A folding bike makes it easy to burn carbs and reduce carbon emissions on the slog to work.
Look for one that folds quickly and compactly, with wheels 16 inches or bigger for stability. The lightest models are generally made of titanium, but these often start at $1,500.
Dahon's aluminum bikes are more economical and plenty durable, says Paul Steely White of New York City advocacy group Transportation Alternatives.
The Mu SL nine-speeder folds in 15 seconds, has 20-inch wheels and weighs 19 pounds.