I did have a KHS andem that was designed with the cropmo main frame and the rest hi tensil steel. Prolly not anything to worry about. I know the tandem ran very well.
Only thing that would concern me is that hi tensil steel is (from what I've heard) a bit more likely to break as it's more (can't think of the correct term as it's late) 'brittle' than cromo (?). I know the dept store bikes (Huffy) are made of hi tensil steel. But like I said, the tandem we had was actually a good ride.
If you don't plan on racing, might not be too big an issue. But then again, I thought that of my Lemond, and look at it!
