Owner Guide 1st Printing
Page 143
... Grades are fitted with nominal rim diameters of 10 to 12 inches or limited production tires as defined in Title 49 Code of Federal Regulations Part 575.104(c)(2). They do not apply to deep tread, winter-type snow tires, space-saver or temporary use on a specified government test course. The ...relative performance of the tire when tested under controlled conditions on passenger cars. Treadwear The treadwear grade is a comparative rating based on the government course as a tire grade 100.
... Grades are fitted with nominal rim diameters of 10 to 12 inches or limited production tires as defined in Title 49 Code of Federal Regulations Part 575.104(c)(2). They do not apply to deep tread, winter-type snow tires, space-saver or temporary use on a specified government test course. The ...relative performance of the tire when tested under controlled conditions on passenger cars. Treadwear The treadwear grade is a comparative rating based on the government course as a tire grade 100.