Wilwood Forged Superlite Internal Lug-Mount Brake Calipers w/ Thermlock Pistons provide the pad wear performance advantages of differential bore pistons (1.75&1.88) with the option for ultimate heat protection using Thermlock® pistons in the ST models. Differential piston bores compensate for leading-edge mechanical loading and temperature variances across the pad face to reduce pad taper wear in sustained high temperature applications. Thermlock® pistons in the ST models block heat transfer from the pads and reduce temperatures in the caliper, fluid, and seals by up to 25% over standard stainless steel pistons. These are the go-to calipers for all types sustained hard braking on asphalt ovals.
 
Calipers are for 1.25" Rotors.