Shimano GRX Rear Derailleur – RD RX812 (SGS, 11-Speed)

The Shimano GRX RX812 Rear Derailleur is the highest end of the GRX Mechanical Lineup. It comes with an integrated chain stabilizer mechanism which provides quieter and smoother operation in rough terrain. The GRX RX812 is made to be abused on a gravel road and it doesn’t affect its magnificent shifting performance. The RX812 RD is compatible with current road dual control levers and can be used with an 11-Speed MTB-specific cassette (up to 42T)