Wilwood 170-16858 Big Brake Dynamic Lug Drive Disc Brake Rotor Hat

The Wilwood 170-16858 is a Big Brake Dynamic Lug Drive rotor hat featuring Wilwood's advanced bolt-free rotor mounting system. Precision machined from lightweight aluminum alloy, this hat is engineered to eliminate the thermal stress and distortion problems common with traditional bolt-mounted rotor designs.

Dynamic Lug Drive System:

• Eliminates rotor mounting bolts entirely — rotors float freely within the hat
• Rotors move independently of the hat through heat cycles, removing all thermally generated stress from attachment points
• Rotors stay flatter and run truer for consistent brake response and pedal feel
• Eliminates pad knock-back and rotor drag
• Prevents hat distortion caused by rotor thermal expansion and contraction
• Eliminates bolt hole alignment issues when installing new rotors on a previously used hat

Construction & Hardware:

• Spring-loaded, replaceable stainless steel inserts in each lug-drive slot protect the aluminum hat from wear under brake torque loading
• Single large snap-ring rotor retention system — no torque wrench or safety wire required for assembly
• Stainless alloy rotor discs are additionally drilled to minimize rotating unsprung weight
• Lightweight aluminum alloy construction for reduced rotating mass

The Wilwood 170-16858 lug drive hat is designed for high-performance street and racing applications where thermal management and consistent braking performance are critical. The snap-ring retention design makes rotor swaps fast and straightforward, with no special tooling required.