The calculation results are presented in the form of visual infographics, on which tire with size 225/45 R19 is on top, and tire with size 235/40 R19 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. With a diameter of 25.72 inches, the 245/40R18 provides 0.31 inches (8mm) more ground clearance than the 235/40R18 at 25.4 inches. This extra clearance is useful for off-road driving over obstacles and rough terrain. However, the larger 245/40R18 diameter causes a slightly lower speedometer reading than the 235/40R18 one. 215/50/17x7" rim width is the stock size for Mk4.5 Titanium and Titanium X models. Your wheel/tyre spec is stock for Mk4 same models with a 7.5" rim width. I'm not sure why Ford altered the specification but it may be that some 17" wheel users also found the 45 profile gave too harsh a ride - as with the 18" wheel change from 40 to 45 profile. 235/50-R17 tires are 3.85 inches (97.8 mm) larger in diameter than 235/40-R15 tires and the speedometer difference is 14.7%. 235/40-R19 tires are 0.28 inches (7.1 mm) smaller in diameter than 245/45-R18 tires and the speedometer difference is 1.1% 235/45-18 235/40-18 Difference; Diameter inches (mm) 26.33 (668.7) 25.4 (645.2)-0.93 (-23.5) -3.5%: Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%: Circum. inches (mm) 82.71 (2100.78) 79.8 (2026.96)-2.91 (-73.83) -3.5%: Sidewall Height inches (mm) 4.16 (105.75) 3.7 (94)-0.46 (-11.75) -11.1%: Revolutions per mile (km) 766.07 (476.01) 793.97 In the tire comparison table above, you can see a detailed calculation of the size difference between 245/40 R20 and 235/45 R20 tire. The calculation results are presented in the form of visual infographics, on which tire with size 245/40 R20 is on top, and tire with size 235/45 R20 below. Both in the table and in the graph, the tires are The 31×10.50R15 tire is 2.1 inches or 53.34 mm taller than the 235/75R15 tire. This means that the overall diameter of the 31-inch tire is 7.3% greater than that of the 235/75R15 tire. The 31-inch tire measures 30.98 inches or 786.84 mm in height, while the shorter 235/75R15 measures only 28.88 inches or 733.5 mm in height. .
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    • 235 40 vs 235 45