I recently acquired a tribike (Quintana Roo) frame. I know just how I want to build this up but I have some issues that I could use some help with. Principally, I need advise on the drivetrain. My limited knowledge tells me that mixing campy and shimano must be done carefully and, probably, it is best to stick with one or the other to make sure there are no compatibility problems. Is this right?If so I would probably stick with Shimano because of the availability of affordable parts.

One other question I have is how critical is it to match the speed# of the rear derailleur with the shifter gear#? Can these be mixed and matched, or do I need to pick a speed# for this bike and stick with this?

More to come, thanks.