Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
Six rotor mounts on a 6.25-inch circle define this Wilwood Fiat 500 rear hat. Match the 0.640-inch offset to the correct rear conversion. Established in 1977 by Bill Wood, Camarillo, California-based Wilwood Engineering designs and manufactures disc brake systems. Its master cylinders, calipers, brake rotors, lines, fittings and valves support motorsport, street-performance and specialized applications, with each component selected for its role in the complete brake system.
Technical Details
- Manufacturer part number: 170-12770
- Manufacturer-listed attachment hardware reference: 230-12120; verify the specific rotor and attachment arrangement before ordering hardware
- Manufacturer installation note: 3.06 " diameter register with counterbore for register ring.
- Component: Short-Offset Brake Rotor Hat
- Material: Aluminum
- Surface finish: Black E-Coat
- Rotor mounting method: Fixed Mount
- Position in the specified brake assembly: Rear
- Hat offset: 0.640 inch
- Rotor attachment interface: 6 x 6.25 inches; rotor attachment, separate from the hub flange
- Hub-flange mounting/clearance pattern(s): 4 x 3.86 inches; verify the actual hub and wheel-stud clearance
- Center register diameter: 3.06 inches
- Rotor mounting hole/thread designation: 5/16-18
- Internal clearance diameter: 5.20 inches
- Mounting-face thickness: 0.25 inches
- Hub-side hole clearance diameter(s): 0.500 inches; these are clearance dimensions, not wheel-stud thread sizes
Fitment & Compatibility
This is a component for Fiat 500 brake conversions, not a complete brake kit. Check the hub location, rotor mounting surface and caliper alignment as a system before ordering. 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.
