23555-R18 tires are 0.93 inches (23.5 mm) larger in diameter than 235/50-R18 tires and the speedometer difference is 3.3%. SpeedoDifference between Wheels 12.1% Comparison Table. Model. 235/45 R18. 235/50 R18. Section Width. i. 235 mm. Sidewall Height. i. 4.16" 4.63" Zimnípneumatiky 235/45 R18 skladem. Bezpečný výběr i nákup. Doručíme do 24 hodin. Poradíme s výběrem. Pravidelné akce a slevy na Zimní pneumatiky 235/45 R18. Široká 23540-R19 tires are 0.07 inches (1.9 mm) larger in diameter than 235/45-R18 tires and the speedometer difference is 0.3%. Sizedifference between 225/45 R18 and 225/40 R18 tires. In the tire comparison table above, you can see a detailed calculation of the size difference between 225/45 R18 MostPopular 225/45-R18 Comparisons vs 245/40-18 vs 235/45-18 vs 245/45-18 vs 235/40-18 vs 225/40-18 vs 225/50-18 vs 255/40-18 vs 225/50-17 Similar to the Miata tire calculator and 1010 tire calculator. Tiresize comparison in inches. 225/45 R18 vs 245/45 R18. Calculate. CM INCHES. If your speedometer reads: Real speed is: Size difference between 225/45 R18 and 245/45 24545-R18 tires are 0.06 inches (1.6 mm) smaller in diameter than 225/55-R17 tires and the speedometer difference is 0.3%. LpcD.