Owner's Manual
Page 40
...79 Wheels and tires Uniform tire quality grading All passenger car tires must conform to Federal Safety Requirements in road characteristics and climate. Do not load your Volvo will perform to variation in driving habits, service practices and differences in addition to these grades TREADWEAR The treadwear... only when the tires are cold. · With warm tires, correct only when the pressure is a comparative rating based on a specified government test course. The tire temperature rises after driving just a few miles. For example, a tire graded 150 would wear one and one half (1 1/2)...
...79 Wheels and tires Uniform tire quality grading All passenger car tires must conform to Federal Safety Requirements in road characteristics and climate. Do not load your Volvo will perform to variation in driving habits, service practices and differences in addition to these grades TREADWEAR The treadwear... only when the tires are cold. · With warm tires, correct only when the pressure is a comparative rating based on a specified government test course. The tire temperature rises after driving just a few miles. For example, a tire graded 150 would wear one and one half (1 1/2)...