Shimano Ultegra RD-R8150 Di2 Rear Derailleur - 12-Speed

The Shimano 12-speed Ultegra RD-R8150 rear derailleur has a compact design with an integrated wireless unit, charger, and switch. It is versatile with a single cage length compatible with 11-28, 11-30, and 11-34 cassettes. It also features a wider range capacity, max low sprocket 34t, LED status indicator, and battery indicator.