| 摘要 |
A bicycle frame that includes a mainframe portion is disclosed. The mainframe portion includes a first tube, a second tube, and a third tube arranged to define a space therebetween. In one embodiment, the first tube is a top tube, the second tube is a down tube, and the third tube is a vertical tube. The tubes reside generally along a single plane. Each tube has a cross-section perpendicular to the plane. The cross-section of each of the tubes has a first dimension being parallel to the plane, and a second dimension being perpendicular to the plane. At least one of the tubes has a ratio of the second to first dimensions of 1.35 to 3.0.
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