Starlite "55" hubs feature the strength of our traditional eight bolt aluminum hub with an all-new design forcused on maximized weight reduction. Computer FEA analysis and design technology were applied to reconfigure the existing hub and its related components in order to achieve an effective lightweight design. Each hub is permanent mold cast using a high strength aircraft alloy. The resulting weight of the Starlite "55" hub, with studs and bearing races installed, is 6. 99 pounds. With the optional drilled lightweight wheel studs, the weight drops to 6. 71 pounds. That's nearly a pound lighter than eight bolt aluminum hubs, and lighter than some magnesium hubs!To further reduce overall weight, Starlite "55" hubs have been designed for use with a five bolt drive flange. The drive flanges are CNC machined from high strength 7075-T6 aluminum billets and are available in either a standard or lightweight configuration. a drilled stud hub can be run with the lightweight drive flange at a combined assembly weight of 7. 6 pounds! That's less than or equal to the weight of any magnesium hub combined with an eight bolt drive flange. It's also considerably stronger, and more economically priced. Each drive flange kit includes the drive bolts and lockwashers. The bolts are manufactured from a heat treated, lightweight steel alloy that is stronger than a grade 8 cap screw. The bolts feature 12 point heads and are lock wire drilled for additional safety. Starlite "55" hubs are available in standard and GM rotor offset and mounting dimensions. They are shipped with bearing races installed, and your choice of standard or lightweight drilled wheel studs. Bearings, seals, and spindle lock nuts are all interchangeable with conventional wide 5 hubs. New five bolt drive flanges are the only special parts required when updating from an eight bolt hub. Starlite "55" Snap-Cap front hubs have had the flange bolt bosses removed, and the hub is machined to accept a fiber reinforced composite Snap-Cap hub cap. With standard studs the hub weighs in at 6. 85 pounds. With the lightweight studs, it weighs 6. 57 pounds. That's lighter than some magnesium hubs, considerably stronger and more economically priced.Pit Stop USA offers Wilwood Starlite "55" Wide 5 Racing Rear Hub - 5/8" Coarse Studs - Drilled - (Fits Wilwood Calipers) 270-6513D at low everyday prices. Be sure to check out all of our products from Wilwood Engineering including Wilwood Engineering Wide 5 Hubs and Wilwood Engineering Hubs.