Shimano GRX Rear Derailleur Shadow+ RD-RX810 - 2 x 11 Speed. Shimano Deore XT RD-M786-SGS Shadow + Rear Derailleur - Black - Long Cage. Shimano GRX Rear Derailleur Shadow+ RD-RX812 - 1 x 11 Speed. Shadow design features a super low profile and optimized slant angle for light shifting action and improved clearance.