Sizedifference between 215/45 R18 and 245/40 R18 tires. In the tire comparison table above, you can see a detailed calculation of the size difference between 215/45 R18 and 245/40 R18 tire. The calculation results are presented in the form of visual infographics, on which tire with size 215/45 R18 is on top, and tire with size 245/40 R18 below. Tiresize comparison. 275/40 R18 vs 245/45 R18. Calculate. CM INCHES. If your speedometer reads: Real speed is: Size difference between 275/40 R18 and 245/45
22555-R18 tires are 0.06 inches (1.6 mm) larger in diameter than 245/45-R19 tires and the speedometer difference is 0.2%.
BetterFuel Economy Factory Ratios Increased Power. vs 235/60-18 vs 235/55-18. 255/55-R18 tires are 0.43 inches (11 mm) larger in diameter than 245/55-R18 tires and the speedometer difference is 1.5%.
Inshort, the difference in those 2 sizes is that one has a sidewall height that is 45% of the 245mm section width. The other sidewall is 40% of the 245mm width. Mathematically, that means that the "40" tire is 12.25mm less tall (on a radius, not diameter), or an overall 25mm (1 inch) in diameter. '11 LTZ, born Aug 2010, Fairfax, KS.
Thecalculation results are presented in the form of visual infographics, on which tire with size 245/45 R17 is on top, and tire with size 245/40 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.
FitmentGuide. The overall diameters of the 235/45R18 and 245/45R18 are within 1.3% of each other. According to the 3% replacement guideline, these sizes are interchangeable
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    • 245 45 r18 vs 245 40 r18