2010 Jeep Liberty Owner's Manual - Page 504

IF YOU NEED CONSUMER ASSISTANCE 503 in each category is shown on the sidewall of the tires on Traction Grades The Traction grades, from highest to lowest, are AA, A, B, your vehicle. and C. These grades represent the tire's ability to stop on All passenger car tires must conform to Federal safety wet pavement, as measured under controlled conditions requirements in addition to these grades. on specified government test surfaces of asphalt and Treadwear concrete. A tire marked C may have poor traction perforThe Treadwear grade is a comparative rating, based on mance. the wear rate of the tire when tested under controlled WARNING! conditions on a specified government test course. For example, a tire graded 150 would wear one and one-half The traction grade assigned to this tire is based on times as well on the government course as a tire graded straight-ahead braking traction tests, and does not 100. The relative performance of tires depends upon the include acceleration, cornering, hydroplaning, or actual conditions of their use, however, and may depart peak traction characteristics. significantly from the norm due to variations in driving habits, service practices, and differences in road characteristics and climate. 9