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. The 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 uninterrupted rear shifting on rough terrain. Adjustable chain stabilizer prevents chain slapping and drops. Shimano Shadow RD+. Smooth and reliable mixed surface shifting. Switch stabilizer ON/OFF to match the terrain. Gravel-tuned clutch...
Best Price: £139.99 from Merlin Cycles