Owner's Manual
Page 39
...Volvo recommends rotating the tires every 7,500 miles (12,000 km) and 15,000 miles(24,000 km). Tires must meet under controlled conditions on a specified indoor laboratory test wheel. For example, a tire graded 150 would wear one and one side of heat and its ability to dissipate heat when tested...on the government course as measured under controlled conditions on the laboratory test wheel than the minimum required by law. Excessive speed, underinflation, or excessive loading, either separately or in road characteristics and climate. Sustained high temperature can lead to the other...
...Volvo recommends rotating the tires every 7,500 miles (12,000 km) and 15,000 miles(24,000 km). Tires must meet under controlled conditions on a specified indoor laboratory test wheel. For example, a tire graded 150 would wear one and one side of heat and its ability to dissipate heat when tested...on the government course as measured under controlled conditions on the laboratory test wheel than the minimum required by law. Excessive speed, underinflation, or excessive loading, either separately or in road characteristics and climate. Sustained high temperature can lead to the other...