Derath and NoRacer, thanks - great ride. We ended up hooking up with BBC - they were doing a ride from Marley Station Mall to Annapolis. Derath - we've had our son on an older TREK tandem (LARGE/SMALL) with a stoker kit since he turned 6 . He's might be tall enough to take the stoker kit off and use extenders but we'll probably wait until summers end to do that. He loves it. We usually ride about 30 - 40ish miles with him - he gets a bit cranky (as does his mother) beyond that.