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Overall Diameter Calculator
This calculator allows you to enter your original fitment tyre size to calculate the diameter of the tyre (that is, the measurement from the top of the tyre to the ground). It will also calculate the rolling circumference. This is important if you are looking for a wider tyre, lower profile or changing rim size, as these figures need to be similar (+/- 2%) so there will be no effect on your speedometer and gearing. You can input a range of different sizes to a suitable size with equivalent diameters and rolling circumferences.
205 = Section Width 60 = Aspect Ratio 15 = Rim Width
Calculator Enter current size parameters and then press the calculate button:
Results
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