the245 is the width of the tire, the 45 is the aspect ratio of the tire, and 18 is the rim diameter. The aspect ratio means that the sidewall is 45% of the width of the tire. So for a 245/45 tire, the height of the sidewall is 245*.45. A common misconception is all tires with a 35 series tire (245/35, 235/35, 275/35, etc) are all the same Thecalculation results are presented in the form of visual infographics, on which tire with size 245/40 R18 is on top, and tire with size 245/35 R18 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. Thecalculation results are presented in the form of visual infographics, on which tire with size 245/40 R18 is on top, and tire with size 255/35 R18 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. Sizedifference between 235/40 R18 and 255/35 R18 tires. In the tire comparison table above, you can see a detailed calculation of the size difference between 235/40 R18 and 255/35 R18 tire. The calculation results are presented in the form of visual infographics, on which tire with size 235/40 R18 is on top, and tire with size 255/35 R18 below. The225/45r18 tire has a diameter of 25.97 inches, while the 245/40r18 is slightly smaller at 25.72 inches. This 0.25-inch reduction in overall height marginally decreases ground Compare205/55 R18 vs 225/40 R18. Tire Size and Comparison Calculator calculate tire diameter from code and compare speedometer differences for tire sizes. The first number 205 is the tire width in millimeters. The 2nd number 55 is used to calculate the sidewall height or "aspect ratio", by percentage. Thecalculation results are presented in the form of visual infographics, on which tire with size 225/50 R18 is on top, and tire with size 235/40 R18 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. Inthe tire comparison table above, you can see a detailed calculation of the size difference between 235/40 R18 and 225/40 R18 tire. The calculation results are presented in the form of visual infographics, on which tire with size 235/40 R18 is on top, and tire with size 225/40 R18 below. Both in the table and in the graph, the tires are Thewheel diameter is R18, which means it fits to a 18 inch/457.2mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 245/40 R20 (2211.68 mm), TheArivo ARZ4 summer tyre features an asymmetrical tread pattern which, the manufacturer reports, is "functionally differentiated in the medial and lateral sidewall" to improve steering performance in wet road conditions, and "ensure high-speed stability". In addition, the tyre's tread compound contains silica for "enhanced grip in wet road 7yHuyj.