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I just cam across this tidbit from Volvo, I thought it very interesting:
TIRE REPLACEMENT:
When tire replacement is necessary, Volvo strongly recommends replacing all four tires at the same time with identical tires as explained above. Failure to do so can result in circumference differences that may damage the transmission and all wheel drive
system. If only one or two tires are replaced, the new tire(s) must be identical to the tires with which the car was built, and must be mounted on the FRONT AXLE ONLY! Failure to do this may damage the transmission and all wheel drive system.
TIRE ROTATION:
The front tires of the all wheel drive vehicle are the primary drive tires. The primary drive tires will wear faster than the rear wheels. The tires with the least wear and largest circumference must always be on the front. Therefore, Volvo recommends rotating the tires every 7,500 miles (12,000 km). Tires should be rotated front-to-back/back-to-front
only. Tires must maintain the same direction of rotation throughout their lifetime, and should never be rotated from one side of the vehicle to the other.
CAUTION:
Failure to rotate tires at recommended intervals will cause uneven tire wear and may damage the transmission and all wheel drive system. However, if the front tires are newer (have less wear) than the rear tires, then tires should not be rotated until the front tires wear to the same circumference as the rear tires.
Klaus
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Two good Volvos, a 220 and a V70R
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