Progressive Spring Kit F800S/ST - Direct Replacement (Front and Rear)

In a perfect world the suspension of your motorcycle would react differently every time. The top half of the spring would be supple and would react flexibly to absorb small bumps and irregularities instantly. As the spring compresses, it becomes more rigid so even large bumps and holes in a road surface will not cause the suspension to bottom out.

For cost-efficiency reasons, new motorcycles are equipped with linear springs. Compressing the top half of this type of spring takes just as much force as compressing the bottom half. The result is that the top of the spring is in fact too rigid and the bottom too supple.

Fortunately, this perfect world does exist. Hyperpro produces progressive springs whereby the top half is easily compressible and compression of the bottom half is much harder. This results in a perfect set-up for every situation. A number of benefits are mentioned below:

Improved braking distance
Whenever you apply the brakes, the pressure on the front wheel increases. Regular springs cause the bike to 'dive' causing the brakes to become less effective. With progressive Hyperpro springs the bike takes less of a dive, the rate of resistance increases which results in an improved braking distance. Not only is this faster on the racetrack, it is also safer on the public highway!

Improved motoring performance
Small bumps and irregularities in the road surface get absorbed immediately, large bumps or holes are intercepted by the 'more rigid' part of the spring. This results in perfect harmony between control and comfort.

No resonance
A linear spring has a specific frequency and therefore, could resonate at that particular frequency. Resonance is not only very annoying it can also be dangerous. Progressive springs do not have a frequency so therefore never resonate; an obvious difference!

Always a perfect setup
Progressive springs always adjust themselves instantly to changing circumstances. If you carry a passenger on your motorcycle, the spring should provide more resistance and this is certainly the case with progressive springs. Hyperpro progressive springs even respond to the amount of fuel left in your tank.

We believe in our product and therefore offer a lifetime warranty against breakage. Tests have proved that even after driving a million kilometres our progressive springs maintain the same characteristics.