Hagon Progressive Fork Springs (pair) are designed for improved handling and ridability. The progressive windings mean the front suspension is extremely compliant over smooth road surfaces but can easily cope with rough roads, mid corner bumps and other hazards.As the suspension becomes compressed the spring coils progressively short out making the spring rate progressively stiffer. A huge range is available for Sportsbikes, Superbikes, Trial Bikes and Road models covering the vast majority of bikes on the road.