1. Bike size. The Folding Bike is an overall smaller size bike, recommended for riders between 5'2" and 6'2".The City Bike is a standard size bike with a curved shape frame. Because it is bigger, it is recommended for riders  between 5'4" and 6'4".
  2. The Folding Bike has the folding feature. The dimensions at the folding stance are 40" X 22" X 28".
  3.  Fat Size: The folding bike equips fat tires which can be on various road conditions, while the City Bike is designed mainly for city trails or light off road.

We intentionally make major parts including the battery, controller, display and other parts interchangable with each other. They are both great bikes and you will enjoy riding them!