1.100" X 12.90" O.D. LEFT SIDE GT-48 ROTOR12 X 8.75" BOLT CIRCLEWEIGHS 12.3 LBS.GT 48 CURVED VANE ROTORS ARE BUILT FOR THE EXTREME CONDITIONS OF PROFESSIONAL MOTORSPORTSTHE SUPERIOR HEAT ABSORPTION AND DISSIPATION CHARACTERISTICS OF THESE HEAVY WALL DIRECTIONAL VANE ROTORS ARE THE KEYS TO PREVENTING HEAT FADE AND REALIZING LONG SERVICE LIFE FROM THE ROTORS AND PADSALL ROTORS ARE CAST FROM PREMIUM GRADE, LONG GRAIN CARBON IRON FOR LONG WEAR, THERMAL STABILITY, AND RESISTANCE TO DISTORTIONEVERY GT ROTOR IS FULLY DETAIL MACHINED TO ELIMINATE STRESS POINTS AND UNNECESSARY WEIGHT AWAY FROM THE PAD SWEEP FACE. THE FACES AND O.D. ARE PRECISION TURNED TO LESS THAN .001" FOR FLATNESS, PARALLELISM, AND RUN-OUTAN ASYMMETRICAL FACE SLOT PATTERN PROVIDES SMOOTHER ENGAGEMENT THROUGH REDUCED HARMONICS AND IMPROVED THERMAL BALANCE BETWEEN THE I.D. AND O.D. OF THE ROTOREVERY ROTOR IS THEN INDIVIDUALLY DYNAMIC BALANCED TO PROVIDE VIBRATION FREE PERFORMANCE AT ANY SPEEDTHESE ROTORS PROVIDE THE HIGHEST COOLING CAPACITY AND LONGEST SERVICE LIFE FOR EXTREME BRAKING SHORT TRACKS AND ROAD COURSE COMPETITION