| 摘要 |
Between the crank bearing casing and a guide fork bearing tube (3) extends a diagonal tube (4), and between the saddle column tube and the steering form bearing tube extends an upper tube (1). From the saddle column tube and the area for the crank bearing casing (5) emerge two chain brace tubes (6). The upper tube is bent downwards towards the diagonal tube in a V-formation. A support tube (20) extends between the upper tube and the diagonal tube at a distance from the guide fork bearing tube. |
