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The difference in diameter is pretty alarming, isn’t it? For the record, factory rear brake rotors on SN-95/New Edge Mustang GTs measure only 10.50 inches. The Cobra rotor (right) has a little more diameter, measuring 11.65 inches from side to side. Moving up to Venom Technologies’ 14-inch rear disc is a big jump—especially if you’re starting with factory equipment.