Vehicle body frame for motorcycle

摘要

In a body frame for a motorcycle mounted with an engine unit 11 and provided with a main frame 2a by which a front fork 4 and rear arms 7 are supported, the main frame 2a includes: a head pipe unit 20 which extends obliquely downward to a rear of a vehicle from a head pipe 3 and so as to expand in a vertical direction; a down frame 21 which is connected to a front part at lower end of the head pipe unit 20; and left and right rear arm brackets 10 which are stretched and connected to a rear end of the down frame 21 and a rear part at lower end of the head pipe unit 20, and the head pipe unit 20 is an aluminum die-cast molded product, and the down frame 21 and the left and right rear arm brackets 10 are aluminum forged molded products.