Beth<br>
Other than maybe an aftermarket chain, nothing else can be interchanged as far as I know. I have chorus now and converted it from road bike to tri and I do like it, but not as much as I liked shimano. Just something about my old Ultegra/Dura ace mix. It was so reliable and consistent. I have had to adjust my campy more often, but it seems a crisper, faster shift when I have the campy dialed in, but thats not fair the shimano has over 9,000 miles on them.<br><br>
Hope it helps<br>
Just try them both, its a big decison