Patent ID: 7073617

Claim:
A body frame for a motorcycle comprising: a head pipe unit which extends obliquely downward to a rear of a vehicle from a head pipe and so as to expand in a vertical direction; a down frame which is connected to a front part at a lower end of the head pipe unit to extend downward and further extends to the rear of the vehicle, the down frame being constituted by integrally forming left and right down frame sections and cross member sections which connect the left and right down frame sections to each other, with mold forming, and the left and right down frame sections having a sectional shape opening in a vertical direction; and rear arm brackets which are stretched and connected to a rear end of the down frame and a rear part at the lower end of the head pipe unit, wherein at least one of the head pipe unit, the down frame and the rear arm brackets is an aluminum die-cast molded product and the rest are aluminum forged molded products, or wherein all of the head pipe unit, the down frame and the rear arm brackets are aluminum forged molded products.