In order to stay compact and lightweight, most folding bikes have just a single chainring, limiting their hillclimbing capabilities. The Easy Ride is made to address that issue, by incorporating two shiftable gears into a custom single-ring crankset.
I was wondering how that would work but it actually sounds really cool. My only concern for me specifically would be that I back pedal to horizontal position get ground clearance when going over things that the pedals could catch on.