| 摘要 |
The present invention relates to a vehicle body frame, in particular for motorcycles, having joined frame pieces (5a,5b), wherein reinforcement portions (5g) are formed on side surfaces of the frame pieces (5a,5b) to extend longitudinally of a vehicle, and either of lower portions and upper portions of the frame pieces (5v), which border on the reinforcement portions (5g), are expanded outward relative to the other in a vehicle width direction.
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