Enter your Arm Length, Mid Section Width, Outside Diameter, Wall Thickness, and Material Modulus into the Anti-Roll Bar Size Calculator to find your bar's Roll Stiffness, Moment of Inertia, and Estimated Bar Weight — plus the Required Diameter needed to hit your Target Roll Stiffness.
Roll Stiffness
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Moment of Inertia
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Required Diameter for Target
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Estimated Bar Weight
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Anti-roll bar sizing depends on your car's weight distribution, suspension geometry, and desired handling balance. Start with manufacturer recommendations, then adjust diameter based on testing and driver feedback.
Solid bars are simpler and cheaper but heavier. Hollow bars reduce weight while maintaining stiffness, but require precise wall thickness calculations and are more expensive to manufacture.
Roll stiffness increases exponentially with diameter (to the 4th power). A small increase in diameter creates a large increase in stiffness, so make diameter changes gradually.
This depends on your car's natural balance and desired handling characteristics. Stiffer front bars reduce understeer, while stiffer rear bars reduce oversteer. Start with mild adjustments.
Steel is most common due to cost and availability. Aluminum is lighter but less stiff. Titanium offers the best strength-to-weight ratio but is expensive. Choose based on your budget and weight requirements.
Signs include excessive tire wear on one side, poor grip in corners, harsh ride quality, or the car feeling unstable over bumps. Reduce stiffness or adjust suspension settings if these occur.
Yes, through adjustable end links, different mounting points, or blade-style adjustable arms. These allow fine-tuning without purchasing new bars, making setup optimization easier.
Anti-roll bars work with springs to control body roll. Higher spring rates reduce the need for stiff anti-roll bars. Balance both to achieve your desired roll stiffness and ride quality.