22540 R18 Tyre characteristics. BSW XL. Speed index Y (max. 300 km/h) Load index 92 (max. 630 kg) GTIN / EAN 8807622140372 Item number 15280339. Description. Size: 23550-R18 tires are 1.28 inches (32.5 mm) larger in diameter than 225/45-R18 tires and the speedometer difference is 4.7%. 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 235/50 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. 22540-R18 tires are 0.11 inches (2.7 mm) larger in diameter than 195/65-R15 tires and the speedometer difference is 0.4% Thecalculation results are presented in the form of visual infographics, on which tire with size 225/40 R18 is on top, and tire with size 225/45 R17 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. 22555-R18 tires are 0.89 inches (22.5 mm) larger in diameter than 225/50-R18 tires and the speedometer difference is 3.2%. Tiresize comparison. 235/40 R18 vs 225/45 R18. Calculate. CM INCHES. If your speedometer reads: Real speed is: Size difference between 235/40 R18 and 225/45 R18 tires. In the tire comparison table above, you can 21550-R18 tires are 0.49 inches (12.5 mm) larger in diameter than 225/45-R18 tires and the speedometer difference is 1.9%. Also the online application calculates the difference in real speed and speedometer readings if the difference between tire 225/50 R17 and tire 225/45 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. 22545-R18 tires are 3.13 inches (79.5 mm) smaller in diameter than 235/60-R18 tires and the speedometer difference is 10.8%. QZgeBb.