Shimano Deore XT RD-M8200 12-Speed SGS Long Cage Rear Derailleur Built for a modern 12-speed mountain bike drivetrain, this mechanical rear derailleur combines a low-profile Shadow ES layout with direct cable routing. The compact shape improves trail clearance and reduces exposure to impacts and snagging. Shadow ES uses a dual-spring stabilising mechanism to control cage movement and maintain firmer chain engagement over rough ground. Reduced chain bounce supports quieter running, more consistent shifting and dependable retention through technical terrain. The optimised slant angle and strong return spring help the derailleur track the cassette accurately. Cold-forged alloy links and coated pivot bushings are designed to withstand repeated shifting loads while retaining a positive lever feel. The SGS Long Cage cage is matched to a maximum sprocket of 51T and a total capacity of 41T. Correct cassette, chain and shifter selection are required for the derailleur to operate across the intended range. Features Shadow ES low-profile architecture improves impact clearance on rough trails. Dual-spring chain stabilisation reduces chain bounce and supports secure engagement. Direct cable routing reduces exposure to trail-side snagging. Cold-forged alloy links and pivot body provide strength under repeated shifting loads. Coated link-pin bushings support smooth movement and long-term durability. Solid pulleys help restrict debris entry in muddy conditions. SGS Long Cage cage supports the specified 10-51T cassette range. Maximum low sprocket of 51T is matched to the stated drivetrain. Specifications Feature Specification Product type Mechanical Rear Derailleur Series Deore XT Model RD-M8200 Drivetrain 12-speed MTB Cage SGS Long Cage Maximum low sprocket 51T Total capacity 41T Recommended cassette range 10-51T Technology Shadow ES Cable routing Direct Compatibility Compatible with: Compatible with the specified Shimano 12-speed mountain bike drivetrain. Designed around a 10-51T cassette range. Requires a compatible Shimano mechanical shifter and chain. Frame must use a compatible standard rear derailleur hanger. Technical Notes Set the high and low limit screws, cable tension and B-gap during installation. Confirm cassette range and total drivetrain capacity before fitting. A correctly sized chain is required for safe operation across the full gear range. Ideal For Ideal for trail and all-mountain riders who require a durable 12-speed mechanical rear derailleur with controlled chain movement, low-profile protection and compatibility with a 10-51T cassette.