GRX RD-RX815 Di2

The GRX RD-RX815 Di2 Rear Derailleur is designed for 1x drivetrains, bringing precise electronic shifting to your gravel or adventure bike. Built by Shimano, this rear derailleur offers dependable performance for riders who demand smooth, consistent gear changes on varied terrain.

• Compatible with 1x drivetrains for simplified, reliable shifting.
• Available in two configurations to suit different cassettes: one option supports a largest cog of 34 teeth with a 38-tooth chain wrap capacity, while the other supports a largest cog of 42 teeth with a 31-tooth chain wrap capacity.
• Di2 electronic shifting provides fast, accurate gear changes with minimal effort.
• Engineered for gravel riding, offering robust performance in demanding conditions.