Shimano XT RD-M8100 12-Speed Rear Derailleur

With a Shimano XT RD-M8100 12-Speed Rear Derailleur in charge of your shifts, it doesn't matter if you hit the bottom of a climb out at the smaller end of your cassette: a couple clicks of the lever and you'll be spinning uphill in your 51 tooth pie plate without a care in the world. Known for crisp shifting--even when you're putting the power down--an XT rear derailleur is always a fine choice.