Speed rating
The speed rating is part of the tire identification. It specifies the speed range for which the tire is approved.
See also:
Temperature
WARNING
The temperature grade for this tire is
established for a tire that is properly inflated
and not overloaded. Excessive speed,
underinflation, or excessive loading, either
separately ...
Uniform Tire Quality Grading Standards
A uniform standard to grade the quality of
tires with regards to tread quality, tire traction
and temperature characteristics. Ratings are
determined by tire manufacturers using U.S. government ...
Rim
This is the part of the wheel on which the tire
is mounted. ...