235/45-R17 tires are 1.87 inches (47.5 mm) larger in diameter than 205/40-R17 tires and the speedometer difference is 7.4%. The calculation results are presented in the form of visual infographics, on which tire with size 235/45 R18 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. In the tire comparison table above, you can see a detailed calculation of the size difference between 235/45 R17 and 235/40 R17 tire. The calculation results are presented in the form of visual infographics, on which tire with size 235/45 R17 is on top, and tire with size 235/40 R17 below. Both in the table and in the graph, the tires are 255/40-R18 tires are 0.63 inches (16 mm) larger in diameter than 235/40-R18 tires and the speedometer difference is 2.4%. 235/45-R18 tires are 1 inch (25.4 mm) larger in diameter than 235/45-R17 tires and the speedometer difference is 3.8%. The calculation results are presented in the form of visual infographics, on which tire with size 225/45 R17 is on top, and tire with size 235/40 R17 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. SO actually the gearing difference between 245/40 and 235/45 is actually only about 2.5%. I really can't see it making a difference. Wouldn't the 235/45 suit the rim (8.5" i think) then the 225/45? Looks like the 235 is 7mm higher then standard though, would that matter on a car running standard (sport) ride height? Thanks 245/40-R20 tires are 0.61 inches (15.5 mm) smaller in diameter than 235/45-R20 tires and the speedometer difference is 2.1%. If you have 8 wides x 17, then 235/40-17; if you have 7.5 wides x 17, then 225/45-17. Rule of thumb is 90% rimwidth coverage of tire's section mm width. Thus 225 mm should have an 8-wide rim; 235 mm should have an 8.5-wide rim. Factory BMW wheels are a bit on the narrow side with 7.5s and 8.5s available. 215/45-R18 tires are 0.22 inches (5.5 mm) larger in diameter than 235/40-R18 tires and the speedometer difference is 0.8%. In the tire comparison table above, you can see a detailed calculation of the size difference between 215/45 R17 and 235/45 R17 tire. The calculation results are presented in the form of visual infographics, on which tire with size 215/45 R17 is on top, and tire with size 235/45 R17 below. Both in the table and in the graph, the tires are 255/45-R17 tires are 0.22 inches (5.5 mm) smaller in diameter than 235/50-R17 tires and the speedometer difference is 0.8%. 235/40-R19 tires are 1.85 inches (47 mm) smaller in diameter than 235/50-R19 tires and the speedometer difference is 6.5%. 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 Better Fuel Economy Factory Ratios Increased Power. vs 255/50-16 vs 225/55-16 vs 275/40-17 vs 225/50-16 vs 275/45-16. 235/55-R16 tires are 0.53 inches (13.5 mm) larger in diameter than 245/50-R16 tires and the speedometer difference is 2.0%. .
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    • 235 40 vs 235 45