Shimano GRX RD-RX817 Di2 Rear Derailleur

The Shimano GRX RD-RX817 Di2 Rear Derailleur is a high-performance component designed specifically for gravel and adventure riding. It is part of Shimano's GRX groupset, which is tailored to meet the needs of riders who demand the very best in shifting performance on rough terrain.

The derailleur is compatible with Shimano's 11-speed drivetrains and is designed to work with cassettes with a maximum sprocket size of 42T. It features Shimano's Shadow RD+ technology, which provides a low-profile design that helps to protect the derailleur from damage and improves shifting performance.

The Shimano GRX RD-RX817 Di2 Rear Derailleur also features Shimano's clutch mechanism, which provides increased chain tension and helps to prevent chain drops, even when riding over rough terrain. This feature is particularly useful for off-road cycling, where the bike is often subjected to uneven terrain and obstacles.

The derailleur is designed for use with Shimano's electronic Di2 shifting system, which provides precise and reliable shifting performance. It is available in both short cage and medium cage versions, which allows riders to choose the best fit for their particular drivetrain and riding style. The short cage version is designed for use with tighter gear ratios, while the medium cage version is designed for use with wider gear ratios.