Putting ultegra on a bike with tiagra?

macondo01 Posts: 706
edited November 2009 in Road beginners
Last time I built a bike was a raleigh rudge and I put cow horns on so...

1)Have my caad9 cannondale with tiagra - can I put ultegra 6600 components on instead?

2)And would this be a good idea? I'd be swapping them from one bike to another. I say but I would pay someone to do it!

"Let not the sands of time get in your lunch"

National Lampoon