you got it correct,
a progressive rate spring has the ability to be soft during normal use, then "progress" to a harder rate when the car is driven hard. so say if you have a spring that is progressive with rates from 3kg/mm to 5kg/mm, the during normal highay driving and around town etc, the car would feel as though it had a 3kg spring in it. when u drive it hard around corners etc, the spring would compress progressively harder, resulting in a stiffer feel.
a linear spring will always be whatever rate you buy it.
for a daily driven car, and with decent ride quality, i'd go with progressive WITHOUT A DOUBT, it soaks up the bumps and handles good for a squirt around the bends too. linear springs are more 'race' orientated.
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