Ultegra RX, GS 11 Spd. Di2 GRX It attaches to the saddle

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

the ISOMETRICTM design increases the sweet spot by 7%*

V-Matrix Technology creates larger sweet spot for increased power

The Cambium C15 Carved shares the same narrower shape as the existing Cambium C15

Sunlight resistant

Ultegra RX, GS 11 Spd. Di2 GRX It attaches to the saddleWith 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