The Shimano XTR RD-M9100-SGS is the king of mechanical 12-speed mountain bike drivetrains, featuring a long cage (SGS). The derailleur′s design focuses on decreasing tension in the lower gear positions, which improves the chain line and makes operation even quieter. Larger 13-tooth pulley wheels, combined with Shimano′s Shadow RD+ clutch system, keep the chain securely engaged through roots and rock gardens—minimizing chain slap against the frame and preventing dropped chains entirely. Thanks to the long cage, the derailleur works seamlessly and lightning-fast with wide-range 10–51T cassettes, offering the best shifting precision on the market.
Technical Specifications
Model: RD-M9100-SGS (XTR M9100 Series).
Drivetrain: 12-speed, mechanical.
Cage Length: Long cage (SGS).
Compatibility: Optimized for Shimano 12s 10-51T cassettes (for 1×12 drivetrain setups).
Technologies: Shadow RD+ (integrated chain stabilizer/clutch).
Pulleys: 13-tooth with sealed bearings.
Suomi

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