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Motion ratio shouldn't apply to a TB-based wheel rate calculation. You're basically including a motion ratio-esque factor by measuring the distance to the wheel contact patch and including that in your equation as the length of your lever arm. This takes the TB "spring rate" calculated with no lever arm length and reduces it a certain amount based on the distance from the centerline of the TB to the wheel contact patch.
The motion ratio applies when you have a coil spring mounted at a point on the LCA that is closer to the body then the wheel. Thus the spring compresses less then 1 inch per inch of wheel movement.
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James
1984 GTV6
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