I own two 20" folders: (1) 7-speed Shimano, 6061 frame, 406mm rims, weighs 10 Kg $85 brand new; (2) Mexller BAHIS B3, 27-speed, 7005 aluminum frame, 451mm rims, 10.5Kg, very handsome bike, $265. Both bikes were purchased brand new in Taiwan. You need a luggage of 24" wide to transport the bike as a check-in luggage.

In some North American cities such as Toronto, bikes with 20" wheels are allowed on the sidewalk.