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The GT-72 curved-vane 14-inch slotted rotor dwarfs the 12-inch stock-sized rotor. Even though the new kit weighs the same as the stock stuff, the Wilwood rotor, even with the aluminum hat, is about 3 pounds heavier than the stocker (16.90 vs. 19.95 pounds). This isn't a bad thing since all that extra mass helps the brake system hold up better under hard track pounding. The 1.25-inch thick rotor is cast from premium-grade, long-grain carbon iron, which results in excellent thermal stability and resistance to distortion.