1. Frame design
All the frame models of COOLFLY company come from the sketch drawn by Zhou Guang De himself. The design emphasizes the principle of ergonomics, the accurate quantification of the design software, the research & development of the engineering mold, the adjustment and correction of the mold several times, and the strict control in the production process, so as to achieve the perfect combination of theory and practice, these jobs make riding is a pleasure, not a burden. Chief engineer Zhou said that if the frame design was unreasonable, and the cyclist will feel very tired soon, and the lumbar shoulder will feel uncomfortable if ride for a long time.