Shimano GRX RD-RX400 Rear Derailleur 10 Speed 36T Max Medium Cage Shadow+ BF PSI Combining breathable and moisture-moving fabric

Combining breathable and moisture-moving fabric across the chest area creates additional turbulence on the jersey surface to reduce air resistance and increase your speed

steel construction with an allow sleeve for increased stiffness

Branded with a woven label at the closure

Choose from 7 different output modes

Shimano GRX RD-RX400 Rear Derailleur 10 Speed 36T Max Medium Cage Shadow+ BF PSI Combining breathable and moisture-moving fabricWith 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 prevents chain slapping and drops SHIMANO SHADOW RD+ Smooth and reliable mixed surface shifting Switch