I’m selling a brand NEW! Shimano GRX Di2 RD-RX817 SHADOW RD+ 1x 11 Speed Rear Derailleur.

This is intended for Shimano 1x 11speed drivetrains and will work with 11-42t Shimano and 10-42t SRAM 11 speed cassettes. I’ve heard anecdotal reports of it working on 11-46t cassettes but I can’t verify it as I’ve never tried it.

A great option for upgrading your road race bike or TT rig to 1x as this has the clutch cage that’ll keep your chain from coming off.