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. Also, the online application calculates the difference in real speed and speedometer readings if the difference between tire 265/70 R17 and tire 245/65 R17 is significant. 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. Also, the online application calculates the difference in real speed and speedometer readings if the difference between tire 245/60 R18 and tire 255/60 R18 is significant. Compare 245/60 R18 vs 265/60 R18. Tire Size and Comparison Calculator calculate tire diameter from code and compare speedometer differences for tire sizes. The first number 245 is the tire width in millimeters. The 2nd number 60 is used to calculate the sidewall height or "aspect ratio", by percentage. 305/70-R16 tires are 1.16 inches (29.5 mm) larger in diameter than 265/75-R16 tires and the speedometer difference is 3.5%. The difference in tire width between the 265 and 245 is 20mm, making the 245 a close contender for the widest tire. Featuring a higher contact pressure per square inch, the 245 can quickly move through puddles than the 225, which has the least tire width. 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. Also, the online application calculates the difference in real speed and speedometer readings if the difference between tire 245/70 R16 and tire 265/60 R18 is significant. 235/85-R16 tires are 0.08 inches (2 mm) larger in diameter than 265/75-R16 tires and the speedometer difference is 0.2%. 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. Also, the online application calculates the difference in real speed and speedometer readings if the difference between tire 245/75 R17 and tire 285/70 R17 is significant. 3WaXY8H.