Inthe tire comparison table above, you can see a detailed calculation of the size difference between 215/65 R16 and 225/55 R16 tire. The calculation results are presented in the form of visual infographics, on which tire with size 215/65 R16 is on top, and tire with size 225/55 R16 below. Both in the table and in the graph, the tires are
Thefirst number 205 is the tire width in millimeters. The 2nd number 45 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 205/45 R 17 tire is 60% of 205 = 192. The 3rd number 17 (generally preceded by an "R") is Rim Diameter in inches. This is the diameter of the rims bead seat base, not
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