Largest possible cog on rear?

[def]

What's the largest cog you can get on the rear for 10sp camapagnolo?

I have a friend running Xenon 10sp and is planning a trip to Adelaide for the TdU. With the hills riding she'd like to know how big she can go on the rear. Currently 25 tooth.

I've seen a 13 to 29 available. Will that work with standard derailleur?

[Pete.]

Yes 29 will fit, unless you have a really short derailleur hanger on the frame.

[AndrewBurns]

Yep, I run a 13-29 with a compact crank, no hill too big.