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Product details
Wilwood's inset front hat requires a wheel mounting pad no larger than six inches. Verify 0.230-inch offset and the 12 x 8.25-inch rotor circle. Wilwood Engineering, founded in 1977 by Bill Wood, is based in Camarillo, California. The company designs and manufactures disc brake systems and supplies master cylinders, calipers, brake rotors, valves, fittings and lines for motorsport, street-performance and specialized installations. Select each component around the complete system’s requirements.
Technical Details
- Manufacturer part number: 170-12390
- Manufacturer-listed attachment hardware reference: 230-8008; verify the specific rotor and attachment arrangement before ordering hardware
- Manufacturer installation note: Wheel mounting pad must not be larger than 6.00" to fit into inset area of this hat.
- 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: 0.230 inch
- Rotor attachment interface: 12 x 8.25 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: 2.78 inches
- Rotor mounting hole/thread designation: 1/4-20
- Internal clearance diameter: 7.75 inches
- Mounting-face thickness: 0.30 inches
- Hub-side hole clearance diameter(s): 0.520 inches; these are clearance dimensions, not wheel-stud thread sizes
Fitment & Compatibility
For Matched twelve-bolt brake systems, 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
Our team at PMB Performance has over 20 years of parts and fitment experience. The existing component number and brake-system details help us check the match.
