Re: Tire Size Explanation
Multiply the width X 25.4 to get your mm sizing so 12.5 X 25.4=318
total height of tire = rims + sidewall heightx2.
To find aspect ratio:
divide the side section of tire by the width.
if the rim is 15" then the combined upper and lower side sections must be 14 to make up the 29" height.
14/2 =7 7 being the section width.
7/12.5 is roughly 56 round to 55 as I've never seen a tire that wasn't a product of 5 and you end up with a 55.
So I believe your looking for a 318/55 r15 tire.
Just checked the closest is a 315/60R15 or a 325/60r15
Brandon J. licence 1NASTY67
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