Match your rotors with your 9 spoke mags! Rotors line up with your mag spokes perfectly! 11.5 – Center Bore 1.995″ 11.8 – Center Bore 2.22″(comes with rotor adapter) Front rotors are notched for a speedo drive. These rotors are made out of 420 stainless steel. Direct bolt up on a factory 9 spoke.