Ans: The wheel size is only part of the equation. The relevant metric is the number of gear-inches the bike can attain. The gear-inch measurement essentially shows how many inches forward the bike will travel per revolution of the crank arm, or how far you travel each time your foot goes around once. We use a large crank wheel, in combination with the smaller wheel, to provide the same gear range that you will find on a large-wheeled bike.
Ans: Give yourself a few minutes to get used to the smaller wheels. Smaller-wheeled bikes are more responsive that larger-wheeled bikes can be, so they are much better for riding on crowded streets or among pedestrians.
Ans: Generally, it takes between 10 and 15 seconds to fold or unfold a bike. With practice, 8 seconds is common.