Thedifference in sizes and parameters between the 225/40 R18 tire and 205/40 R18 tire. Detailed calculations and graphics. Tire calculator online . Top comparisons; 225/45 R18: 215/45 R17: Sizes often compared to the 205/40 R18 tire: 205/55 R16: 195/55 R16: 185/60 R15: 185/65 R15: 22545/R18 vs 225/40/R18. Reply OP Posts Only. OP Posts Only. Reply From a quick google it appears that MG recommend 225/40/R18 for winter tyres. pmanson. Original Poster. 13,367 posts. 249 months Thecalculation results are presented in the form of visual infographics, on which tire with size 215/40 R18 is on top, and tire with size 225/45 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. 22540 R18 doesn't belong to the most popular dimensions for summer tyres - there are 108 tyre models available, which can be compared to 215/65 R16, 225/45 R17, 195/55 R16. Sizedifference between 235/45 R18 and 225/50 R18 tires. In the tire comparison table above, you can see a detailed calculation of the size difference between 235/45 R18 and 225/50 R18 tire. 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 225/50 R18 below. Tiresize comparison 215/40 R18 vs 225/40 R18 Calculate CM INCHES If your speedometer reads: Real speed is: Size difference between 215/40 R18 and 225/40 R18 tires. In the Sizedifference between 235/45 R18 and 245/40 R18 tires. In the tire comparison table above, you can see a detailed calculation of the size difference between 235/45 R18 and 245/40 R18 tire. 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. Inthe tire comparison table above, you can see a detailed calculation of the size difference between 225/40 R18 and 235/40 R18 tire. The calculation results are presented in the form of visual infographics, on which tire with size 225/40 R18 is on top, and tire with size 235/40 R18 below. Both in the table and in the graph, the tires are hbfjjGA.