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Hayes Post Disc Brake Adaptor for IS Mount Rear 203mm Rotor Diameter CheckoutTitle=Full Speed Ahead SL-K Compact Drop Handlebar - Carbon }Shimano Alfine SG-S700 Outer ReceiverHayes Post Disc Brake Adaptor for IS Mount Rear 203mm Rotor Diameter. Disc brake adaptors to fit standard post mount brakes to a variety of fork and frame mounts. Includes mounting bolts TECH SPECS Brake Caliper Type Post Mount Weight 44 Mount Rotor Size Rear IS 203 Rotor