Shimano GRX RD-RX400 10-Speed Rear Derailleur Size_700x18c 4 in or 7

4 in or 7

Protective - Internal orange foam protects your items and reduces noise

11T Top sprocket_Min

Because it folds it’s much easier to maneuver

Shimano GRX RD-RX400 10-Speed Rear Derailleur Size_700x18c 4 in or 7SHIMANO GRX Rear Derailleur 10 speed RD RX400 SHIMANO GRX Rear Derailleur SHIMANO SHADOW RD+ 10 speed With an integrated chain stabilizer mechanism, the SHIMANO GRX derailleur provides a quieter experience and shifting security and precision on mixed terrain. For rides on smooth surfaces, the derailleur features and ON OFF switch for the chain tensioner. FEATURES Silent and uninterrupted rear shifting on rough terrain Adjustable chain stabilizer