Wilwood SX6R Front Kit with Black Calipers and Dynamic 15-Inch GT Rotors for Listed C5/C6 Corvette, XLR and Ridetech Hub Spindles

The 15-inch SX6R package uses black six-piston calipers, ProMatrix pads and dynamically mounted GT rotor rings. Lug-drive aluminum hats connect the rings to the specified retained hubs, covering distinct factory Corvette/XLR and custom Ridetech hub-spindle conditions. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company designs and manufactures disc brake systems and components for motorsport, street-performance and specialized applications. Its range includes calipers, brake rotors, master cylinders, valves, fittings and brake lines, with each part selected to match the complete brake system.

Technical Details

• Manufacturer part number: 140-15311.
• Mechanical package contents: no separate hubs included; mounting hardware included: Yes; spindles included: No.
• Hydraulic package contents: brake lines included: No; master cylinder included: No; booster included: No.
• Flexline specification: Line kit included (manufacturer): None; Front line-kit reference: 220-8176, 220-9100.
• Brake function and supply: Front Brake Kits - Street Performance; Disc braking; front axle; Sold as a kit.
• Rotor dimensions: outside diameter 15.00 in; 381 mm; thickness 1.25 in; 31.75 mm.
• Rotor construction and friction surface: Spec-37 Iron; Vented; GT Slotted; surface finish: Black Electro Coat.
• Service caliper assembly: SX6R; 6 pistons in each caliper; Stainless pistons; Forged Aluminium body; Radial mounting.
• Caliper color, finish and hydraulic inlet: Black; Black Powder Coat; inlet 1/8-27 NPT.
• Supplied pad compound: PM - ProMatrix.
• Wheel bolt circle: 5 X 4.5 in; 5 X 114.3 mm; 5 X 4.75 in; 5 X 120.65 mm.
• Hat wheel-stud clearance diameter: 0.520 in; 13.21 mm.
• Nominal minimum wheel diameter: 19 in; 482.6 mm; verify full spoke and barrel clearance using the kit drawing.
• Rotor mounting hat: aluminum; Type III Anodize; hat offset 0.290 in; dynamic lug drive.

Fitment & Compatibility

Use the exact model/year, trim and suspension entry below. Earlier GM models and 1963–1982 Corvette installations require Ridetech HUB spindles, not original or Ridetech pin spindles. Follow DS1284, compare full nominal 19-inch wheel clearance and select separate hoses for the actual chassis.

Models represented in the detailed applications: Chevy II, Corvette, Skylark, Special, Sportwagon, Chevelle, El Camino, 442, Cutlass, F85, Vista Cruiser, Beaumont, GTO, LeMans, Tempest, Gran Sport, Camaro, Cutlass Supreme, Firebird, GS 350, GS 400, Nova, GS, GS 455, Sprint, Ventura, Apollo, Omega, XLR. Each is subject to its individual year, trim and brake/suspension condition. Use the fitment table below to confirm year, model, trim and brake or suspension options.

Choose any alternative flexline for the actual route and chassis fittings, with enough travel and the correct flare connections.

For a fitment check, give PMB Performance the vehicle details and the actual brake and suspension hardware. Our team has over 20 years of experience working through parts compatibility.

Check the Installation instructions for the full assembly and wheel-clearance requirements.

Manufacturer Warning

Applicable to brake pads only. 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.