- New
Shimano Ultegra Di2 RD-R8150, a premium 12-speed electronic road bicycle rear derailleur
Speed: 12-speed drivetrain compatible.Shifting
Type: Di2 electronic (wireless to shifters, wired to internal battery).
Shifting Speed: 58% faster than the previous generation Dura-Ace RD-R9150.Cassette
Compatibility: Single cage design optimized for 11-30T and 11-34T cassettes.
Total Capacity: 39 teeth.Maximum Front Difference: 16 teeth.Average Weight: 262 grams.
Design Profile: Shimano Shadow RD low-profile construction to prevent chainstay damage.