Shimano GRX Di2 RD-RX827-SGS 12-Speed Rear Derailleur

The Shimano GRX Di2 RD-RX827-SGS rear derailleur is a 12-speed wireless electronic rear derailleur for gravel, adventure and road bikes with a 1x drivetrain. It has a long cage for cassettes up to 51 teeth.

• 12-speed wireless electronic shifting, with no cables between shifters and rear derailleur
• Long SGS cage: handles 10-51T cassettes and 41T chain capacity
• Shadow ES stabilises the chain and reduces noise off-road
• Automatic Impact Recovery: the rear derailleur realigns itself after an impact
• Requires the BT-DN320 battery, sold separately. Only for 1x drivetrains with a HG 12-speed chain

Technical specifications

• System: Di2 wireless, 12-speed, 1x only
• Cage: SGS (long)
• Cassette: 10-51T; compatible with CS-M9200, CS-M9100/M9101, CS-M8200, CS-M8100, CS-M7100, CS-M6100
• Total chain capacity: 41T
• Chain: Shimano 12-speed HG
• Jockey wheels: 13/13T
• Weight: 449 g (without battery)
• Battery: BT-DN320, sold separately, not included
• Colour: Black
• Manufacturer code: IRDRX827SGSA

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.