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Tire Size Comparison — result sheet
Calculate tire section height and overall diameter, then compare diameter and indicated-speed effects.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Section height = width x aspect ratio / 100; overall diameter = wheel diameter + two section heights converted to inches.
The comparison reports geometry and a simple indicated-speed ratio without claiming that a tire will fit a particular vehicle.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Original tire width — mm; minimum 1; maximum 1000
- Original aspect ratio — %; minimum 1; maximum 200
- Original wheel diameter — in; minimum 1; maximum 100
- Comparison tire width — mm; minimum 1; maximum 1000
- Comparison aspect ratio — %; minimum 1; maximum 200
- Comparison wheel diameter — in; minimum 1; maximum 100
Worked example
| Input | Value |
|---|---|
| Original tire width | 265 |
| Original aspect ratio | 70 |
| Original wheel diameter | 17 |
| Comparison tire width | 265 |
| Comparison aspect ratio | 40 |
| Comparison wheel diameter | 23 |
The calculator compares the original and alternative overall diameters and estimates actual speed at 60 indicated.
Assumptions and limits
- The tire notation is interpreted as width in millimeters, aspect ratio in percent, and wheel diameter in inches.
- Clearance, load rating, wheel width, gearing, speedometer calibration, and manufacturer fitment are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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