An improved, lightweight suspension fork for a bicycle with variable travel capability that maintains excellent torsional rigidity. This suspension fork allows for adjustable suspension travel adjusted at the handlebars of the bicycle. The suspension system includes a travel adjustment knob located at the handlebars of the bicycle. The travel adjustment knob is keyed with the main shaft of the suspension system so as to allow turning of the main shaft. Located on the main shaft within the suspension system housing is a length adjuster mechanism. The length adjuster moves linearly with respect to the housing as the main shaft is turned pulling the inner tube member of the suspension housing up or down relative to the outer tube section of the suspension housing, thereby changing the stroke of the suspension system.