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If you know the wheel rate (WR) you want and the angle of the damper from vertical (A), required spring rate (SR) can be calculated as follows:
SR = WR / (cosine(A))^2
e.g. if A = 30 degrees and WR=100lb/in
SR = 100 / (COS(30))^2
therefore:
SR = 100 / (0.866025)^2
so:
SR = 100 / 0.75
which gives:
SR = 133.33lbs
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