Originally Posted by
Jellyjam
I see what you are saying but I was under the impression that I couldn't go 11 speed unless I changed my wheels. I'd like to be able to keep my original Campagnolo hubs and mavic wheels. If I can keep my wheel combo than the Chorus 11 speed from Ribble is a no brainer.
You need a new freehub for any increase in cogs - 9, 10, or 11. Campagnolo decreased the inner diameter of the splines so they could make it out of aluminum without the denting problem alloy Shimano splined hubs have, and made it 1mm wider.
With your Campagnolo brand hubs you can install one (I installed 9 speed Record Titanium freehubs on both my 1996 Chorus hubs) perhaps with an additional 1mm drive side spacer (the spares manual showed two for my eight speed hubs but they came with one; with just one the chain didn't clear the dropout in my small cog).
The 12mm axle sealed bearing reportedly works (the cup-and-cone freehub stub is 12mm) although I haven't confirmed that personally. The over-sized axle version will not.