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The 2 bikes that i ride most have the latest 11speed Shimano groupsets
one is Di2 the other Ultegra manual, both are vast improvements over the the 9speed Ultegra that was used prior.
Each has it's charms and i have no complaints about either. The new stiff whether electric or manual is so precise and easy to use that you would be happy w/ either. The big difference is the 11speed gear sets compared to the older 9s and the modern crank chainrings, I do miss the older regular 53/39 for high speed downhills and flats, and you can get these for use w/ the modern stuff, but my Di2 has a compact 54/39 and the Ultegra a semi compact 52/36. The compact and semicompact are great for the hills and the semicompact w/11 is almost as good as the old regular w/ 9
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