The 225/45R17 Run Flat tire has the following features: the first three digits 225 refer to the width of the tire in millimetres. The second two-digit number 45 refers to the ratio between the height of the sidewall and the width of the tire. R stands for “Radial” and the last two figures 17 indicate the wheel diameter in inches.
205/50 r17 -2.3% 205/55 r17 +0.8% 215/50 r17 -0.8% 215/55 r17 +2.5% 225/45 r17 -2.8% 225/50 r17 +0.8% 235/45 r17 -1.4% 235/50 r17 +2.3% 245/40 r17 -3.7% 255/40 r17 -2
The calculation results are presented in the form of visual infographics, on which tire with size 225/55 R17 is on top, and tire with size 235/45 R17 below. Both in the table and in the graph, the tires are compared according to the following indicators: overall diameter, section width, circumference, sidewall height and clearance.
225/40-R18 tires are 0.11 inches (2.9 mm) larger in diameter than 225/45-R17 tires and the speedometer difference is 0.4%.
The first number 225 is the tire width in millimeters. The 2nd number 60 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 225/60 R 17 tire is 60% of 225 = 192. The 3rd number 17 (generally preceded by an "R") is Rim Diameter in inches.
245/45-R17 tires are 0.18 inches (4.5 mm) smaller in diameter than 225/50-R17 tires and the speedometer difference is 0.7%.
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245 40 r17 vs 225 45 r17
