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.
(E) Rim Diameter: Diameter of the wheel in inches.
(F) 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.
See also:
Fog Lamps
To replace a front fog lamp bulb:
1. Pull out the push-pins located on
the underside of the protection
shield to remove the shield.
2. Reach up behind the front
bumper area from under the
...
Safety Chains
Always attach chains between the vehicle and the trailer. Cross the safety chains
under the tongue of the trailer to help prevent the tongue from contacting the road
if it becomes separated from t ...
Traction – AA, A, B, C
The traction grades, from highest to lowest, are AA, A, B, and C. Those grades
represent the tire's ability to stop on wet pavement as measured under controlled
conditions on specified governm ...