T1 Tire Equality
#40342 from David Swernoff · Rule change · TB 26-07 (2026-07 Fastrack)
In GCR, Section 9.3.47.Tires, change as follows:
"Tires shall be 124 (“U”) mph rated or better unless otherwise specified or controlled. In the Improved Touring, Super Touring,
American Sedan, Spec Miata, B-Spec, C-Spec and Touring 2-4 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.”"