9.3.45 Clarification
#33612 from Club Racing Board · Rule change · TB 23-01 (2023-01 Fastrack)
In Cars and Equipment, GCR section 9.3.45, add the following:
"In the Improved Touring, Super Touring, American Sedan, Spec Miata, B-Spec and Touring categories, any U rated, or better,
DOT approved tire is required. Re-grooving of DOT tires by any method is not permitted once the tire has left the manufacturer.
Grooving or re-grooving of non-DOT tires is permitted unless otherwise stated in class-specific rules. Recapping of
tires is not permitted in any class. Tire size is unrestricted unless otherwise stated in class-specific rules. The only modifications
allowed to DOT tires are having treads "shaved" or "trued."