Improved chain security and quieter shifting when riding on gravel

With its integrated chain stabiliser, the SHIMANO GRX rear derailleur ensures quieter shifting and a more secure chain guide on uneven terrain.The RD-RX822-GS with 10-45 teeth and the RD-RX822-SGS with 10-51 teeth are compatible with SHIMANO's 12-speed MTB cassettes, so you'll never run out of gears even on the steepest jeep road or when climbing a singletrack in high mountains. The chain tensioner has an ON/OFF switch for easy wheel removal.

Functional features:

* Quiet and secure shifting on the rear derailleur on uneven terrain.
* Adjustable chain stabiliser prevents the chain from banging and jumping off
* SHIMANO SHADOW RD+
* Smooth and reliable shifting in changing terrain conditions
* Stabiliser ON-OFF switch to adapt to the terrain Features:

* Group: GRX 12 speed
* Total capacity: GS: 35 teeth/ SGS: 41 teeth
* Max. largest sprocket: GS: 45 teeth/SGS: 51 teeth
* Min. smallest sprocket: 10 teeth
* Cage length: Mid-length/Long.