Shimano XTR R180P/S Disc Brake Adaptor 180mm Rotor 74mm Caliper 51mm Frame Rear Axle-QR x 145mm Spring tension can be adjusted

Spring tension can be adjusted in both pivots to center the brake and to adjust the strength of the return swing

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Shimano XTR R180P/S Disc Brake Adaptor 180mm Rotor 74mm Caliper 51mm Frame Rear Axle-QR x 145mm Spring tension can be adjustedShimano XTR R180P S Disc Brake Adaptor for 180mm Rotor 74mm Caliper 51mm Frame. Shimano Disc Brake Adaptors allow the use of different sized rotors to your frame or fork. TECH SPECS Brake Caliper Type Post Mount Mount Rotor Size Rear IS 180 Rotor