Are frame changes needed to switch groupset from Shimano to Campagnolo?
I don't think you will need to change the frame, I looked at one of the bianchi series a while back and I saw the same frame (the Oltre - I can but dream) offered at different prices depending on the groupset. But the groupsets available were from both shimano and campag. There's variations with Dura Ace, Ultegra, Athena, Super Record etc. I can't imagine the actual frame would be different between these groupsets, otherwise surely it would have a different name?

Here's the link to that page: http://www.bianchi.com/Uk/Bikes/Bikes_List.aspx?RangeIDMaster=74825&amp;CategoryIDMaster=74829

You may want to visit the Scott site, you may find something similar

However I can imagine you're going to have to change just about everything else, though, including wheels (well, as far as the freehub at least).