Wilwood 170-17941 Big Brake Dynamic Lug Drive Disc Brake Rotor Hat

The Wilwood 170-17941 is a Big Brake Dynamic Lug Drive rotor hat featuring Wilwood's advanced bolt-free rotor mounting system. Unlike conventional hats that use rotor bolts, this lug-drive design allows the rotor to move independently of the hat as it expands and contracts through heat cycles — eliminating all thermally generated stress at the rotor attachment points.

The result is a rotor that stays flatter and runs truer under extreme braking conditions, delivering consistent brake response and pedal feel while eliminating pad knock-back and rotor drag. The aluminum hat itself is no longer subjected to distortion from thermal expansion and contraction of the rotor, and all bolt hole alignment issues associated with rotor replacement on a used hat are fully eliminated.

Key Features:

• Bolt-Free Lug Drive System — Rotors float freely in lug-drive slots, removing all thermal stress from attachment points
• Spring-Loaded Stainless Steel Inserts — Replaceable inserts in each lug-drive slot protect the aluminum hat from wear caused by stainless steel rotor loading under brake torque
• Single Snap-Ring Retention — One large snap-ring secures the rotor to the hat for fast, tool-free assembly and installation; no torquing or safety-wiring of rotor bolts required
• Lightweight Construction — Precision-machined aluminum alloy hat paired with drilled stainless alloy rotors to minimize rotating unsprung weight
• Consistent Pedal Feel — Eliminates pad knock-back and rotor drag for predictable, repeatable braking performance
• Serviceable Design — Replaceable stainless inserts extend hat service life; easy rotor swap without bolt alignment concerns

The Wilwood 170-17941 is a component of Wilwood's Big Brake Dynamic Lug Drive system, engineered for high-performance street and competition applications where thermal management and braking consistency are critical.