This article first appeared on BikeRadar.
Shimano has lifted the lid on the latest versions of its flagship Dura-Ace mechanical and electronic road groupsets. Officially known as Dura-Ace R9100 (mechanical) or R9150 Di2 (electronic), the groups push several firsts for Shimano on the road side including the options of an integrated power-meter, hydraulic disc braking and the migration of Shimano's clever synchronised shifting technology.
Let's clear a couple of things up before we move on. Dura-Ace will continue to be available in electronic (Di2) and mechanical options, and both will remain 11-speed. Along similar lines, Dura-Ace Di2 will not be wireless in a traditional sense, although it does feature some wireless functionality, which we'll explain in more detail below.
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Numerous configurations mean that regardless of whether a rider wants disc or rim brakes, mechanical or electronic shifting or the option to run a TT handlebar, the compatibility is now there.
Power meter inside
Dura-Ace's latest Hollowtech II crankset is available with (FC-R9100-P) our without (FC-R9100) a power meter and in a wide variety of gear options and with seven crank arm lengths ranging from 165 to 180mm.
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