When to use coaster brake, and when to use rear rim brake?
The coaster brake is the primary brake. It should be used as your first means of stopping. Rim brakes on coaster brake bikes are typically a safety design. If the chain were to break or come off the sprocket you would have no coaster brakes. In the U.S. the hand brake is normally installed on the front wheel. The front wheel provides more braking power as you weight shifts forward.