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Product details
Fourteen-inch GT slotted rotors define the larger front-brake envelope of this black Narrow Superlite 6R hub kit. It is designed around Wilwood ProSpindles and includes the rotor hats and hubs, making wheel clearance and outward hub position important checks before assembly. Calipers, brake rotors, master cylinders, valves, fittings and brake lines form Wilwood Engineering’s disc brake range. Bill Wood founded the Camarillo, California company in 1977; it designs and manufactures systems for motorsport, street-performance and specialized applications. Matching the component to the rest of the brake package is fundamental to selection.
Technical Details
- Manufacturer part number: 140-9920
- Wheel-diameter guide: 18 inches; actual wheel must pass the manufacturer clearance template
- Supported spindles: Wilwood standard-height ProSpindle 830-10832 or two-inch-drop ProSpindle 830-9807; spindles sold separately
- Included hub patterns: 5 x 4.50 inches (5 x 114.3 mm) and 5 x 4.75 inches (5 x 120.65 mm); 1/2-20 wheel studs
- Published OE hub offset: +0.68 inch per side; account for outward wheel movement
- Included: hubs, bearings, seals, dust caps and brake mounting hardware; separate rotor hats included
- Not included: spindles, master cylinder, booster or brake flexlines
- Rotor ventilation: 72 curved vanes
- Position and package: front brake and hub kit; one kit services both sides
- Calipers: Forged Narrow Superlite 6R, 6 pistons, forged aluminum bodies with stainless-steel pistons
- Finish: Black Powder Coat
- Rotors: 14.00 x 1.10 inches, vented Spec-37 iron; GT Slotted faces
- Caliper mounting: radial; hydraulic inlet 1/8-27 NPT
- Included friction: BP10 pads
Fitment & Compatibility
Compare the intended wheel with the complete clearance diagram, allowing for the caliper’s radial and spoke envelope. Brake lines are separate; original rubber hoses do not adapt directly. Select the correct 1/8-27 NPT caliper connection and flexline length, and check for interference through suspension travel and full steering movement.
Both supported ProSpindle heights are covered, but their bracket and steering-arm assembly steps differ. Identify the spindle first, then use the corresponding installation figures; a similar-looking original spindle is not an automatic substitute. Compatible spindle part numbers are 830-10832 for standard height and 830-9807 for the two-inch drop. The published +0.68-inch hub offset is per side and must be included in the wheel/fender clearance assessment.
Wilwood kit specifications · Manufacturer installation instructions and wheel-clearance diagram.
PMB Performance has over 20 years of experience working through brake fitment. Contact us with the vehicle’s actual brake hardware and wheel measurements if you need assistance selecting the correct package.
WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.
