Originally Posted by
chandltp
Yea, that's the problem I'm having. I can't seem to find geometry information on sub-$1000 bikes. I was told by a LBS that all the lower end tandems are a one size fits most. Although tandems seem to be such a niche market that getting good information out of the bike shop is difficult.
So, looking at the Amazon listing more closely, I note that a) they indicate a 20" standover in the rear; b) it appears to have 26" wheels; c) at least one view of the bike is pretty much flat-on, and d) you can zoom in to the point that you can see the seatpost collar is about an inch above the top of the rear tire. With a ruler you should be able to measure the distance to the lowest point that the top of the saddle could be down to the crank centre, and from that figure out whether your son will fit with the saddle all the way down. Between the theoretical standover and the estimated 26" wheel diameter (tires included), you should have a good enough scale to go from.