Ultegra RD-R8150 Di2 12-Speed Rear Derailleur Options:Ultegra RD-R8150E Di2 Rear Derailleur - 12-Speed, Medium Cage, Includes TL-EW300, Black Designed to absorb shocks and

Designed to absorb shocks and smooth out the ride

350 lumens packed into a compact form

This design achieved the ideal balance of foam padding with ergonomic relief channel

An adjustable waist lets you get the right fit

Ultegra RD-R8150 Di2 12-Speed Rear Derailleur Options:Ultegra RD-R8150E Di2 Rear Derailleur - 12-Speed, Medium Cage, Includes TL-EW300, Black Designed to absorb shocks andWith the fast and accurate Di2 shifting technology, the Shimano 12 speed Ultegra RD R8150 rear derailleur is extremely versatile thanks to a single cage length option compatible with 11 28, 11 30, and 11 34 cassettes. Compact design includes an integrated wireless unit, charger, switch Wider range capacity Max. low sprocket 34t LED status indicator Battery indicator, pairing, adjust mode etc.