Linford
Guest
+1 on the front.
Can't help but wonder what gearing could possibly suit both halves of the partnership. Perhaps a nice sensible triple up front, combined with an 11-11-11-11-11-11-11-11-11-12-13 cassette on the back (13 is the bailout gear on Jens Voigt's tandem).
And as for the bike....
Forgive me for saying this but the nose to arse proximity between the riders would make the one on the back desperate to avoid any hills and stomping on any tall gears - and sharing curry's the night before.