9” Wheels
#40433 from John Weisberg · Rule change · TB 26-07 (2026-07 Fastrack)
In GCR, Section 9.1.4.1.F.1., change as follows:
"Wheels may not exceed 18 inches in diameter. Cars equal to or less than 2,850 2,825 lbs. minimum allowed race weight may not
use wheels wider than 8 inches. Cars greater than 2,850 2,825 lbs. minimum allowed race weight may not use wheels wider than
9 inches."