Shimano GRX RD-RX400 Rear Derailleur 10 Speed 36T Max Medium Cage Shadow+ BF PSI A state-of-the-art high-pressure molding process

A state-of-the-art high-pressure molding process used to produce complex-shaped carbon fiber components creates a unique two piece saddle frame that yields the perfect balance of support and comfort

Unobtainium® grippers hold eyewear stems in place

steel construction with an allow sleeve for increased stiffness

Branded with a woven label at the closure

Shimano GRX RD-RX400 Rear Derailleur 10 Speed 36T Max Medium Cage Shadow+ BF PSI A state-of-the-art high-pressure molding processWith 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