djnzlab1

HI,
I ve noticed there's more than one size link on many of the Campy web pages for ordering chains, is this a newer model, most of the components on my 2 y/o bike are centurian?
I ve also noticed that most web pages reccomend chorus for chain replacements.

operator

If you're referring to the length of chain you'll usually want the longest ones you can get - for example a 103 link chain will be barely not long enough on a 50/34 and a 12-25'ish. On a medium sized bike.

Use whatever chain you want. Chorus isn't more or less recommended than record or veloce...

fietsbob

They're all, 1/2" pitch, its the width that changes as the stack of cogs gets more numerous and thinner
the space is between each.

canopus 

All Campy 10 speed chains are the same size. And you can use just about any chain that has width of 5.9mm. I use Veloce myself but I don't race. There are so few differences between the chains they consolidated the lines for the most part and you have either a Veloce chain or a Record chain (not to say there aren't other lines in the chains just that you don't see them anymore). The Record is lighter but doesn't last quite as long a Veloce (of course that just might be because of the different usage).

shelbyfv

I think the original Campy 10 speed chains were wider, 6.0mm or 6.2mm?? and then they changed to the Shimano standard 5.9mm. Having said this, I'll admit to knowing virtually nothing about Campy.