๐ Tire Size Calculator
Enter your tire specs and get diameter, circumference, revs per mile, and speedometer error. All data stays in your browser.
๐ง Input
Width: 265 mm
Aspect: 70% of width
Rim: 17 inches
๐ Results
Enter your tire size above to see the calculations.
๐ง How It Works
This calculator uses the standard tire industry formula: Diameter = Rim + (2 ร Section Width ร Aspect Ratio รท 100 รท 25.4). The aspect ratio is the sidewall height as a percentage of the section width. Revs per mile is derived from 63,360 inches per mile divided by the circumference (ฯ ร diameter).
How to use: Enter your tire's section width (mm), aspect ratio (%), and rim diameter (inches). Click Calculate to see overall diameter, circumference, revs per mile, and sidewall height. Save results to compare multiple sizes.
Tip: A 3% difference in diameter from stock will cause noticeable speedometer error. Always verify with a tire professional before purchasing.
๐ Visual Comparison
Compare your calculated tire against saved history entries.
๐ Saved History
| Size | Diameter | Circumference | Revs/Mile | Sidewall | Action |
|---|
