Thecalculation results are presented in the form of visual infographics, on which tire with size 245/60 R18 is on top, and tire with size 255/70 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.
Compare205/55 R18 vs 225/40 R18. So, the sidewall height of a 205/55 R 18 tire is 60% of 205 = 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 the diameter of the outer rim edge. The rim edge, or lip, extends past the tire bead seat to hold the bead and22560-R18 tires are 0.89 inches (22.5 mm) smaller in diameter than 225/65-R18 tires and the speedometer difference is 3.0%.
21565-R16 tires are 0.74 inches (18.8 mm) smaller in diameter than 225/55-R18 tires and the speedometer difference is 2.7%.Compare225/60 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 225 is the tire width in millimeters. The 2nd number 60 is used to calculate the sidewall height or "aspect ratio", by percentage. Belowis the list of all possible alternatives to P 225/55 R18 within delta of no more than three percent which means you can shift to wider wheels with smaller aspect ratio and vice versa. Wheel experts do not recommend to decrease the diameter of the wheel. 255/40 R17 vs 225/55 R18: 225/55 R18 vs 225/60 R18: Discussion. Name * E-mail 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. BBVr.