| 摘要 |
A tubular bicycle frame wherein the mid portion of the frame is elevated above the wheels it is mounted on and free from the conditions of being between them. Furthermore, the frame is designed to accommodate two lever machines that pivot from the rear portion of the frame and pull rearward separate drive sprockets located within the rear vertical tubes of the frame, while each drive sprocket rotates the rear wheel. The frame also has a tube structure configuration that prevents the frame from twisting due to great pulling forces working against the axle of the rear wheel. The frame also is able to accommodate electronic devices due to its wide tubular diameter.
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