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Guess the autocross is taking a toll on my tires because I have noticed the tread wear indicators in the center of the rear tires only are showing. Three of the tread wear indicators indicate a need for replacement. Went to tirerack.com and was surprised, they mentioned, just like my manual, we should be getting 36K out of these tires too! Why would they wear only in the center? I raise the air pressure during autocross events but lower it back when done racing. This prevents the sidewalls from collapsing on the course with all those hairpin turns at high speed. Here are the stats on our tires from tirerack:
http://www.tirerack.com/tires/tires...A&partnum=94HR0RSA&vehicleSearch=true&index=0
http://www.tirerack.com/tires/tires...A&partnum=94HR0RSA&vehicleSearch=true&index=0