Shimano GRX RD-RX400 GRX 10s Rear Derailleur, Shadow+ Double

The Shimano GRX RD-RX400 is a gravel-specific rear derailleur engineered for mixed-terrain riding. Its Shadow+ design keeps the chain secure and protected during rough descents and technical sections, while the 10-speed compatibility integrates seamlessly with GRX groupsets. The double-chainring setup delivers reliable shifting across a wide gear range, making it ideal for long gravel adventures where durability and consistent performance matter. Built to handle the demands of unpaved surfaces without sacrificing smooth, precise gear changes.