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Torsion Bar Rates

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Bar Rate Calculation

The spring rate of a torsion bar can be calculated from the following measurements:

Measurements

BD - Bar Diameter

The outside diameter of the torsion bar material

BL - Bar Length

The overall length of the torsion bar

LL - Lever Length

The length of the lever arm that applies a twisting force to the torsion bar (from bar end to wheel centreline)

Calculation

SR - Spring Rate

= TR x BD⁴ / BL x LL²
(Where TR is torsional resistance of bar material)

The form below allows the spring rate to be calculated for a steel torsion bar (torsional resistance = 1,120,000).

Bar Diameter	inches
Bar Length	inches
Lever Length	inches
	lb/ft

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Note that measurements used here are in Imperial terms (inches, lb/ft), not metric measures.
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