245/40-17 225/45-17 Difference; Diameter inches (mm) 24.72 (627.8) 24.97 (634.3) 0.26 (6.5) 1%: Width inches (mm) 9.65 (245) 8.86 (225)-0.79 (-20) -8.2%: Circum. inches (mm) 77.65 (1972.29) 78.45 (1992.71) 0.8 (20.42) 1%: Sidewall Height inches (mm) 3.86 (98) 3.99 (101.25) 0.13 (3.25) 3.3%: Revolutions per mile (km) 815.98 (507.02) 807.61 (501. Better Fuel Economy Factory Ratios Increased Power. vs 225/50-17 vs 225/45-17 vs 235/45-17 vs 275/40-17 vs 255/45-17 vs 255/40-17. 275/40-R17 tires are 0.02 inches (0.5 mm) smaller in diameter than 245/45-R17 tires and the speedometer difference is 0.1%. Visually, the differences are subtle. The 225/45R17 will appear slightly “stretched” with its extra 4.7% sidewall height compared to the 215/45R17. Trucks and SUVs often suit this subtly taller sidewall aesthetic. Handling & Stability 10th: 2014 ACE Summer Tyre Test (225/45 R17) 2013 Tyre Tests; 4th: 2013 Auto Express Summer Tyre Test (225/45 R17) 6th: 2013 European Summer Sports Tyre Test (225/45 R17) 6th: 2013 Sport Auto Max Performance Summer Tyre Test (225/40 R18) 2012 Tyre Tests; 3rd: 2012 Autobild 50 Tyre Braking Test (225/45 R17) 3rd: 2012 Auto Bild Max Performance 215/50-R17 tires are 0.51 inches (12.9 mm) smaller in diameter than 225/45-R18 tires and the speedometer difference is 2.0%. 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 .

245 40 r17 vs 225 45 r17