Bicycle frame

Abstract

This article is a bicycle frame, consisting of a main tube, a seat tube, a pair of seat stays, and a pair of chain stays. The bicycle frame according to this article further comprises an auxiliary pipe and a lower pipe. The auxiliary pipe, lower pipe, and seat tube form an inverted trapezoidal space. The main tube extends toward the bottom bracket shell, but is not connected to the bottom bracket shell and is cut off midway. The auxiliary pipe extends horizontally from about the middle of the seat tube, and its end closes the end hole of the main tube. The lower pipe extends from the bottom bracket shell in a gentle inverted L-shape when viewed from the front, and its end closes the end hole of the auxiliary pipe, while its own end hole is closed at the end of the main tube.

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