28T for the 9000, while the R8000 Ultegra rear derailleur will handle up to 34T (vs. The R9100 Dura-Ace rear derailleur will handle up to a 30T cassette, vs. There are two functional differences between DA and Ultegra, both non electronic related. Shimano announced the current iteration of Dura-Ace, the R9100 series, in mid 2016 and the current Ultegra, R8000, about 6 months later. The styling of the groups is more gray than the prior version and the rear derailleur has more of a mountain bike rear-derailleur design (Shadow). And of course there is a battery, which I've mounted inside the seatpost. I've mounted mine under the handlebar stem. There is also a junction box where the shifter wires and the power wire meet. Back when I first went with Di2, there was one functional difference: the DA shifters have a hidden button on the top of the hoods that can operate a bike computer if you also have the D-Fly accessory (which I do), while the Ultegra shifters don't. But in the current Ultegra generation, the R8000, the levers do have the hidden button.Ĭompared to the mechanical groupset, the Di2 shifters are a little bigger and stick out further (which led to a shorter reach handlebar), the front derailleur is quite a bit bigger since it holds a powerful motor, and there are no cables to the derailleur. The DA is lighter, more expensive, and I think nicer looking. Functionally, I can't tell the difference between the two. I’ve had both Dura-Ace (DA) and Ultegra Di2. I typically ride either mid-compact or compact lately, more the compact as I get a little older and also am focusing on increasing my cadence. In the past, you had to change the whole crank to get different ring sizes. The first few times I used the brakes I almost went over the handlebars, so quick and strong was the braking action.Īnother thing I really like about the groupset is that the crank takes any size chainrings: standard (53-39), mid-compact (52-36), and compact (50-34). The brakes are a revelation compared to the Campy Record brakes I previously used. In fact, we did build up a bike for travel for her with mechanical, and she disliked it so much, we changed it over to Di2.īeyond the electronic aspect, there are other things I really like about the Dura-Ace and Ultegra level groupsets. She doesn’t want to ride mechanical again. She reluctantly agreed and now she absolutely loves it. When she got her new bike, I was an evangelist by that point and I pushed hard to convince her to try electronic (ah, let’s tell the truth, I strong-armed her). My wife was also an electronic shifting skeptic. Every time I shift, a little smile comes on my face. Think about shifting and it happens, right away, every time. Now, with Di2, the bike's gears, front and rear, feel like they are directly connected to my brain. No more worrying about dropping the chain, no more "Oh crap" moments when you're in the wrong chainring and can't shift safely. What's especially nice with Di2 is the front shifting.
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With Di2, you can shift under full power at a bad time, front or rear, make a really bad shift if it were mechanical that would result in a dropped chain or jammed gear, and it all shifts perfectly. They have two group sets with Di2, Ultegra and the top of line Dura-Ace. Shimano calls their electronic shifting Di2. And like the newly converted, I preach the gospel. The arguments remain valid but it's such a joy to have a perfect shift every time. There are a lot of good arguments against electronic shifting. Bam! It gave the same feeling as dual-clutch paddle shifting on a high performance car. Precise, fast shifts, every time, front and rear, even under full load. I reluctantly gave it a ride and I was smitten, both by the bike and as much or more so, with how beautifully it shifted. The only one the shop had in my size had Shimano Ultegra Di2 on it. One of the bikes I wanted to demo was a Parlee Z5. Then, a few years ago, I busted the frame on my Pinarello and went to a local shop to test ride some new bikes. I felt even a little smug about the "purity" of mechanical shifting. Electronic shifting struck me as a complicated solution to a non-problem.
I had been on Shimano mechanical for many years and then Campagnolo Record mechanical (10 and then 11 speed) and was very satisfied. I was an electronic shifting skeptic for years. Top of my list is Shimano Di2 electronic shifting. Some of these have been around quite a while, some I’ve just started to use in the last year or two. I’ve been thinking about what my 10 favorite road bike products are.
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