// multi-utility computation suite · offline · instant · precise
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│ [c] calcalyst_ │
│ computation suite │
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⌫
auto.tire-size Calculator
Decodes a tyre size code into actual dimensions — outer diameter, sidewall height, circumference — and calculates effective vehicle speed at a given speedometer reading. Essential when fitting non-standard sizes to check speedometer accuracy and clearance.
Inputs
Width
Horizontal extent perpendicular to the length.
Aspect
Reference formula or conversion factor shown for context.
Rim
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Speed
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Results
outer diameter (mm)
The computed diameter -- twice the radius.
sidewall height (mm)
The computed height.
circumference (m)
Sample size or count used in the calculation.
RPM at
The value at the specified point or condition.
tyre code
Reference formula or conversion factor shown for context.