Originally Posted by 13ollocks

“10 speed” refers only to the number of sprockets on the cassette - 10 in your case (look at the picture and count them). The number of chainrings on the front doesn’t change the number of “speeds”- just the number of gear combinations you can access - not the same thing. What is the “speed” designation of the rest of your drivetrain? The shifters and rear derailleur? For them all to work properly together, the cassette, RD and shifters have to be the same Campagnolo “speed” designation. If you have Campag 10sp shifters and RD, you’re all set. If you have Campag 8sp shifters and RD, you’ll need to swap the current cassette for a Campag 8sp cassette. If you have Shimano or other brand components, it gets more complex, but you can still make it work if you get some expert input (trying to figure this out online is likely to end in frustration for all concerned). You need to find someone who can look at what you have and tell you what you need to do to make it all work.