How to use this calculator
- Set the car condition. Use realistic driver, fuel, tire pressure and ride-height conditions.
- Enter four scale readings. Enter front-left, front-right, rear-left and rear-right readings.
- Read balance percentages. Review front/rear, left/right and cross weight.
- Use wedge delta. Use wedge delta as a simple diagonal imbalance indicator.
How it works
Four scale readings let you see total weight and diagonal balance. Cross weight is (front left + rear right) / total x 100. Wedge delta is (front left + rear right) - (front right + rear left).
Corner mass also feeds suspension work. Use it with the suspension wheel rate calculator to estimate ride frequency from spring rate and motion ratio.
Worked example
Verified against the live calculator
With 360, 350, 340 and 350 kg on the four corners, total weight is 1,400 kg. Cross weight is (360 + 350) / 1,400 = 50.7%, and wedge delta is 20 kg.
Frequently asked questions
What is cross weight?
Cross weight is (front left + rear right) divided by total weight, usually shown as a percent.
What is wedge delta?
Wedge delta is (front left + rear right) minus (front right + rear left).
Should corner weights include the driver?
For setup work, measure the car in the same condition it runs: driver or ballast, fuel state, tire pressures and ride heights set.
Is 50% cross always the target?
No. The target depends on vehicle type, track direction, driver preference and setup goals.
Method & assumptions
- Inputs are four static scale readings in the same units.
- Target cross weight depends on application; this calculator only reports the balance.