Also the online application calculates the difference in real speed and speedometer readings if the difference between tire 225/60 R18 and tire 245/55 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. 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 235/60 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. 22560-18 245/55-18 Difference; Diameter inches (mm) 28.63 (727.2) 28.61 (726.7)-0.02 (-0.5) -0.1%: Width inches (mm) 8.86 (225) 9.65 (245) 0.79 (20) 8.9%: Whenyou need new 225/55R18 tires, you can trust the experts at Tire Rack to help you find exactly what you need, when you need it. (55) What is the specials & closeouts filter? Specials & Closeouts Free Road Hazard Protection $43.60 value. Two-year coverage. 70K Mile Manufacturer's Warranty. Compare225/65 R17 vs 235/60 R18. Tire Size and Comparison Calculator calculate tire diameter from code and compare speedometer differences for tire sizes. The first number 225 is the tire width in millimeters. The 2nd number 65 is used to calculate the sidewall height or "aspect ratio", by percentage. Inthe tire comparison table above, you can see a detailed calculation of the size difference between 265/60 R18 and 245/60 R18 tire. The calculation results are presented in the form of visual infographics, on which tire with 22560-R18 tires are 0.45 inches (11.5 mm) larger in diameter than 235/55-R18 tires and the speedometer difference is 1.6%. Thecalculation results are presented in the form of visual infographics, on which tire with size 225/60 R18 is on top, and tire with size 255/55 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. Tire1 / R 225 55 R 18 Tire 2 / R 235 50 R 18 Inch Mill KPH MPH Odometer Reading If you replace 320/60/18 with 235/60/18 for Odometer reading 1000 the actual distance traveled Inthe tire comparison table above, you can see a detailed calculation of the size difference between 235/60 R18 and 155/85 R18 tire. The calculation results are presented in the form of visual infographics, on which tire with size 235/60 R18 is on top, and tire with size 155/85 R18 below. Both in the table and in the graph, the tires are 69i2O.