Patent ID: 6979014

Claim:
A body frame structure for a vehicle comprising: a body frame having a front fork at a front portion of the body frame; a swing arm being mounted for an upward and downward swinging movement at a rear portion of said body frame; a head pipe on which said front fork is mounted for permitting a turning movement; a box-shaped box frame portion extending obliquely rearward and downward from said head pipe; a twin tube portion having twin tubes extending obliquely downward and rearward separately on the left and right, respectively from a rear end of said box frame portion, wherein a width of the twin tube portion is smaller than a width of said box frame portion; and a rear frame portion extending obliquely rearward and downward from rear ends of said twin tubes of the twin tube portion, wherein said rear frame portion has a width greater than the width of said twin tube portion and a thickness of said rear frame portion is smaller than a thickness of said twin tube portion in side view.