Bicycle frame has supporting frame part made from extruded profiled, where extruded profile has multiple chambers, and frame part has openings of extruded chambers on its top side and on its bottom side

摘要

The bicycle frame has a supporting frame part (1) made from an extruded profiled. The extruded profile has multiple chambers (2a). The frame part has openings (2b,2c) of the extruded chambers on its top side and on its bottom side. The cut surfaces of the extruded profile form the upper and lower sides of the frame part. The extruded profile of the frame part has four chambers.