Shimano Ultegra RD-R8150 Di2 - 12-Speed Rear Derailleur Brakes the AMPP900 is ready for

the AMPP900 is ready for years of reliable night and day riding

see the Assegai in DoubleDown or DH casing

Designed for cyclists of all levels

Built on HollowTech II technology

Liters: 315

Shimano Ultegra RD-R8150 Di2 - 12-Speed Rear Derailleur Brakes the AMPP900 is ready forShimano Ultegra RD R8150 Di2 12 Speed Rear Derailleur The Shimano Ultegra RD R8150 is the Di2 electronic rear derailleur from the R8100 groupset delivering instant, flawless 12 speed shifting with the speed and precision that has made Di2 the benchmark for electronic drivetrains. Every shift lands perfectly, every time, whether you're sprinting for a sign or grinding up a long climb in the wet. Semi wireless Di2 architecture means clean, fast setup,