Quote Originally Posted by ciocio View Post
The pictures aren't close enough to see, but if they are worn, should I not buy the bike? How much would a replacement cost?
That's a badly worn example in the picture. The teeth look kind of like shark fins, as opposed to...well, teeth. It's a used bike, so expect some wear. If they're significantly worn, though, I'd tread with caution. I'm not familiar with Campagnolo,but a new Veloce 10-spd cassette is, according to my LBS's online catalog, about $90. A new Veloce crankset would be about $300. (Prices are USD) You'd need a new chain too, but I can't find that. The LBS's website is being stupid.

Only you can determine if this is worth it. FWIW, though, the frame, especially if it's in good condition, may be worth upgrading if the components are not overly worn. Get what life you can out of them and then go about upgrading the drivetrain.