Campagnolo 11 speed crank with 10 speed running gear I currently have an older 10 speed Campagnolo Record group set with 52/39 cranks.  I would like to get a compact group set. I can't get an equivalent 10 speed compact cranks now but I can get an 11 speed set.  

Can I use 11 speed crankset with the remainder of my 10 speed group set?
No, Anonymous Donor is wrong, I am afraid - you will find that the chainrings on the 11s cranks are effectively closer together and you may well get issues with the chain touching the outer ring when you are on the inner ring and the smallest 2 or possibly even 3 sprockets (depends on the frame geometry). Sometimes this just causes noise and it's an irritation only, other times the lift pins on the inside of the outer ring will pick the bottom run of chain up &amp; you will get a chain-suck type effect that can do a lot of damage.

Front mech set up is also sightly more difficult although that can be persuaded to work - it won't work as well, though, as a full 10s system and you may get chainn-drop issues going from big to small ring, and "float" issues coming back up from small to big ring.

Compact is available in 10s, in the current range with Veloce and there are still quite a few vendors advertising Centaur 10s if you want a lighter, carbon chainset.