225/75 is narrower and shorter than 235/75
The first series of numbers is the section width in mm 235mm wide
The second number represents the aspect ratio which is the percentage of width. So 75% of 235 is the sidewall height
R=Radial
15= 15 inch wheel
So if you want a taller tire, you need a tire with a higher aspect ratio. If you want the tire to be wider, increase the # to the desired width.
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