Shimano Ultegra RD-R8150F Di2 Rear Derailleur - 12-Speed Medium Cage Includes TL-EW300 Black. With 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.