Race Spring Rate, Wheel Rate & Ride Frequency Calculator

Auto Racing

Calculator inputs

Enter your race-car data, then select Calculate.

Front spring rate (lb/in)Front motion ratio (spring travel ÷ wheel travel)Front sprung corner weight (lb)Rear spring rate (lb/in)Rear motion ratio (spring travel ÷ wheel travel)Rear sprung corner weight (lb)Target front ride frequency (Hz, optional)Target rear ride frequency (Hz, optional)

Race setup results—Calculated from the values entered above.

Front wheel rate—

Rear wheel rate—

Spring for target front Hz—

Spring for target rear Hz—

Formula

Wheel rate = spring rate × motion ratio²

Ride frequency = (1 ÷ 2π) × √(wheel rate × 386.09 ÷ sprung corner weight)

For this page, motion ratio is defined explicitly as spring travel ÷ wheel travel.

How to use it

Enter front and rear spring rates, measured motion ratios, and sprung corner weights. Optional target frequencies let the calculator estimate the spring rates required to reach those frequencies under this simplified model.

Understanding the result

Wheel rate is usually more useful than spring rate alone because suspension geometry changes how much of the spring stiffness reaches the wheel. Ride frequency adds the supported mass to the comparison. Anti-roll bars, tire stiffness, damping, aero load, bump stops, installation friction, and non-linear geometry are not included in this simplified calculation.

Important: Racing setup is vehicle-, tire-, track-, and rules-dependent. Treat calculated values as planning targets, not guaranteed safe settings.

Motorsports Learning & Resources

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National Motorsport AcademyOnline motorsport engineering degrees and industry-led training.Purdue Motorsports EngineeringMotorsports engineering education, projects, and career pathways.SAE International – Vehicle DynamicsEngineering fundamentals for acceleration, braking, handling, steering, and suspension.Formula SAEStudent race-car engineering competition information and technical resources.OptimumGVehicle dynamics education, software, seminars, and engineering resources.Racecar EngineeringTechnical motorsport articles covering race-car design and technology.SCCASports Car Club of America competition, events, rules, and driver resources.NASA Pro RacingNational Auto Sport Association racing, time trial, HPDE, and competition resources.FIAInternational motorsport regulations, safety, and technical information.High Performance AcademyPractical performance-car tuning, wiring, data, suspension, and motorsport training.