Inthe tire comparison table above, you can see a detailed calculation of the size difference between 235/40 R18 and 215/50 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 215/50 R18 below. Both in the table and in the graph, the tires are compareprices for Sailun Atrezzo Elite 205/55 R16 94V XL Product info ⇒ Reifenserie: Atrezzo elite • Fuel efficiency: C (A to E) • Wet grip: B (A to E) • External rolling noise: 23560-R18 tires are 1.36 inches (34.5 mm) larger in diameter than 225/55-R18 tires and the speedometer difference is 4.7%. Inthe tire comparison table above, you can see a detailed calculation of the size difference between 235/45 R17 and 235/40 R18 tire. The calculation results are presented in the form of visual infographics, on which tire with size 235/45 R17 is on top, and tire with size 235/40 R18 below. Both in the table and in the graph, the tires are 23540-18 245/45-18 Difference; Diameter inches (mm) 25.4 (645.2) 26.68 (677.7) 1.28 (32.5) 5%: Width inches (mm) 9.25 (235) 9.65 (245) 0.39 (10) 4.3%: Circum. inches Thedifference in sizes and parameters between the 225/50 R18 tire and 225/40 R18 tire. Detailed calculations and graphics. Calculate the difference in inches. Tire calculator online . Top comparisons; 235/40 R18: 225/45 R17: 195/65 R15: 245/40 R18: 255/35 R18: compareprices for Sailun Atrezzo Elite 185/50 R16 81V Product info ⇒ Reifenserie: Atrezzo elite • Fuel efficiency: D (A to E) • Wet grip: B (A to E) • External rolling noise: Thedifference in sizes and parameters between the 245/40 R18 tire and 235/50 R18 tire. Detailed calculations and graphics. Calculate the difference in inches. Tire calculator online . Top comparisons; 235/45 R18: 245/45 R18: 215/65 R16: 225/55 R17: 235/55 R18: TacomaWorld is not owned by, or affiliated with Toyota Motor Corporation. 215/40-R18 tires are 0.31 inches (8 mm) smaller in diameter than 225/40-R18 tires and the speedometer difference is 1.3%. s6u5Gh0.