Do not shelter from car number plate's trailer bar formula bicycle frame

The utility model discloses a do not shelter from car number plate's trailer bar formula bicycle frame, insert mouth and undersetting I -shaped thick stick including aluminum alloy base, american trailer bar square -mouth, aluminum alloy base one side is equipped with american trailer bar square -mouth and inserts the mouth, american trailer bar square -mouth inserts a mouthful one side and is equipped with the fixed bolt hole, aluminum alloy base one side is equipped with the undersetting slot, aluminum alloy base one side is equipped with undersetting fixed bolt, , aluminum alloy base one side is equipped with undersetting I -shaped thick stick. The utility model discloses a whole bicycle frame of adjustment that the I -shaped thick stick can be free is extended on the undersetting I -shaped thick stick that is equipped with and upper portion height is used for adapting to the not motorcycle type installation of equidimension, and the fixed bicycle that can stabilize through the backwheel seat stopper that