Fitment questions?
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Product details
A 0.560-inch offset and 3.12-inch register identify this Wilwood E36 front hat. Match the BMW brake conversion and twelve-bolt rotor connection. Bill Wood founded Wilwood Engineering in 1977, and the manufacturer is based in Camarillo, California. Wilwood designs and manufactures disc brake systems alongside calipers, master cylinders, rotors, fittings, brake lines and valves. The motorsport, street-performance and specialized ranges depend on components selected to work within a complete braking system.
Technical Details
- Manufacturer part number: 170-8815
- 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: 0.560 inch
- Rotor attachment interface: 12 x 8.75 inches; rotor attachment, separate from the hub flange
- Hub-flange mounting/clearance pattern(s): 5 x 4.75 inches; verify the actual hub and wheel-stud clearance
- Center register diameter: 3.12 inches
- Rotor mounting hole/thread designation: 1/4-20
- Internal clearance diameter: 7.75 inches
- Mounting-face thickness: 0.29 inches
- Hub-side hole clearance diameter(s): 0.520 inches; these are clearance dimensions, not wheel-stud thread sizes
Fitment & Compatibility
For BMW E36 brake conversions, compare the replacement with the actual hat and complete brake-kit instructions. A matching flange pattern alone does not establish rotor alignment or caliper clearance. Select the rotor and attachment hardware separately for the documented assembly. Follow the installation drawing for engagement and clearance at every mounting point.
Manufacturer Reference
Wilwood component specifications and dimensions
PMB Performance brings over 20 years of experience to brake-component selection. Provide the actual hardware specification when the brake system has been modified.
