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I have not tried either Progressive or Works shocks in a long time. When the shorter spring bottoms out on the crossover spacer, then the over all spring rate transitions from the initial to final rate. That point is controlled by the crossover spacer in the shorter spring. The transition point is where the over all spring rate transitions from the soft initial rate to the harder final rate. Increasing the preload increases the force on both springs. The transition point can be adjusted by varying the preload on the top spring with spacers. In the "7 Pages of Suspension" are details how the same Works Dual Rate fork springs, but with different crossover points, can work for 260 lb aggressive rider (me) on a Roadster, and an 140 lb not so aggressive rider on an Nightster (Sportytrace). In theory, having the ability to adjust the crossover point of the dual rate springs provides the rider with the ability to set the spring rate crossover point where ever he feels best, so it is far more versatile. Works has more spring offerings, and do custom settings of damping. Progressive does not offer custom springs and damping changes beyond the basic set ups. If you get too far on either end of being too light or too heavy, the spring will not work for you. Progressive Suspension offers a standard spring rate for 180 lb riders and heavy duty spring for 260 lb riders. I have tried both shocks, but keep in mind that was back in 2006/2007 so I don't know what has changed since then.
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