Treadwear
The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course.
For example, a tire graded 150 would wear one and one-half (1- 1/2) times as well on the government course as a tire graded 100.
The relative performance of tires depends upon the actual conditions of their use, however, and may depart significantly from the norm due to variations in driving habits, service practices and differences in road characteristics and climate.
See also:
Changing the coolant
WARNING
Never attempt to remove the radiator cap until the engine has been shut off and
has cooled down completely. Since the coolant is under pressure, you may suffer
serious burns from a spray ...
Uniform tire quality grading standards
This information indicates the relative performance of passenger car tires in
the area of treadwear, traction, and temperature resistance. This is to aid the
consumer in making an informed choice ...
For U.S.A.
The following information has been
compiled according to Code of
Federal Regulations “Title 49, Part
575”. ...