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Amazon.com : Shimano XTR RD-M9100-GS Rear Derailleur - 12 Speed Medium Cage Gray with Clutch : Sports & Outdoors
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Amazon.com : Shimano XTR RD-M9100 XTR 12-Speed Rear derailleur, GS Medium cage, for 10-45T/single Ring : Sports & Outdoors
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First ride review: Shimano XTR M9100 12-speed drivetrain and 4-piston brakes | ENDURO Mountainbike Magazine
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