Use calipers when available
Powerflex identifies a vernier caliper as the most accurate of its two suggested methods. Measure the bar adjacent to the rubber bush and record the dimension and location. Ensure you are measuring the bar rather than the outside of the bush or bracket.
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Use an open-ended spanner as a gauge
If calipers are unavailable, try open-ended spanners over the bar alongside the bush. Move through sizes until one fits closely. Its marked size is an indication of the required bush diameter, not a reason to force a tight spanner onto the bar.
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Match the actual kit
Use the measurement with the exact vehicle and Powerflex part listing. Resolve an ambiguous fit or between-size reading with the supplier before ordering. Keep the measured value in the installation notes.
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Sources / references 1
- Powerflex — Measuring your anti-roll bar ↗Reviewed Oct 8, 2026
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