Shimano Dura-Ace RD-R9150-SS Di2 Rear Derailleur – 11-Speed, Short Cage, Black

Description

Shimano’s Dura Ace R9150 Di2 Rear Derailleur continues the evolution of cycling’s cutting edge drivetrain performance. Dura Ace 9150 is the pinnacle of Shimano’s electronic drivetrain groups, and offers the fastest, most forgiving shifting in the lightest, stiffest package they offer. If you want to ride what the pros do, Dura Ace Di2 is it. Di2 has been tweaked and refined over several generations, and 9150 is at the top of the phylogenetic tree. Delivering the best shifting in existence, Di2 lets you shift safely under power, make multiple precise gear jumps, and even gives the option of synchronized shifting, in which you shift the rear derailleur and the system chooses the best gear, automatically and seamlessly shifting the front derailleur and rear derailleur to achieve it. Borrowing from Shimano’s MTB rear derailleurs, the R9150 is the first road model with the low profile Shadow design. Shadow moves the derailleur closer to the bike, reducing the chance of striking an object, decreasing shift response time, and even improving the overall aerodynamics of your bike. A carbon fiber cage holds 11-tooth pulleys spinning on ceramic bearings for smooth, quiet performance.