The introduction of a wireless interface communication system is considered 'semi-wireless' because, while there is no longer a wired connection between the controls and drivetrain, there's still a need for a central battery to connect the front and rear derailleurs. Crankarm lengths span 160 to 177.5mm and, as with the previous iteration of Dura-Ace, there is the option for an integrated power meter in the crankarms. The Japanese company made the decision to bin the 53/39T chainring option citing it was no longer commercially viable, choosing to replace it with the 54/40T option as requested by professional teams. There are two cassette options: 11-30T and 11-34T which can be mated with three chainring configurations (50/34T, 52/36T and 54/40T). Shimano overhauled its sprocket technology on the cassette with Hyperglide+, an evolution of Hyperglide providing faster, 'shockless' shifts in any gear thanks to a new ramped tooth profile and revised 'sweet spot' gearing between the sixth, seventh and eighth sprockets. The move from 11-speed to 12 was something Shimano had to follow after rivals SRAM and Campagnolo had already added an extra cog. After a nearly five-year wait, none of this was unexpected but, when it did finally arrive, it reaffirmed Shimano's place at the top of the groupsets hierarchy. Shimano's eagerly anticipated Dura-Ace R9200 upgrade delivered 12-speed, electronic-only shifting and a semi-wireless setup.
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