Abstract: A front fork for suspending a front wheel of a motorcycle has an outer tube and an inner tube slidably accomodated therein. A pressure chamber is defined between the inner tube and a hollow rod and communicates with a lower chamber formed in the outer tube through a port formed in the inner tube, an anular recess formed in the inner tube, another port formed in the inner tube at the lower portion thereof and a selected one of a plurality of orifices of different diameters formed in a lock piston located in the inner tube. The lock piston is provided with an engaging member engageable with a bottom wall of the outer tube when the inner tube is caused to intrude into the outer tube by a maximum amount.

Abstract: A suspension for two-wheeled vehicles is provided which may arbitrarily adjust its spring characteristics almost without changing the initial load applied to the suspension spring so that the optimum spring characteristics may be selected depending upon the desired riding quality or road conditions. A pair of series-disposed helical or coil springs are fitted over a telescopic shock absorber and are spaced apart from each other by a spacer whose position with respect to the shock absorber is adjustable and which is retained in position by a stopper securely fitted over the shock absorber. The pair of helical springs have different forces, that is the load causing the maximum deflection of one helical spring is different from that causing the maximum deflection of the other helical spring.