Hi, i'll warn you in advance, a bit of a noob question here.

Got a build planned and had 11speed in mind for it. I do some racing, and had got to thinking about what would happen if i punctured, and the neutral service vehicle behind me only had 10sp wheels in it. Would it even fit? And if it did, would i be in risking the other components?

I know normally if you puncture then your race is kind of done anyway, but thought it would be worthwhile checking for those rare situations when i might be in with a shout

Dont worry, you can get by on a shimano 10spd rear wheel in an emergency.

cog to cog for c11 is 3.8, cog to cog for shimano/sram 10 is 3.95

Good input already - I'll add by noting that the cog thickness of Campy 11 speed is the same as the cog thickness for Shimano 10 - so overall in an emergency you can get by - will have a gear or two that are sketchy - may even want to turn the down tube cable adjuster a little bit if you plan to use that gear much.

And you noted it well in your original post too that for most amateur races, getting a wheel out of a wheel vehicle generally means you are now out of contention and so through that wheel change now only have a chance to simply ride it in......there will be no long line of vehicles to move up through to catch back on. Then again if you're on a great day and the pack is just lumbering along - who knows what could happen!!!

Thanks guys, good to know about the shimano 10sp.

After your replies i went and checked the spacings, says campag 10sp is 4.12mm spacing and 1.7mm thickness. So i take it that wouldn't work at all?

Well, it would certainly work a lot worse. I've never read of anyone worrying about getting a Campy 10 wheel as a neutral support replacement.

The solution would be don't ride the Campy at races that only have Shimano support?

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Or even better, don't ride races that have any Shimano support. That way you'll be sure to be with people who appreciate quality.