I have a Dura ace FC7900 crankset and was wondering If I can use it on a bicycle with ultegra 11 speed group?

The crankset I have is this one: http://www.bike-discount.de/en/buy/shimano-dura-ace-crankset-fc-7900-53-39-170mm-31545



The FC7900 crankset is from a 10 speed group.

Nobody's going to stop you from doing this and having it work -- Zinn has done it and claims that it works. Manufacturers will will say otherwise claiming weaker FD springs or very slightly different chainring spacing.

Since you already have the crankset, may as well put it in and try it if you want to use it.

  • the thing is I removed it from my 10 speed bike and I am selling it ( changing everything to 11 speed) but I have someone who is interested in buying it and wants to know if its compatible with a 11 speed ultegra – Mega Biclas Sep 10 '16 at 16:02
  • If it worked with 11 speed, why wouldn't you have used it on the bike you just converted to 11 speed? – zenbike Sep 11 '16 at 3:06

Shimano says "No, it is not compatible". If you are using it personally, perhaps it would be worth trying, but it can't be sold as 11 speed compatible.

  • For what it's worth , almost all Shimano equipped bikes are running something Shimano says is incompatible. – Batman Sep 10 '16 at 16:15
  • 1
    Ummmm, no. That's just not true. Where'd you get your data? – zenbike Sep 10 '16 at 16:18
  • Anything that mixes non-Shimano parts? – Batman Sep 10 '16 at 17:59
  • @zenbike It's absolutely true. Look at spec lists for bikes. – Nathan Knutson Sep 11 '16 at 2:57
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    If, on the other hand, you said "The manufacturer says they don't work, but I've never had an issue", well that would be another story. – zenbike Sep 11 '16 at 12:05

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