The springs are one of the most important parts in the suspension system. They are responsible for maintaining weight of the car and damping vibrations when off-road driving. Progressive rate springs are the ultimate in spring design. The principle is simple. The spring rate increases when you need it (cornering, load carrying etc.) and decreases it when you don't. The science behind designing a progressive rate coil is knowing over what suspension travel and to what degree the spring rate will increase. Progressive springs will provide much better shock absorption and will make the car handle the unevenness of the terrain.
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