Shimano Ultegra DI2 RD-R8150 Rear Derailleur

Now simplified with a single derailleur cage length, the new 12-speed Shimano RD-R8150 Ultegra rear derailleur packs the fastest, most precise shifting into a more approachable option. The Shimano RD-R8150 Ultegra 12-Speed Derailleur is compatible with 28-34T low sprockets. FEATURES Shimano's fastest-ever rear shifting, 58% faster than RD-R9150 The compact design includes an integrated wireless unit, charger, and switch LED status indicator Battery indicator Pairing Adjust mode, etc. Wider range capacity Max. low sprocket: 34T