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Meantime »
https://forums.nicoclub.com/meantime-u7126.html
Fri Jul 25, 2003 10:44 am
Linear rate springs = spring has 1 fixed rate across its entire coil. Progressive rate springs = spring has a "range" of rates across its length, usually a softer rate on the outer coils to soak up vibration and bumps, and then a stiffer rate on the inside coils for hard cornering/compression.
A linear front and progressive rear setup means that you will "feel" more from the steering when you turn in, the fronts will compress consistently no matter what the road surface is because they're only 1 fixed rate. Progressives tend to suddenly change rates if they compress rapidly which is not good if you're pushing the suspension to its limits. Having the rears progressive will help you from rattling your a$$ off in the meantime (linear springs tend to be more harsh), and since the rears are more involved with power application than steering in RWD there's less of a need to have a fixed rate spring back there.
This is all oversimplified, check out the Suspension FAQ and other related threads for more detailed info on the difference between the two.