Shimano XTR RD-M9120 12-Speed Long Cage Rear Derailleur

The Shimano XTR RD-M9120 rear derailleur is the SGS long cage version, designed for a 12-speed drivetrain with a double crankset (2x). With a total capacity of 41 teeth and a maximum sprocket size of 45 teeth, it covers a wide gear range, useful on routes with long or demanding climbs. If your combination of chainrings and sprockets exceeds the capacity of a short cage, the SGS long cage is the right choice: always check that the total stays within the stated 41 teeth.

The rear derailleur works with HG+ 12-speed chains, such as the CN-M9100, and includes 13-tooth jockey wheels with sealed bearings. The stated weight is approximately 240 g.

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.