Use the Motion Ratio calculator to estimate motion ratio from spring travel, wheel travel. Motorsport Math shows the formula and updates the result instantly.
Ideal theoretical result. Validate against manufacturer data, component limits and your race-series regulations before safety-critical use.
The Motion Ratio Calculator converts spring travel and wheel travel into motion ratio. It is designed for quick motorsport planning when you need the calculation visible, repeatable, and easy to adjust rather than hidden inside a spreadsheet cell. Chassis calculations help with springs, motion ratios, ride frequency, roll stiffness, corner weights, and load-transfer estimates.
For example, with spring travel set to 40 mm and wheel travel set to 50 mm, the calculator returns 0.8 spring/wheel for motion ratio. Change one input at a time if you want to understand which value is driving the result.
Motion ratio is shown in spring/wheel. Use the number as a calculated reference point, then compare it with measured data from the car, the part supplier, or the race environment. A mathematically clean answer can still be unsuitable if the inputs are estimated, rounded, measured under different conditions, or outside the normal range for the vehicle.
It is used to estimate motion ratio from spring travel and wheel travel. The page is most useful when you want a fast result, visible assumptions, and a repeatable way to compare motorsport setup options.
The arithmetic follows the formula shown on the page, but the practical accuracy depends on the inputs. Measurements, environmental conditions, component tolerances, and race regulations can all affect whether the result is suitable for real use.
Use it as an engineering reference, not as the final authority. Safety-critical decisions should be checked against manufacturer data, professional engineering judgement, inspection, testing, and the rules for the series or event.