Dahon Speed D7 Features:
Tough commuter bike - includes rear rack and fenders
Fast-shifting Neos 7-speed derailleur
Folds down to the size of a suitcase in a few easy steps
Lightweight chromoly frame
The best part about the Speed D7 is the responsive Neos shifter. The seven gears have a wide range, and it is super easy to shift between them using a twist-grip shifter. It can handle practically any hill for the everyday commuter.
On 20" wheels, the Speed D7 is also faster than most folding bikes. With its lightweight frame, this bike beats most forms of public transportation. There is a rear rack included if you need to carry extra cargo, and the fenders protect your clothing from the dirt or water on the road.
What makes this different from the Mariner D7? The Speed D7 has an steel frame (rather than aluminum) which makes it 1.6lbs heavier. It also has some rust proofing and uses a different hinge setup. Both bikes are great but the Speed D7 is designed to be more affordable.