There is a Dahon 3 speed for sale locally, I'm either 2nd or 3rd in line for it so I figure it will be gone, so for now I'm just looking to get educated on these folders and on this one specifically. Seller says it is from the 80's, has something wrong with either the 3-speed shifter or the hub (I'm guessing just the shifter mechanism on the handlebars), and has a cracked rear fender. Apart from that it looks like it would be a fun project.

I'm not sure how well this one would hold up for me, just under 6' tall, weigh over 200Lbs, would probably use the bike as a commuter and local grocery getter, and as something to take on trips like if my wife wants to go to Chicago with her kids and we head down on the train (not all the trains have accomodation for full sized bikes).

Any issues on this bike in particular to watch out for? I've read a bit this morning about seat tube cracking, and hinges creaking/squeeking, anything else to know? Since I'll probably miss out on this one I'm just looking to get educated on them. If I do miss on this one then I'll be watching for another one to maybe get before next summer.

Oh, and before I forget, what size do you think the tires are on this one? They look much smaller than 20".

Thanks for any info.
The pic was posted by the seller.