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The spring rate the tire actually feels depends on where the shock mounts and its angle. Compare two setups side by side. Example values shown.
Measure along the lower arm from the inner hinge pin. Shock angle is viewed from the front, 0° = straight up.
| Setup A | Setup B |
|---|
Wheel rate = spring rate × (motion ratio)². Motion ratio = (mount distance ÷ wheel distance) × cos(angle). Sag assumes the corner weight is all sprung weight, so it reads a bit high.
