235 45 r18 vs 235 40 r18
The2nd number 45 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 235/45 R 18 tire is 60% of 235 = 192. The 3rd number 18 (generally preceded by an "R") is Rim Diameter in inches. This is the diameter of the rims bead seat base, not the diameter of the outer rim edge.
Also the online application calculates the difference in real speed and speedometer readings if the difference between tire 245/50 R18 and tire 245/45 R18 is significant. Calculate the difference in inches. If you want to compare other tire sizes, then select their sizes in the drop-down fields and click on the green button. Hereyou can compare different tire sizes against your original dimension and show alternative tire sizes. 40: 18: 61.05 (2' 0.04") -1%: 215: 45: 17: 60.77 (1' 11.93") 190.9 (6' 3.16") -1.4%: 225: 40: 18: 61.85 (2' 0.35") 194.3 (6' 4.5") 0.3%: 225: 45: 17: 61.56 (2' 0.24") 193.4 (6' 4.14") -0.2%: 225: 50: 16: 61.37 (2' 0.16") 192.8 (6Thecalculation results are presented in the form of visual infographics, on which tire with size 225/60 R18 is on top, and tire with size 235/55 R18 below. Both in the table and in the graph, the tires are compared