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Tire Size Comparator
Compare nominal tire diameter, circumference and speedometer scale for two metric tire codes.
Original metric tire code, Replacement metric tire code, Indicated speed (any distance/hour unit)
JSON
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the labelled values and use the displayed units.
- Choose Calculate result and inspect the full report, assumptions and undefined/no-solution status.
- Choose Download result to save the complete JSON. Reset clears results and restores the example controls.
Examples
Original metric tire code: 205/55R16
Replacement metric tire code: 225/45R17
Indicated speed (any distance/hour unit): 100
Limitations
- Only width/aspectRrim such as 205/55R16; width 100–500mm, aspect 10–100%, rim 8–40in. Nominal unloaded geometry; no fitment, clearance, load, wear or legal compatibility certification.
- Scalar numeric inputs use explicit decimal syntax and IEEE-754 arithmetic; unless a tighter bound is stated, positive values are 1e-12–1e12 and nonnegative values 0–1e12. Derived inventory counts above 1 billion and nonfinite results are refused. Combined input limit400,000 UTF-8 bytes;complete JSON output limit4MiB. Numeric/code input controls allow128 characters. All processing stays in your browser.
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