One size does not fit all... but is a much better solution for street riding vs. closed course (track) use. Single rate springs are ideal for a perfectly smooth race track and can be better matched to a specific rider's weight. However, on public roads which vary from silky smooth to near lunar surface-like with pot holes, speed bumps, cracks, uneven pavement and such, progressively-wound (or "rising rate" if you prefer) springs are a better solution.
On the street, when a bike hits a bump at speed, single rate spring are more prone to bottom-out resulting in a hard jolt and possible instability. The same bike & bump using progressively-wound springs will not have the same sever jolt and will not bottom-out nearly as quickly as the single rate springs.
Most sport bike suspension specialists are so myoptically focused on race track prep and (understandably) they sell what they understand. The street is a much different beast and should be properly outfitted accordingly.
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