Shimano SM-MA-R203S/S Rear Disc Brake Adapter 203 mm

The Shimano SM-MA-R203S/S rear disc brake adapter is used to fit a 203 mm disc on the rear wheel. It is made from steel and aluminium with a black finish and measures 120 mm in height and 120 mm in width.

It is designed for demanding riding: the manufacturer lists it for mountain biking, downhill, freeride, dirt jump, e-bikes and touring bikes, as well as for universal use. Before ordering, check that the fitted disc is 203 mm and that the position is at the rear, as the front fork requires a different adapter. If you are looking for more braking power at the rear of your bike, it is a simple component to add to your mounting setup.

Founded in 1921 in Sakai, Japan, by Shozaburo Shimano, Shimano is still based in the same city today. For cyclists, it makes drivetrains, brakes, wheels, pedals and cycling shoes. Its history in bicycle components began with the production of freewheels in 1922.