Thread: Ultegra FC-6800 inner ring swap potential
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Old 06-11-16 | 08:48 PM
  #7  
GorpJunkie
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Originally Posted by HillRider
Yes, you are correct. The BCD is 110 mm for all configurations BUT it uses a 4-bolt asymmetric pattern, not the more common and older 5-bolt symmetric configuration. A compatible 39T chainring is going to have to come from Shimano.

Here is one source: Shimano Ultegra FC6800 11sp Double Chainrings | Chain Reaction Cycles
Yep... sorry I wasn't more clear with my intentions in my initial post, but yes... I was planning on attempting the swap with the compatible Shimano 39T for that very reason. Thank you for taking the time to point that... better safe than sorry.
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