Patent ID: 7281722

Claim:
A wheeled vehicle comprising a body frame, front and rear wheels, a front suspension unit coupled with the body frame to suspend the front wheel, the front suspension unit allowing the front wheel to move relative to the body frame, the front suspension unit having a pair of front suspension members coupled with each other, a rear suspension unit coupled with the body frame to suspend the rear wheel, the rear suspension unit allowing the rear wheel to move relative to the body frame, and a hydraulic system configured to inhibit change of a position of the body frame relative to the ground, the hydraulic system comprising a first hydraulic device configured to generate hydraulic pressure in response to the movement of the front wheel relative to the body frame, the first hydraulic device being built in one of the front suspension members, a second hydraulic device configured to generate hydraulic pressure in response to the movement of the rear wheel relative to the body frame, and a hydraulic pressure adjusting device arranged to connect the first and second hydraulic devices with each other, the hydraulic pressure adjusting device adjusting the hydraulic pressure of the second hydraulic device in response to the hydraulic pressure of the first hydraulic device, wherein a lower portion of said one of the front suspension members has an outlet through which the first hydraulic device communicates with the hydraulic pressure adjusting device.