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Originally Posted by racer_d
Check the rulebook!
Changing tires can affect the class you run in. An "R" comp tire can put you in an improved or modified class that, depending on what you have done to your car can put you at an extreme disadvantage. Many clubs use a treadwear rating of 140 as a guideline. Above 140=street tire. Below 140=competition tire.
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I was worried about this as well but in all the events I've ran with SCCA my Victoracers didn't move me into a different class (kind of sort of but not really). In Chicago and Milwaukee SCCA the race tires make you a true AS. Before I put race tires on I would run "Street Tire" AS or "Street Tire" RWD. I'm pretty sure SCCA nationals is set up this way as well even thought I doubt anyone shows up without race tread.
This has been my experience so I'm hoping a SCCA rule expert can comment...
Of course there are autocross clubs outside of SCCA...
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