tire sizes

The first is the width in mm (25.4 mm = 1 ")

The second is the profile. It is the percentage of the width that equals the height of the tire on each side of the wheel.

The third is the wheel size.

205/65/15 is the tire

205 / 25.4 = 8.0

8.0 x .65 = 5.2

5.2 x 2 = 10.4 (Since there is a profile on each side of the wheel)

10.4 + 15 = 25.4 tall

So the tire is 25.4 x 8 x15

 
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