22555-R18 tires are 1.7 inches (43.3 mm) larger in diameter than 255/50-R16 tires and the speedometer difference is 6.1%. 22565-R17 tires are 1.66 inches (42.1 mm) larger in diameter than 225/50-R18 tires and the speedometer difference is 5.8%.

Compare255/45 R18 vs 225/50 R18. Tire Size and Comparison Calculator calculate tire diameter from code and compare speedometer differences for tire sizes. The first number 255 is the tire width in millimeters. The 2nd number 45 is used to calculate the sidewall height or "aspect ratio", by percentage.

Bothin the table and in the graph, the tires are compared according to the following indicators: overall diameter, section width, circumference, sidewall height and clearance. Also, the online application calculates the difference in real speed and speedometer readings if the difference between tire 225/55 R18 and tire 235/50 R18 is significant.

Bothin the table and in the graph, the tires are compared according to the following indicators: overall diameter, section width, circumference, sidewall height and clearance. Also, the online application calculates the difference in real speed and speedometer readings if the difference between tire 225/55 R18 and tire 245/45 R18 is significant.

Thefirst number 225 is the tire width in millimeters. The 2nd number 50 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 225/50 R 18 tire is 60% of 225 = 192. The 3rd number 18 (generally preceded by an "R") is Rim Diameter in inches. This is the diameter of the rims bead seat base, not
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225 50 r18 vs 225 55 r18