225/50-R18 tires are 0.53 inches (13.5 mm) larger in diameter than 235/45-R18 tires and the speedometer difference is 2.0%. 225/40 R18: £102.69 - £108.70 (2 Prices) Compare Prices >> 225/45 R17: £95.88 - £111.64 (10 Prices) Compare Prices >> 225/55 R17: £138.63 - £161.53 (8 Prices) Compare Prices >> 235/45 R17: £117.05 - £127.96 (5 Prices) Compare Prices >> Available in 47 tyre sizes - View all. The first number 225 is the tire width in millimeters. The 2nd number 55 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 225/55 R 18 tire is 60% of 225 = 192. The 3rd number 18 (generally preceded by an "R") is Rim Diameter in inches. 225/40 R18 Sport Auto 2023; 225/45 R17 Autoexpress 2023; 225/45 R18 Tyre Reviews 2023; 225/60 R18 Autobild 2023; 235/60 R18 Tyre Reviews 2023; 255/45 R20 Automotorsport 2023; 225/45 R17 ADAC 2023; 225/45 R18 Autobild 2023; 205/60 R16 ADAC 2023; 225/40 R18 Autobild 2023; 235/55 R18 ARBÖ 2023; 225/45 R18 Autobild 2023; 215/60 R16 ADAC 2022; 225/
225/40R18 Tires. 225/40R18 tires have a diameter of 25.1", a section width of 8.9", and a wheel diameter of 18". The circumference is 78.8" and they have 804 revolutions per mile. Generally they are approved to be mounted on 7.5-9" wide wheels. Specs may vary by manufacturer. learn more.
In the tire comparison table above, you can see a detailed calculation of the size difference between 225/45 R18 and 235/40 R18 tire. The calculation results are presented in the form of visual infographics, on which tire with size 225/45 R18 is on top, and tire with size 235/40 R18 below. Both in the table and in the graph, the tires are
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    • 225 45 r17 vs 225 40 r18