Our newest Super Alloy rotor in 11.75 diameter is targeted directly to Dirt Late Model and Modified racing. Wilwood's proprietary Super Alloy material provides the lowest rotating and un - sprung weight, without degradation, shrinkage and warping like comparable Iron Steel lightweight rotors. Super Alloy rotors provide a durable lightweight option in applications where sustained temperatures remain in the low to moderate range, and high heat spikes are only observed on an intermittent basis. Our special alloy and proprietary manufacturing processes give these rotors high resistance to thermal distortion with excellent friction and wear characteristics against the pads.