spring rates anyone?

You and me both. It's kinda dumb that some manufacturers closely guard their spring rates for their products. I want to know what the spring rate is for the springs I'm going to be putting on my car.
 
They are progressive. 99% of the time when you see coil springs which aren't evenly spaced that are progressive. I say 99% of the time because once Saab was using progressive springs where the coils were even, but the diameter of the wire changed from top to bottom to give the progressive rate.

As I said before very few lowering springs are linear rate.
 
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