Sizedifference between 245/40 R18 and 225/45 R18 tires. In the tire comparison table above, you can see a detailed calculation of the size difference between 245/40 R18 and 225/45 R18 tire. The calculation Thedifference in sizes and parameters between the 235/40 R18 tire and 235/45 R18 tire. Detailed calculations and graphics. Calculate the difference in inches. Tire calculator online . Top comparisons; 225/45 R18: 215/60 R16: 245/40 R18: 225/55 R17: Inthe tire comparison table above, you can see a detailed calculation of the size difference between 245/40 R18 and 245/45 R17 tire. The calculation results are presented in the form of visual infographics, on which tire with size 245/40 R18 is on top, and tire with size 245/45 R17 below. Both in the table and in the graph, the tires are 22545-17 245/40-18 Difference; Diameter inches (mm) 24.97 (634.3) 25.72 (653.2) 0.74 (18.9) 3%: Width inches (mm) 8.86 (225) 9.65 (245) 0.79 (20) 8.9%: Circum. inches 22540R18, 225-45R18 tire size comparison with Size calculator. Use our tire calculator to compare tire sizes based on tire diameter, radius, sidewall height, Thedifference in sizes and parameters between the 275/40 R18 tire and 275/35 R18 tire. Detailed calculations and graphics. Tire calculator online . Top comparisons; 245/45 R17: 255/40 R18: 265/45 R18: Sizes often compared to Inthe tire comparison table above, you can see a detailed calculation of the size difference between 225/45 R17 and 225/40 R18 tire. The calculation results are presented in the form of visual infographics, on which tire with 24545-R18 tires are 0.05 inches (1.3 mm) larger in diameter than 225/60-R16 tires and the speedometer difference is 0.2%. Sizesfor comparison of tires 225/45 R18 R18 215/45 R18 -1.4% 225/40 R18 -3.5% 225/50 R18 +3.3% 235/40 R18 -2.3% 235/45 R18 +1.4% 245/40 R18 -1.1% 245/45 R18 +2.7% Thecalculation results are presented in the form of visual infographics, on which tire with size 225/55 R18 is on top, and tire with size 245/40 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. myRH.