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He can get one of these:
http://www.ebay.co.uk/itm/AMBROSIO-11-SPEED-ROAD-RACING-BIKE-CASSETTE-SHIMANO-AND-OR-CAMPAGNOLO-COMPATIBLE-/391412360015?_trksid=p2385738.m2548.l4275
It's an 11 speed cassette that fits on a Shimano freehub but has the option of having sprocket spacing for Campag.11 speed shimano and campag are interchangeable regarding the chain working, but not on the kind of freehub they fit. Shimano needs an 11 speed freehub, Campag should work on any Campag one from 8 speed up.
Sumo
10/11 speed compatibility question...
I have a FFWD disc wheel from c.2010 that I am looking to sell. I have a potential buyer, but he runs 11sp campagnolo on his bike and has asked about compatibility. I have asked FFWD and the disc is built around a 10speed ultegra hub and since it was built before the introduction of 11sp drivetrains, it is apparently not possible to upgrade the freehub body to anything 11speed compatible. My question is whether there is any way around this problem?
In this article (http://www.velonews.com/2013/09/bikes-and-tech/drivetrain-compatibility-hidden-in-plain-sight_303199), Leonard Zinn suggests that SRAM Shimano and Campag 11sp cassetts are interchangeable and that if I could swap the free hub body to Campagnolo then all my problems would be solved... however obviously Shimano don't make a campag freehub body for <2010 ultegra cassetts...
However... in this thread on TTF (http://www.timetriallingforum.co.uk/index.php?/topic/117812-ultegra-11-speed-cassette-to-suit-10-speed-wheels/) some chap is selling Shimano 11sp cassettes that fit 10sp free hubs because he has shaved some of the metal off the back of the cassette.
If all 11sp cassettes are interchangeable, and if this chap can make 11 sp Shimano cassettes fit on a 10sp Shimano free hub, then does this mean that my buyer can run campy 11sp on my old FFWD disc???
My main worry would be the derailleur fouling the disc in the easiest gear?