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Enter your assumptions above and calculate locally in this browser. No data is uploaded.
How this calculator works
Available axle rating from tyres = rated capacity per tyre × tyre count; margin = tyre capacity − axle rating.
Important: Not a tyre fitment or roadworthiness approval. OE specifications, dual-tyre derating, inflation, speed/load index, rims and legislation all matter.
Illustrative inputs only. This is not official vehicle safety, valuation or legal advice.