Originally Posted by
thirdgenbird
the campagnolo freehub body was also widened when they switched to 9spd. campagnolo 11spd cogs are the same 1.6mm as shimano 10spd sprockets. i think this is one of the reasons shimano has been slow to go to 11spd. they will either need to go thinner than campagnolo in order to keep there current hub or switch to a wider freehub. switching to a wider freehub would either mean more dish or a wider hubs. neither option will be pleasant for people wanting backwards compatibility.
it would be best for everyone if shimano licensed the campagnolo freehub if they switch to 11. this would give shimano 11spd owner instant access to existing wheels, many good wheels can be converted over to campy use, and as a side benefit we would be one step closer to a wheel/sprocket standard. it would be great if they shared sprocket spacing but im not counting on it.
Unfortunately, I don't see this happening. The last time Shimano made a tentative step towards a better spline pattern, on DA wheels, customers flipped out when they found out they couldn't run Ultegra cassettes on them. At some point, they have to do something to fix the problems, but it won't be a smooth trip to get there.