Patent ID: 8172014

Claim:
A vehicle comprising: steering means for operation by a user; one or more rear ground-engaging wheels; a first front ground-engaging wheel located substantially in the centre at substantially the front of the vehicle and being steerable in response to operation of the steering means; second and third front ground-engaging wheels located either side of the first front ground-engaging wheel; and adjustment means for adjusting the steer angle and the height of the second and third front ground-engaging wheels depending on the steer angle of the first front ground-engaging wheel, the adjustment means being configured such that: when the first front ground-engaging wheel has a straight-ahead steer angle, the steer angles of the second and third front ground-engaging wheels are also straight-ahead and the height of the second and third front ground-engaging wheel is independent of the first front ground-engaging wheel to allow the first front ground-engaging wheel to remain in contact with the ground; and when the steer angle of the first front ground-engaging wheel is turned such that motion of the vehicle would describe a curve, the steer angle of the front ground-engaging wheel on the outside of said curve is turned at least partly towards the steer angle of the first front ground-engaging wheel, the steer angle of the front ground-engaging wheel on the inside of said curve is not substantially turned towards the steer angle of the first front ground-engaging wheel, and the height of the front ground-engaging wheel on the inside of said curve is raised relative to the height of the front ground-engaging wheel on the outside of said curve, the first front ground-engaging wheel and the front ground-engaging wheel on the outside of said curve remaining in contact with the ground.