Shimano GRX DI2 RD-RX815 Long Cage 11-Speed Rear Derailleur wahoopromo which means less rolling resistance

which means less rolling resistance and higher speeds

Large pedal platform

Road/MTB Approved

Compatible with all mountain bike wheel size diameters and dropper seat posts

Shimano GRX DI2 RD-RX815 Long Cage 11-Speed Rear Derailleur wahoopromo which means less rolling resistanceSHIMANO GRX DI2 Rear Derailleur SHIMANO SHADOW RD+ 34T max low sprocket 11 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. The RD RX815 DI2 version offers the digital precision of SHIMANO electronic shifting and synchronized shifting. and is