Hyperpro, Progressive front springkit,
for XL 883 Sportster custom model year 01- up
comes with front fork oil
In a perfect world the suspension of your motorbike 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 motorbikes 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. Learn al about the benefits here!