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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.
Shimano’s latest and greatest Ultegra 12-speed Di2 drivetrain delivers next generation shifting and overall performance. Every aspect of the new drivetrain is a substantial step up from the previous generation, with even the rear derailleur seeing improvements. The Ultegra R8150 Di2 rear derailleur features ridiculously fast shifting with the derailleur being a whopping 58% faster than the previous generation Dura-Ace. This massive jump in shifting speed gives you the competitive edge when it’s time to sprint for the finish. Compatibility has been expanded upon with just the single cage length being able to cover 28-34t low sprockets, ensuring compatibility with your favorite gearing setup.