[Sportsandrec] Side by side tandem bikes, anyone familiar with them?

[pajohns1 at vt.edu]

List,

        Is anyone familiar with side by side tandem bikes?  In particular do 
both people have to pedal at the same speed and second is the seating 
adjustable so that two people of vastly different heights, 14 inches to be 
exact cand they pedal comfortablely?  Also, who all makes them?

Thanks,

Patrick
@Virginia Tech