One myth that should be dispelled is that smaller wheels necessarily mean a slower riding experience. Smaller wheels have more rolling resistance. However, because they are on the whole lighter and have less air resistance than larger wheels, they can be just as speedy.
The key to preventing a small diameter wheel from slowing you down because of rolling resistance is to make sure the tires are properly inflated. Smaller wheels will feel a little rougher than full-sized wheels. Most designers get around this by either including some kind of suspension or dampening into the frame design or by specifying larger balloon tires. Smaller diameter tires are also more likely to get stuck in large potholes, so extra care should be taken when riding on uneven terrain.
The advantage of a folding bicycle is that it can be condensed into a small package and stowed away while still offering all of the convenience and independence of a regular-sized bike. It’s a smaller ride that can easily integrate into your everyday life and augment your mobility.
For a great historical summary of the folding bicycle check out: foldingcyclist.com/folding-bike-history.html