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In a straight axle car with the rear springs mounted on the trailing arms, there is a motion ratio involved. To find the spring rate that the car will feel, you multiply the motion ratio squared times the installed spring rate. The MR is B divided by C. As in the front coilover sketch explanation, if there is a spring angle relative to the swing arm, then you would square the Cos of that angle (difference from 90 degrees off the arm) times the MR times the installed spring rate to find the true spring rate that the car feels. View Related Article
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