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Product details
This Wilwood GTO front hat uses a 5 x 4.72-inch flange, 1.000-inch offset and 2.82-inch register. Confirm the twelve-bolt rotor assembly. The manufacturer, Wilwood Engineering, was established by Bill Wood in 1977 and is based in Camarillo, California. It designs and builds disc brake systems with a range covering calipers, brake rotors, master cylinders, valves, fittings and brake lines. Motorsport, street-performance and specialized applications require components selected for the complete braking system.
Technical Details
- Manufacturer part number: 170-8757
- Hub-side hole clearance diameter(s): 0.500 inches; these are clearance dimensions, not wheel-stud thread sizes
- Manufacturer-listed attachment hardware reference: 230-4572; verify the specific rotor and attachment arrangement before ordering hardware
- Component: Short-Offset Brake Rotor Hat
- Material: Aluminum
- Surface finish: Black E-Coat
- Rotor mounting method: Fixed Mount
- Position in the specified brake assembly: Front
- Hat offset: 1.000 inch
- Rotor attachment interface: 12 x 8.75 inches; rotor attachment, separate from the hub flange
- Hub-flange mounting/clearance pattern(s): 5 x 4.72 inches; verify the actual hub and wheel-stud clearance
- Center register diameter: 2.82 inches
- Rotor mounting hole/thread designation: 1/4-20
- Internal clearance diameter: 7.75 inches
- Mounting-face thickness: 0.39 inches
Fitment & Compatibility
The front GTO conversion uses a 2.82-inch center register on this hat. Confirm the nominal 5 x 4.72-inch hub-side clearance pattern and the one-inch offset, including the 0.39-inch face in the assembly stack. A twelve-bolt ring mounts independently at the outer edge. Verify the original hat and installed brake kit before ordering a replacement.
Manufacturer Reference
Wilwood component specifications and dimensions
Contact PMB Performance with the brake-kit identification and measurements for help selecting the part. Our team brings over 20 years of experience.
