Transport & Manufacturing
Anti-Roll Bar Stiffness Torsional Rigidity Sizer
Calculate anti-roll bar stiffness torsional rigidity using the stated engineering or scientific relationship and adjustable field inputs.
Preparing your result…
What this calculator does
Calculates Anti-Roll Bar Stiffness Torsional Rigidity Sizer using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
Solid bar: J = πd⁴ ÷ 32; torsional stiffness = G·J ÷ L (N·m/rad); with one arm fixed, end-of-arm stiffness k = G·J ÷ (L·a²)
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Ideal straight solid torsion section: polar area moment J=πd⁴/32, angular stiffness GJ/L (N·m/rad). With one arm fixed and rigid lever length a, endpoint force/displacement stiffness k=GJ/(La²), N/m.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • The original expression is an ideal linear endpoint stiffness, not automatically axle roll stiffness. Two-arm relative motion, both-end displacement, arm bending, link angles, bush compliance, track and wheel motion ratios change the result. State the exact boundary/measurement definition and do not introduce an unexplained factor-of-two conversion.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Bar diameter (mm) | Active torsion length (mm) | Lever arm length (mm) | End-of-arm stiffness |
|---|---|---|---|---|
| Worked example | 22 | 900 | 200 | 50.6595 N/mm |
| Half the amounts | 11 | 450 | 100 | 12.6489 N/mm |
| Double the amounts | 44 | 1,800 | 400 | 114.9901 N/mm |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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