How a Dual Rate Coil Over Works
Here is a diagram of how a dual rate coilover works.
Notice that the first or primary spring rate is a combination of the two springs working together.
The second or secondary spring rate kicks in when the floater engages the lock ring. This eliminates any movement on the part of the top spring and in effect uses only the lower spring.
What that means is that your secondary spring rate is your bottom spring.
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