Dahon Mariner D7 Folding Bike, Brushed # It folds in less than 15 seconds so you can take it anywhere and Its light enough to carry on public transport. Perfect for taking on a bus or train on your commute or stashing in your apartment. Equipped with a Dahon Neos rear derailleur that features crisp, fast shifting and a low profile design that is protected from damage. 7005 aluminum frame with custom-drawn Sonus tubing and six patented technologies.