| 摘要 |
A body frame for a motorcycle includes a seat rail formed from a circular pipe that extends horizontally rearward from an upper rear end of a main frame. A backstay formed from a square pipe extends obliquely upward and rearward from a lower rear end of the main frame. A bent part formed at a rear end of the backstay faces the seat rail in the longitudinal direction. Projecting parts are formed on both sides of a concave groove formed in an upper surface of the backstay. The projecting parts are offset in the width direction with respect to a center line of the seat rail and the backstay to allow the seat rail and the backstay to be easily welded.
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