| 摘要 |
To attain a well-balanced high-strength main frame and high strength in sections joining the main frame and head pipe. A vehicle frame structure extending from the head pipe rearwards to the pair of main frames on left and right in an overall sealed cross sectional structure, wherein at least a section of each main frame is comprised of a frame upper stage and a frame lower stage each made up of a sealed cross sectional structure, and an outer plate and an inner plate joined into an integrated piece with a frame upper stage and a frame lower stage installed to extend over both sides of the frame upper stage and the frame lower stage.
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