Technically speaking...all springs have "progressive" rates. Progressive springs have rates that are not static (Constantly change.) Linear Springs have rates that are static (set values.)
Progressive = Less predictable, will handle differently in 2 different situations, mainly suitable for street application. Can respond very sensitively to small bumps, but can respond aggressively when pushed. (all depends on how much the springs are compressed.) Unpredictable body roll due to different spring rates at different areas....ex= Cornering: one side compresses into a stiffer spring rate, other side stays at the softer one, car tends to bounce up back to the softer rate.
Linear = Predictable, uniform handling in all situations, suitable for all applications. (Daily driving, tracking, etc. Responds to all bumps in the same way due to the coils being equally spaced. Predictable body roll, requires less counter steering....ex= Cornering: both sides of the car compress equally at the same spring rate; smoother cornering.
Preliminary Result: Progressive may be more comfortable for daily driving, but as soon as you start to hit bumps ends up becoming bouncy due to the increased spring rates forcing the springs to compress/decompress to equal heights. Linear results in good overrall usage, with smooth returns to equal heights...plus allow your shocks to work more efficiently because shocks are linear.
Some info found while researching: Eibach kits are designed with Linear front springs, and progressive rear springs. (Cause of bounce in the rear with eibachs.)
From pictures alone....Ark springs are also set up as linear front springs and progressive rear springs, spacing in the rear allows for more travel room between coils, resulting in less bounce and harder handling due to higher spring rates.(Eibachs are closely spaced resulting in coils bunching up more and less travel room between coils.)
Conclusion: Eibach and Ark springs are both linear fronts with progressive rears. Eibach will have a stiffer and bouncier ride on rougher roads, Ark will have a harder ride on rougher roads due to a higher spring rate, but smoother in the sense that you get more travel room between coils.
Sorry for the long post, just read a ton about springs when I was making my decisions...and thought it would be best if I shared. In the end it's whatever brand you choose, they're technically the same types. Just they handle a little bit differently than each other
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