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Product details
A 12 x 10.75-inch rotor circle identifies this Wilwood GM 1500 front hat. Match its 0.810-inch offset, six-hole flange and 3.09-inch register. Founded in 1977 under Bill Wood, Wilwood Engineering operates from Camarillo, California. The company designs and manufactures disc braking systems and components, including calipers, master cylinders, brake rotors, fittings, valves and brake lines. Its motorsport, specialized and street-performance range requires individual parts matched to the complete braking arrangement.
Technical Details
- Manufacturer part number: 170-8960
- Rotor mounting method: Fixed Mount
- Position in the specified brake assembly: Front
- Hat offset: 0.810 inch
- Rotor attachment interface: 12 x 10.75 inches; rotor attachment, separate from the hub flange
- Hub-flange mounting/clearance pattern(s): 6 X 5.50 inches; verify the actual hub and wheel-stud clearance
- Center register diameter: 3.09 inches
- Rotor mounting hole/thread designation: 5/16-18
- Internal clearance diameter: 7.21 inches
- Mounting-face thickness: 0.45 inches
- Hub-side hole clearance diameter(s): 0.630 inches; these are clearance dimensions, not wheel-stud thread sizes
- Manufacturer-listed attachment hardware reference: 230-12176; verify the specific rotor and attachment arrangement before ordering hardware
- Component: Truck Brake Rotor Hat
- Material: Aluminum
- Surface finish: Black E-Coat
Fitment & Compatibility
The front GM 1500 assembly must provide the same 3.09-inch register and six-on-5.50-inch flange. This hat takes a large twelve-on-10.75-inch rotor interface, distinct from the truck's wheel-side mounting arrangement. Check the 0.810-inch offset and 0.45-inch face with the hub and caliper geometry; this is a conversion component rather than a complete brake kit.
Manufacturer Reference
Wilwood component specifications and dimensions
PMB Performance can help identify the required brake component with over 20 years of parts experience. Send the kit details and original-part measurements.
