Folding Bikes: They have smaller wheels so easier to store and park in your appartment, folded or not. To carry on boats, RV's, bus and more. Lower frame easy to step in and out.
5 speed: easy to use and perfect for the city and bike paths. There are enough ratios to gradually build speed without forcing too much. Not great for steep hills, ok for medium grade climbs. - Derailleur: Shimano Skylark