The 12-speed ULTEGRA R8150 rear derailleur from SHIMANO offers the fastest and most precise shifting function in the industry at an attractive price, and simplifies selection through the uniform cage length. While it guarantees the fastest and most precise shifting function on the market, the new 12-speed ULTEGRA R8150 rear derailleur is also more versatile than ever. The reason for this is the uniform cage length, which is compatible with 11-28, 11-30, and 11-34T cassettes.