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Coil Springs 2

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One way to construct a progressive-rate coil spring is to wind the coil in a cone shape so the mean diameter varies over the coil length. This is often used on OEM coil spring applications where a live axle is used. Other progressive springs use varying spacing between the active coils. Some coils start to bottom as the spring is compressed, and the reduced number of active coils causes the spring rate to rise.