| 摘要 |
PROBLEM TO BE SOLVED: To provide a bicycle frame capable of promptly adjusting itself to a model change, sufficiently reinforcing a joint part of a front frame and a hanger pipe by a reinforcing element, and downsizing the reinforcing element. SOLUTION: A stand pipe 11 and a lower pipe 12 are structured by a cylindrical front frame 22 made from one pipe member having a first inflection portion 23. The hanger pipe 16 is welded to the front frame 22, and the reinforcing element 31 reinforcing the joint part of the hanger pipe 16 and the front frame 22 is provided. The reinforcing element 31 bent along the first inflection portion 23 in a longitudinal direction of the front frame 22, and formed to have a U-shaped cross section. Both side end portions 31a of the reinforcing element 31 are welded to right and left both side end portions on an outer peripheral surface of the front frame 22, and a part between the fore-and-aft both end portions of the reinforcing element 31 is welded to an outer peripheral surface of the hanger pipe 16. COPYRIGHT: (C)2007,JPO&INPIT
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