Race Spring Rate, Wheel Rate & Ride Frequency Calculator
Calculate wheel rate, ride frequency, and target spring rate from spring stiffness, motion ratio, and sprung corner weight.
Calculator inputs
Enter your race-car data, then select Calculate.
How to calculate race spring rate, wheel rate & ride frequency
The Race Spring Rate, Wheel Rate & Ride Frequency Calculator works directly from your race-car measurements to produce a full setup breakdown — calculate wheel rate, ride frequency, and target spring rate from spring stiffness, motion ratio, and sprung corner weight.
How the calculation works
Wheel rate equals spring rate × motion ratio², so a small motion-ratio change has a squared effect at the tire. Ride frequency is calculated from wheel rate and sprung corner weight. When a target frequency is entered, the calculator reverses the same relationship to estimate the required spring rate.
Example
A 600 lb/in front spring with a 0.85 motion ratio produces a 433.5 lb/in wheel rate. At 700 lb sprung corner weight, calculated front ride frequency is 2.46 Hz; a 2.20 Hz target would call for about 479.5 lb/in at the spring. At the rear, 700 lb/in, 0.90 motion ratio, and 750 lb corner weight yield 567.0 lb/in and 2.72 Hz; a 2.40 Hz target corresponds to roughly 545.3 lb/in.
Frequently asked questions
Is this calculator specific to one racing series or rule set?
No — it performs the underlying physics/geometry calculation, which applies broadly. Always check your specific series' technical rules for any mandated minimums, maximums, or measurement procedures.
Race Spring Rate, Wheel Rate & Ride Frequency Calculator
Wheel rate equals spring rate × motion ratio², so a small motion-ratio change has a squared effect at the tire. Ride frequency is calculated from wheel rate and sprung corner weight. When a target frequency is entered, the calculator reverses the same relationship to estimate the required spring rate.
Let's understand your race spring rate, wheel rate & ride frequency result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Race Spring Rate, Wheel Rate & Ride Frequency
- Record the conditions (fuel load, tire pressure, ride height) each time you take these measurements, since setup values are only comparable under matching conditions.
- Re-run this calculator after any suspension, ballast, or fuel change to see how the setup shifted.
Common Race Spring Rate, Wheel Rate & Ride Frequency Mistakes to Avoid
- Treating a single measurement as the full picture — cross-reference this result with how the car actually behaves on track.
- Comparing results taken under different conditions (different fuel loads, tire temperatures, or track surfaces) as if they were directly comparable.
When to Use This Calculator
The Race Spring Rate, Wheel Rate & Ride Frequency Calculator works directly from your race-car measurements to produce a full setup breakdown — calculate wheel rate, ride frequency, and target spring rate from spring stiffness, motion ratio, and sprung corner weight.