15*2.54 = 38.1 centimeters tire hole diameter.
(60% of 225 ) * 2 = 27 centimeters 2 heights of tire wall.
Total wheel diameter = 65.1 centimeters.
Calculate the new size satisfying the desired rim size in accordance to this figure +/- 5 millimeters.
Additionally, this link provides a helpful chart relating rim width to a tire's: http://www.tyresizecalculator.com/ch...rim-size-chart
This snapshot shows the portion of interest:
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