Originally Posted by
Arasteh
I think it's all campy and it's a freewheel.
Campagnolo never made a 8-speed freewheel. Hopefully you have a cassette system.
If you have a standard Campagnolo short-cage rear derailleur, it will accept a 28 tooth rear cog, if you size your chain carefully.
Adding a 28 tooth cog to your existing cassette should cost less than $20 and take 15 minutes.
Realizing the same gearing with a compact crankset will cost around $250 and take an hour of shop time.
A totally unnecessary 'upgrade' to 10 or 11 speeds or whatever will consume at least $500 in new parts and 2 hours of shop time. If they are good...
Your choice...