Manufacturing method and structure of carbon fiber rims

A manufacturing method of carbon fiber rims, comprising:

• forming a metal strip having a needed shape by heating a metal substrate to a moldable temperature;
• extruding the heated metal substrate to form a metal strip having two side walls, a connecting wall connecting opposite terminal surfaces of the side walls, and an inner rim wall connecting respective radial inner edges of the two side walls to form a space surrounded by the side walls, the connecting wall and the inner rim wall;
• connecting two terminal ends of the strip to form a circle and thereby define a rim frame's embryo;
• forming a plurality of through holes and a plurality of spoke coupling holes by milling the rim frame's embryo to form a rim frame, each spoke coupling hole being formed in the inner rim wall and at a portion of the inner rim wall disposed between an adjacent two through holes, and each spoke coupling element being disposed in each spoke coupling hole;
• performing a surface roughening treatment on the rim frame having the plurality of through holes and the plurality of spoke coupling holes thereon to increase roughness of a surface of the rim frame;
• trimming a carbon fiber cloth to a suitable shape and then covering the rim frame and the plurality of through holes with the trimmed carbon fiber cloth;
• heatsetting the rim frame covered by the trimmed carbon fiber cloth in a mold to form a carbon fiber layer on the rim frame and thus form a semi-finished carbon fiber rim;
• and
• treating a surface of the semi-finished carbon fiber rim to form a finished carbon fiber rim of a bicycle.