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i'll give. i was thinking overall spring length and not travel. quick math:
4" spring. has to travel 2" to bypass at 50 psi (made-up numbers).
so 2" at 50 psi = 25 psi / inch spring.
shim say 0.1" . that is equivalent to 2.5 psi
so, 2.5 psi to get spring moving, followed by 25 psi / inch spring rate.
has to move 2" = 50 psi.
will now bypass at 52.5 psi.
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