6 calculators in this category
- Coil Spring Rate CalculatorHelical compression spring rate (Shigley / SAE HS-795)Spring rate is fixed by four things — wire diameter, mean coil diameter, the number of active coils and the material's shear…
- Wheel Rate & Motion Ratio CalculatorMotion ratio defined as spring travel ÷ wheel travelA spring rate printed on a coil tells you nothing until you know where the spring sits. Suspension leverage divides both the…
- Weight Transfer CalculatorSAE J670 vehicle dynamics terminology; NHTSA static stability factorWeight transfer is what a vehicle's centre of gravity does to its tire loads the moment it accelerates in any direction, and it…
- Wheel Offset & Backspacing CalculatorISO 3911 wheel and rim terminologyOffset and backspacing describe the same thing two different ways, which is why comparing an ET35 wheel with a…
- Towing Capacity & Payload CalculatorSAE J2807 tow-vehicle rating practiceThe number in the brochure is not your towing capacity. Your real limit is whichever of four separate ceilings you hit first…
- Trailer Tongue Weight CalculatorSAE J684 hitch classes; 10–15% conventional / 15–25% fifth-wheel practiceTongue weight is the downward force the trailer coupler puts on the hitch ball, and it is set almost entirely by where the…
Which one do you need?
- Coil Spring Rate Calculator
- Calculate helical spring rate from wire diameter, mean coil diameter and active coils. Get lb/in and N/mm, spring index, deflection and series or parallel rate.
- Wheel Rate & Motion Ratio Calculator
- Convert spring rate to wheel rate through motion ratio and installation angle. Get the rate at the tire, ride frequency and the spring rate a target needs.
- Weight Transfer Calculator
- Calculate lateral and longitudinal weight transfer from CG height, track and wheelbase. See dynamic axle loads, all four corner loads and rollover threshold.
- Wheel Offset & Backspacing Calculator
- Convert wheel offset to backspacing and back, and see exactly how far a new wheel moves inboard toward the suspension or outboard toward the fender.
- Towing Capacity & Payload Calculator
- Find your truck's real payload and maximum trailer weight from GVWR, GCWR, curb weight and hitch rating, and see which limit binds first. Check before towing.
- Trailer Tongue Weight Calculator
- Calculate trailer tongue or fifth-wheel pin weight from cargo position, check it against the 10-15% and 15-25% targets, and see how far to shift the load.
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