The unsurpassed braking capacity of the Forged Narrow Superlite 6R six-piston caliper serves as the base of this group of 13”-14” big rotor kits for he popular 1963 thru 1987 Chevrolet & GM C10 / C15 Trucks with Wilwood's new 1 Piece Iron Drop Pro Spindles. FNSL6R kits are engineered application specific for simplified installation and full compatibility with OE master cylinder output and ABS functions where used. Big brake kits provide increased brake capacity and complimentary style with wheel, tire, and suspension upgrades on show trucks and high performance street or track applications. Optional caliper finishes and rotor designs simplify personalizing the style and braking requirements of any application. This kit contains hubs with a 6 x 5.50” bolt circle.