GRX RD-RX815 Di2

Get precise electronic shifting for your 1x drivetrain with the Shimano GRX RD-RX815 Di2 rear derailleur. Built to handle demanding rides, this component is part of Shimano's GRX lineup and is designed for smooth, reliable performance on mixed terrain.

• Di2 electronic shifting offers fast, accurate gear changes at the push of a button.
• For 1x drivetrains, the RD-RX815 simplifies your setup while maintaining strong chain retention.
• Available in two versions to match your gearing needs: a 38-tooth chain wrap capacity for up to a 34-tooth largest cog (IRDRX815), or a 31-tooth wrap capacity for up to a 42-tooth largest cog (IRDRX817).
• Part of the Shimano GRX family, designed specifically for gravel and adventure riding.