Ultegra RX, GS 11 Spd. Di2 GRX Power Glide technologyHeat treated steelWeight:

Power Glide technologyHeat treated steelWeight: 229g for 11-26TCompatibility: PC-1170

Instinct BC Carbon 2019

It attaches to the saddle easily via hook-and-loop straps

Shimano Deore XT quality to complete your 1x11 speed drivetrain

Ultegra RX, GS 11 Spd. Di2 GRX Power Glide technologyHeat treated steelWeight:With an integrated chain stabilizer mechanism, the ULTEGRA RX 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 RX805 DI2 version offers the digital precision of SHIMANO electronic shifting and synchronized shifting. CAGE LENGTH: GS Medium TOTAL CAPACITY: 39T MAX FRONT DIFFERENCE: 16 AVERAGE WEIGHT: 280g