Folders for less than $500
http://www.downtube.com/Full_Suspens...ding_Bike.html $499, 27 pounds
http://www.downtube.com/product541.html $299, 24 pounds.
Check out Dahon http://www.dahon.com/folding-bicycles Many bikes under your price range, some with coaster brakes.
The Giant Expressway is $40 over your budget: http://www.giant-bicycles.com/en-us/...11/6964/43126/
The KHS "Latte" is super cheap $219, but super heavy at 31 pounds. http://www.khsbicycles.com/10_latte_06.htm
The KHS "Mocha" costs twice as much -but still under $500, and probably isn't any lighter (but it has multiple gears) http://www.khsbicycles.com/09_mocha_11.htm
There are many out there (Brompton, Bike Friday, et cetera) that will be lighter and will cost more than your $500 budget. But at least this little list will give you an idea what is out there and what you might find easier to carry up the stairs.
Last edited by KnottedYet; 07-03-2011 at 08:01 PM.
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