Ultegra RX RD-R8150 Di2 12 Spd. Rear Comfortable 50-series foam padding

Comfortable 50-series foam padding

Once the basket is empty

Gently adjust bent or damaged brake rotors

Its material and unique cylindrical shape ensure perfect clamping

Ultegra RX RD-R8150 Di2 12 Spd. Rear Comfortable 50-series foam paddingNow simplified with a single derailleur cage length, the new 12 speed Shimano ULTEGRA R8150 rear derailleur packs our fastest, most precise shifting into a more approachable option. With our fastest, most accurate shifting, the new 12 speed ULTEGRA R8150 rear derailleur is more versatile than ever thanks to a single cage length option that is compatible with 28 34T low sprockets. Our fastest ever rear shifting, 58% faster than RD R9150 Compact design