Enter your Front Left, Front Right, Rear Left, and Rear Right Weight values (in your chosen Weight Unit) to calculate your Cross Weight Percentage — plus your Total Weight, Front Weight, Left Side Weight, and the raw Cross Weight (LF+RR) sum that tells you how well your car's diagonal balance is dialed in.
Cross Weight Percentage
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Total Weight
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Front Weight
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Left Side Weight
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Cross Weight (LF+RR)
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Cross weight percentage is the diagonal weight (left front + right rear) divided by total weight. It determines handling balance - 50% provides neutral handling, above 50% promotes oversteer, and below 50% promotes understeer.
For most racing applications, 50-52% cross weight is ideal for oval track racing. Road racing typically uses 49-51%. Street cars usually run closer to 50% for balanced handling.
Use four corner scales or a single scale with three equal-height spacers. Ensure the car is on level ground, fuel tank is at race level, and driver/ballast is in position. Take measurements with suspension settled.
Uneven corner weights can result from bent chassis, uneven ride heights, different spring rates, worn suspension components, or improper ballast placement. Adjustable coilovers help correct imbalances.
Higher cross weight (above 50%) makes the car looser and more likely to oversteer. Lower cross weight creates understeer tendencies. The optimal percentage depends on track type and driving style.
Cross weight and wedge refer to the same measurement - the diagonal weight distribution. The terms are used interchangeably in racing to describe the left front + right rear weight percentage.
Adjust corner weights by changing ride heights with coilovers, moving ballast, or using adjustable spring perches. Small adjustments have big effects - make changes incrementally and re-measure.
Front weight distribution varies by vehicle type: front-wheel drive cars typically run 58-62%, rear-wheel drive sports cars 48-52%, and race cars are optimized based on track requirements and aerodynamics.