245/50-R20 tires are 1.93 inches (49 mm) smaller in diameter than 245/60-R20 tires and the speedometer difference is 6.1%.
Better Fuel Economy Factory Ratios Increased Power. vs 245/45-18 vs 255/40-18 vs 225/45-18 vs 255/35-18. 245/35-R19 tires are 0.04 inches (0.9 mm) larger in diameter than 245/40-R18 tires and the speedometer difference is 0.1%.
Also, the online application calculates the difference in real speed and speedometer readings if the difference between tire 245/50 R18 and tire 245/45 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. In the tire comparison table above, you can see a detailed calculation of the size difference between 245/45 R20 and 235/35 R19 tire. The calculation results are presented in the form of visual infographics, on which tire with size 245/45 R20 is on top, and tire with size 235/35 R19 below. Both in the table and in the graph, the tires are Ordered 4/8/18, Delivered 8/2/18: 2019 Mustang GT Premium, Ruby Red, 401a, Magneride, 19" Nickel Wheels, Security Package, Roush Axle-Back Exhaust FUdQ9. 36 65 440 202 149 253 138 378 42