is 60 percent as high as it is wide.
(4) 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.
(5) Rim Diameter: Diameter of the wheel in inches.
(6) Service Description: These 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 Sidewall Labeling
Useful information about a tire is molded into its sidewall. The examples show
a typical passenger tire sidewall.
Passenger (P-Metric) Tire Example
(1) Tire Size: The tire size is a combinatio ...
Tire Terminology and Definitions
Air Pressure: The amount of air inside the tire pressing outward on each square
inch of the tire. Air pressure is expressed in kPa (kilopascal) or psi (pounds per
square inch).
Accessory Weight: ...
Other materials:
All-Season Tires
This vehicle may come with all-season tires. These tires are designed to provide
good overall performance on most road surfaces and weather conditions. Original
equipment tires designed to GM's specific tire performance criteria have a TPC specification
code molded onto the sidewall. Origi ...
Cruise Control
If equipped with cruise control:
Press to turn the cruise control
system on and off. A white indicator comes on in the instrument cluster.
RES/+: If there is a set speed in memory, press briefly to resume to that speed
or press and hold to accelerate. If cruise control is already active, u ...
Steering Wheel Controls
If equipped with audio steering wheel controls, some audio controls can be adjusted
at the steering wheel.
SEEK or SEEK
(Next/ Previous): Press to go to the
next or previous radio station, song on an iPod®, or file on a USB device (if equipped).
(Push to Talk): If equipped with
Bluet ...
