Components: Shimano Dura-Ace Di2 9000
Progression: The best shifting in a cleaner package
The electronic groupset with sublime shift performance gets an overhaul in 2013. Key upgrades over the current version include a cleaner, more simplistic wiring setup that also allows for easier addition or subtraction of extra shifters than the current version. Every aspect of the kit—braking power and modulation, front shift throw, chainring stiffness, weight and others—improve slightly and the kit jumps from 10 gears in the rear to 11.