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The Wilwood Forged Superlite 4R‑ST in Quick‑Silver Nickel finish combines differential bore pistons with Thermlock® pistons in ST models to reduce heat transfer and pad taper wear. Thermlock technology cuts caliper, fluid, and seal temperatures by up to 25% over standard pistons, making these calipers well suited to sustained hard braking on dirt and asphalt ovals, as well as off‑road, rally, and road‑course use.
Wilwood Caliper-Forged Superlite 4R-ST-R/H - Nickel 1.25/1.25in Pistons 0.81in Disc
