M&H Racemaster - 07-11 Mustang Shelby GT500 M&H Drag Radial 275/40/18 for Stock 18" Wheels Great replacement tire for your Shelby GT500 in need of traction! Closest fit for factory 18" x 9.5" wheels in width and diameter. Taller than stock at 750 revs per mile (vs. 771 stock revs per mile of Goodyear 285/40/18). Recommended for summer street driving and drag racing. Reduced tread life due to soft compound. Recommend 25-32psi on street (35psi for dynoing) and 15-20psi for track. Lightest drag radial on the market. 275/45R18 NEW tire from M&H! DOT Certified TUBELESS •Tread Width: 9.5" •Section Width: 10.9" •Diameter: 27.7" •Circumference: 88.0" •Rim Size: 10.0" •Comparable Race Size 10.0/28.0R18 •Code: ROD-21 *(NOTE) TIRES ARE ONLY SOLD AS PAIRS. YOU MUST PUT AT LEAST 2 IN THE QUANTITY BOX.*