Chevrolet Captiva Owners Manual: Tire Designations
Tire Size
The following is an example of a
typical passenger vehicle
tire size.

- 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.
- Tire Width: The three-digit
number indicates the tire section
width in millimeters from
sidewall to sidewall.
- 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.
- 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.
- Rim Diameter: Diameter of
the wheel in inches.
- 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.
Useful information about a tire is
molded into its sidewall. The
examples show a typical
passenger vehicle tire and a
compact spare tire sidewall.
Passenger (P-Metric) Tire Example
...
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 Weigh ...
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Chevrolet Captiva Owners Manual > OnStar: OnStar Services
Emergency
With Automatic Crash Response,
the built-in system can automatically
connect to help in most crashes,
even if help cannot be requested.
Press > to connect to an
Emergency Advisor. GPS
technology is used to identify the
vehicle location and can provide
critical information t ...