Life expectancy on tires all depends on how you use them and how much you want to spend. I knew IT drivers in the Northeast who would buy a new set of tires every weekend. The same goes for slicks, but you can make both last longer if you don't mind loosing some performance. I will do the same thing with slicks that I did with my DOT tires. 2 new tires on the front(FWD VW) and use them for two race weekends and then move them to the back and put 2 new ones on the front.

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Sam Rolfe
TBR Motorsports
#85 ITC VW Rabbit being converted to LPHP
#85 GP Scirocco