The Sidewall of your tire is labelled with several specifications that are important for you to understand.
Here is a brief explaination on some of the most common specification.
A. SECTION WIDTH:
Section width is the width of an inflated tire in millimeters at its widest point.
B. ASPECT RATIO:
Section width and hight are used to determine the Aspect Ratio. The lower the ratio, the shorter the sidewall.
The "R" stands for "radial"construction.
D. RIM SIZE:
The diameter of the wheel (not the tire) in inches.
E. LOAD INDEX:
The load index number corresponds to the maximum load-carrying capacity of the tire. Refer to load index values in the chart below.
F. SPEED RATING
The speed symbol corresponds to the tire's maximum speed capability (under optimal conditions).
|Speed Rated||Speed Category:|
UTQG Ratings consists of the following 3 components: Treadwear, Traction and Temperature.
Traction grades range from AA, A, B and C (AA being the highest grade). These letters represent a tire's ability to stop on wet pavement as measure on a specified government test course. Any tire rated below C is considered unacceptable for road use.
The temperature grades range from A, B and C (A being the highest and C the lowest). These letters denote a tire's ability to dissipate heat under a controlled indoor test environment. A tire rated below C is considered not approved for road use.
This is the wear rate of the tire, comparable only to other tires within a tire manufacturer's line. 100 is the baseline. A tire with a rating of 200 will last twice as long on the government's course as compared to a tire rating 100.