Back-type bicycle frame: The metal hook is connected with the sheet metal gap of the rear tailgate, which generally does not affect the opening of the rear tailgate. The advantage is that compared with the overhead bicycle frame, it is more convenient to take and place the bicycle. The disadvantage is that the metal hook that plays a fixed role will more or less affect the body sheet metal. Sometimes the bicycle hanging in the air may block the vehicle number plate. There are many kinds of products of this kind, No brand has the most obvious advantages.