Intro Shimano Ultegra R8100 & Dura-Ace R9200 | Sigma
Sep 01, 2021 The first major talking point with the new Dura-Ace R9200 and Ultegra R8100 groupsets is that the Di2 gear shifting now adopts a semi-wireless format. This configuration includes wireless STI levers that send gear change signals to the rear derailleur. The rear derailleur acts as the system’s brain, and is subsequently hard wired to the front
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