Wilwood Front Black Superlite 6R Kit, 13.06-Inch GT Rotors — Corvette C5/C6 (1997–2013), XLR (2004–2009) and Selected GM (1962–1982) with Ridetech Hub Spindles

The black Superlite 6R front package combines 13.06-inch GT-slotted rotors with BP-20 pads. It serves the listed Corvette and XLR hubs as well as qualified classic GM applications fitted with the specified Ridetech hub spindles. Bill Wood founded Wilwood Engineering in 1977; the company is based in Camarillo, California. Wilwood designs and manufactures calipers, brake rotors, master cylinders, valves, fittings and brake lines as part of its disc brake systems and component range for motorsport, street-performance and specialized applications. Each component must suit the requirements of the complete brake installation.

Technical Details

• Manufacturer part number: 140-8921
• Service calipers: 6-piston Forged Narrow Superlite 6R; Black Powder Coat; radial mounting
• Brake rotors: 13.06 x 1.25 inches; Spec-37 Iron; GT Slotted; vented
• Included pad compound: BP-20; pistons: stainless steel
• Caliper body: Forged aluminum; hydraulic inlet: 1/8-27 NPT
• Rotor surface finish: Black Electro Coat; rotors are not supplied burnished
• Rotor/hat wheel-stud clearance pattern(s): 5 x 4.5 in; 5 x 114.3 mm; 5 x 4.75 in; 5 x 120.65 mm; the existing hub/axle pattern is retained
• Hat/rotor stud-hole clearance: 0.520 in; 13.21 mm; this is not a wheel-stud thread designation
• Hydraulic hoses: not included; match the separate lines and fittings to the application
• Kit includes calipers, rotors and mounting hardware; replacement hubs and spindles are not included
• Not included: master cylinder and brake booster
• Wheel clearance: 17-inch wheels may fit; check the complete manufacturer caliper/rotor template
• Quantity: sold as one axle kit

Fitment & Compatibility

For 1997–2013 Chevrolet Corvette C5/C6 and 2004–2009 Cadillac XLR applications as listed. The classic 1962–1982 GM entries require the specified Ridetech hub spindles; they are not approvals for those vehicles’ original spindles. Match the exact Corvette/XLR brake package or the installed aftermarket spindle before purchase.

The 13.06-inch package retains the existing hub. Use DS502 and its wheel template to confirm clearance and bracket alignment. Hydraulic lines are separate and must suit the specific chassis; Corvette hose references must not be assumed suitable for a modified classic GM car.

Use the fitment table below to confirm the exact model, year, trim and all numbered application notes.

Manufacturer Resources

• Wilwood kit specifications and wheel-clearance information
• Installation instructions and component list

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.

For fitment help, contact PMB Performance with your VIN and details of any axle, spindle or brake changes. Our team has over 20 years of experience checking parts and fitment, including the dimensions that a model-year search cannot establish.

Vehicle Applications

Application Notes

1. Universal Flexline kits available: 220-7056 (14"), 220-7699 (16") or 220-8307 (18"). Choose correct length for your application.
2. This front brake kit contains no parking-brake mechanism. Parking-brake cable selection belongs to the separate rear brake installation.
3. Line kit included (manufacturer): None
4. Front line-kit reference: 220-8176, 220-9100, , , 220-12168