Join Date: Nov 2005
Bikes: Univega Via Montega, Nashbar Aluminum frame/105 roadbike
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Assuming the bike's in good shape, and needs nothing replaced I'd say yeah, it's probably worth that. A good once over would be important. Bearings (wheels, headset, cranks), chains, chainrings, cassette, should be checked out. These parts add up in price if they need to be replaced, especially any tandem specific items. Look over the frame carefully for any damage or possible rust issues.
As for sizing, 59 might be pushing a touch large for you (I'm assuming you'll captain), though it depends on your proportions. Extra long arms and torso will generally get you fitting on a slightly larger bike than if you're all leg.
That being said, having sufficient standover clearance is critical when captaining a tandem, you've got to be able to straddle the top tube comfortably and hold the bike stable when you come to stop.
For your stoker, 56 is definitely on the big side for someone 5'4", but the rear on tandems can have a much larger range of adjustability. With telescoping stoker stems, so long as you can get the seat height right for her, it may not be quite as critical that she have the same kind of standover clearance as on a single, as you'll be balancing the bike for starts/stops.
You know what? Looking at those sizing numbers, they seem strange. I can't find a list of the sizes the T100 came in, maybe someone can pipe in? Usually the stoker seat tube is a lot shorter than the captain's... I'd get the seller to measure the captain and stoker seat tubes, centre to centre.