Tire Calculator - Free

There are many good tire calculator apps so why choose this one? Most other tire apps allow you to enter two different tire sizes and then provide a detailed numerical comparison of their total diameters etc.
TireCalc Free takes a different approach - one that is more suited to the real-world scenario of having existing tires mounted on a vehicle but then wanting to replace the wheels using rims and tires that have different dimensions while preserving the same overall diameter as the existing wheels.
TireCalc Free makes this easy by:
\trapid input of the existing tire size using 'spinner-dials' rather than using keyboard entry;
\tinstantly providing a list of alternative tire sizes that provide a good match the existing tire's overall diameter;
\tthe list of alternative sizes can be filtered down by specifying a desired rim size and/or maximum allowed difference in diameter (expressed as a percentage): this 'difference percentage' equals the resulting speedometer error.
\tAgain, the selection of preferred rim size and maximum difference is made easy using convenient spinner-dials rather than by old-fashioned text input.
TireCalc Free also provides additional pages that explain everything you need to know when shopping for new tires:
\texplanation of sidewall markings (e.g.
245 / 45 / ZR17 etc);
\tdefinition of 'aspect ratio';
\tmath formula used to calculate the overall wheel diameter;
\ttable of speed-rating code letters;
\ttable of maximum load indices.

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