Are OME coils progressive?

Not by definition. Of course spring rate is not linear anyway so as the spring compresses it takes increasingly more force to continue the compression.

22RToy said:

As long as the additional force required is directly proportional to the deflection, that is linear. F=kx. Spring rate k is constant.

In a progressive spring, the rate is a function of the deflection, say F=(k+.1x)x. As the deflection increases, the spring rate increases.

Of course, this is all in theory.

Click to expand...

You are correct on the constant
Highlighted is where reality of suspension geometry trumps theory. The spring rate is constant, but the force required goes up due to dynamic angles. Static angles would be ideal in theory but difficult to design and build.

I am bored today at work.