245/45-R18 tires are 0.57 inches (14.5 mm) smaller in diameter than 235/50-R18 tires and the speedometer difference is 2.1%. 4976. Better Fuel Economy Factory Ratios Increased Power. 245/75-R17 tires are 2.89 inches (73.5 mm) larger in diameter than 245/60-R17 tires and the speedometer difference is 9.2%.

245/45-R17 tires are 0.65 inches (16.5 mm) larger in diameter than 255/40-R17 tires and the speedometer difference is 2.5%.

Published by Dustin Babich on 12 June 2023. The main difference between 245/45zr20 and 245/45r20 is the tire type. A ‘z’ rating means the tire has a speed rating of over 149 mph, while ‘r’ indicates a standard performance tire with a maximum speed of 106 mph. Both refer to the same size of tire – 245mm width, 45mm aspect ratio, and a
245/40-R19 tires are 0.31 inches (8 mm) larger in diameter than 235/40-R19 tires and the speedometer difference is 1.2%.

245/40-R17 tires are 0.26 inches (6.5 mm) smaller in diameter than 225/45-R17 tires and the speedometer difference is 1.0%.

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difference between 245 40 and 245 45