Quote:
Originally Posted by 450knotOffice
Considering the weight of the engine over the rear tires of all 911's, along with the very slight toe-in and positive rear camber of the rear wheels/tires when the alignment is set to spec, ALL rear tires on 911's will wear somewhat unevenly as they are used. Wear will be more pronounced on the inboard portion of the tires and some cupping will develop due to the slight toe-in of the rear tires. This is what will eventually cause tires on 911's to begin to rumble/howl/growl. I've seen it on N spec and non-N spec tires. Due to the aforementioned alignment settings of 911's (including 911, 964, 993, 996, 997 models), the rear tires of these cars will never get quieter as they wear. Fwiw, the alignment settings on my 996 are spot on set to Porsche specifications.  |
FWIW it is not only possible but entirely prudent to align a 911 so that the tires will wear evenly & therefore as the tread depth is reduced so is the source of tire generated noise. If your alignment technician can't do this find one that will.
