With the new Ultegra RX derailleur, Shimano expands compatibility to mechanical road ... Our Allied Alfa All-Road test bikes had a compact 50/34t Dura-Ace crankset paired with an 11-32t rear cassette, ...
Ultegra Di2 and 105 Di2 are also electronic, before you move into Shimano's mechanical groupsets. These go from 105, which is 12-speed, all the way down to Claris, which has eight speeds.
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