Can someone tell me what chainrings the Di2 FD is campatiable with?
Thanks,
Neal
Di2 will work just fine with most chainrings so you may see bikes with FSA cranks or even our Rotor cranks and Q-Ring with them.
I agree with Kervin in that many chainrings will work with the Di2.
I myself use ROTOR Q-rings on two different bikes, both with Di2. Both with excellent shifting!
On my Di2, I have used SRAM Red, Dura Ace 7900 and Rotor chainrings. No problems on any of them.
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Thank you very much. I have a pair of zipp 300 cranks with the associated chainrings. My sense is that these light chainrings will eventually bend with the FD power. Any recommendations on what to replace with?
I’ve had extensive problems with Di2 and Rotor 3d Crankset with Aero Q-Rings. First problem I had is with the chain getting jammed between the FD and large chainring. The solution was to raise the FD but now is shifts slow and drops the chain frequently. Just had a Shimano mechanic at the USAT Nationals work on my bike and he couldn’t resolve the issues. I realize that a pro team rides same combo but I heard that they had to file down some of the teeth on the chainring. Does that make sense and where do i start filing?
I’ve used Stronglight CT2 chain rings (Rotor 3d cranks) and Sram Red chain rings (Sram S900 cranks). I haven’t had any issues with either.
I was concerned about compatibility at first but most chain rings will work as long as the Di2 FD is set up correctly
hi psujims,
what chainring sizes are you using? and what bike is it on?
I am riding the Trek Speed Concept 9.9 with Di2 using the Quarq Cinco Rotor 3d Titanium crankset with Rotor Q 53t aero ring / 39t.
hmmm, that is interesting. I havent heard of any issues with that bike and that chainring combo. perhaps it would be best if you call me at 866-391-0493 and we can figure it out.
Short answer: properly adjusted, Di2 will work with any 10 speed rings.
Long answer:
The Di2 front derailleur shifts with more force than a typical derailleur. That is one of the reasons why the DA 7900 rings were designed to be so stiff.
I use a 7800 crankset (because I have an SRM) with my Di2, and it works fine, but it does not shift quite as well under load as it would with the 7900 rings. For example, shifting to the big ring at 500 watts is sometimes very slow. Other times it just bangs it right on there. It probably depends on whether it immediately catches the ramps. Using a 7800 chain helps a bit, as it was designed for those rings.
In a triathlon situation where you can ease up on the power for half a pedal stroke, I don’t think this will matter at all. In road racing, where you are likely attacking and needing to shift up, it can be a real issue. Having said that, some of the Sky team guys, including a couple of sprinters, ride Di2 with Osymetric rings, which are flexy and generally shift poorly.
Chris Froome who is leading the Vuelta currently rides Osymetric rings on his TT bike and his standard road bike. Bradley Wiggins, currently 3rd and tipped by many to be a real contender for the over all victory at the Vuelta rides them on his road bike and TT rig as well. Both are using Di2 to handle the shifting. The earlier Osymetric rings from several years ago were a little flimsy so I have heard. However,we changed them and they are now made from a thicker material so they are no longer “flexy”. You are also correct in that sprinters like Henderson and Sutton are winning sprints with them putting out over 1400 watts. The new generation of rings that Osymetric USA is producing in North Carolina shift fine. Shifting under full load has always been problematic for all chainrings but if you use your feet as the “clutch” and back off a little when shifting from the small ring to the big or big to small the shifting on Osymetric rings is flawless.
This is a good write up on set up and trying them out…
http://www.embrocationmagazine.com/online/product-review-osymetric-chainrings
I have a Quarq with DA 7800 rings on it that I want to swap over to my Di2 bike. I bought a 7800 chain and have 7800 cassette. I’m a triathlete and dont think I would ever be shifting from small to big ring at 500 watts (I mostly do long course), so this combination should be fine to use?
I thought about upgrading the rings, chain, and cassette to 7900, but for the price it didnt seem to make much sense, plus the time it will take to send my crank to Quarq to have it recalibrated for the 7900 rings.
Would a 7900 cassette be okay to use with 7800 rings and chain?
I am riding the Trek Speed Concept 9.9 with Di2 using the Quarq Cinco Rotor 3d Titanium crankset with Rotor Q 53t aero ring / 39t.
I have the same setup (Trek SC, Di2, Rotor Q, etc.) and mine is even more aggressive with a 52 large and a 36 small. No problems with my Di2 and rotor. Must be the mechanic. I wrench my own bikes…
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I’ve had extensive problems with Di2 and Rotor 3d Crankset with Aero Q-Rings. First problem I had is with the chain getting jammed between the FD and large chainring. The solution was to raise the FD but now is shifts slow and drops the chain frequently. Just had a Shimano mechanic at the USAT Nationals work on my bike and he couldn’t resolve the issues. I realize that a pro team rides same combo but I heard that they had to file down some of the teeth on the chainring. Does that make sense and where do i start filing?
i had the same problem although i was using rotor no-Q. but i did get the chain sucked the same way as you. took some paint off a brand new bike
Since my last post on this topic, I have played with different chainrings. I was using 7800 rings on a 7800 DA SRM, and they worked great except under high loads (400W+), where front shifting is always tricky.
I have since puts Rotor Aero Q Rings (52/36) on. Shifting is actually better. The aero versions are heavier but stiffer, and stiff is good for the Di2 FD.
On another bike with Di2 I am trying Osymetric rings. They shift okay. The extreme shape means that front shifting has to be done more carefully (eg. back off the power) and is not as quick. There are no shift ramps, and it seems to like to shift at the tall part of the ring, which only comes around twice per revolution, versus shift ramps which may happen four times per revolution.
I did not have to modify the FD with either the Q rings or the Osymetrics. With the Osymetrics, though, the tolerances are very tight between the FD and big ring to get the best shifting.
Currently running a Sram Red Quarq with Di2 and no issues with about 300 miles on it.