Shimano GRX Di2 Rear Derailleur (RD-RX815) cassons Flexible and efficient switching

Flexible and efficient switching

Precise and easy front derailleur adjustment

A connector rod has been added to the new Super Record™ 12X2 Speed rear derailleur

the SHIMANO GRX derailleur provides a quieter experience and shifting security and precision on mixed terrain

Inner screw fits precisely within the cap

Shimano GRX Di2 Rear Derailleur (RD-RX815) cassons Flexible and efficient switchingWith 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. The RD RX815 DI2 version offers the digital precision of SHIMANO electronic shifting and synchronized shifting. and is compatible with road cassettes with a 34T low sprocket max. Features Silent and