Check the rules. The Bridgestone RE-01R is in that category of low treadwear rating tires that the industry calls "extreme performance summer tires". Even though many of us use them for daily driving, we do not consider them fair for our Showroom category. They are legal in our Tuner category. The race compound you mention is only legal in the Modified category.
And don't bother comparing our rules with the SCCA's Solo rules.
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