Shimano R203P/S Disc Brake Adaptor for 203mm Rotor, 74mm Caliper, 51mm Frame Bike Accessories_Crankset and thin enough to wear

and thin enough to wear under your helmet for a little extra warmth

Black anodized finish

Resistance Unit: Fast-response electromagnetic

Featherweight carbon sole elevates stiffness to 10 out of 12

it's an excellent choice for riders seeking adventure and excitement on the trails

Shimano R203P/S Disc Brake Adaptor for 203mm Rotor, 74mm Caliper, 51mm Frame Bike Accessories_Crankset and thin enough to wearShimano Disc Brake Adaptors allow the use of different sized rotors to your frame or fork. For 74mm caliper on 51mm frame, using 203mm rotor Includes mounting hardware Brake Caliper Type: Post Mount Mount Rotor Size: Rear IS 203 Rotor Weight: 21 grams