This model is designed to ride on paved roads. It can be used for basic transportation and hauling. The frame is designed for the rider to sit upright for comfort. The lowest model has no gears, but it is very easy to maintain. In hilly terrain or for longer commutes, the higher end bike in this category will provide an easier ride because of their lighter weight and gears. Tires on these bikes have a larger radius. These bikes are designed for rougher terrain. Because of their heavy duty frames, suspension systems, and thicker tires: they are designed for unpaved roads and steep inclines. The higher end bike in this category can be used on rocky, step hill sides. These light weight, narrow tire bikes are designed for speed. Although, they may be ridden for some distance, they are not designed for comfort. These models are suitable for very good roads.
Cruiser/Transportation Model

http://www.mbautos.com/accessories.html
Mountain Bike Model

http://www.spicercycles.com
Racing Bike Model

http://www.spicercycles.com