225/45-R15 tires are 0.89 inches (22.5 mm) smaller in diameter than 225/50-R15 tires and the speedometer difference is 3.7%.In the tire comparison table above, you can see a detailed calculation of the size difference between 225/65 R16 and 225/60 R16 tire. The calculation results are presented in the form of visual infographics, on which tire with size 225/65 R16 is on top, and tire with size 225/60 R16 below. Both in the table and in the graph, the tires are 225/75-R14 tires are 1.18 inches (30 mm) larger in diameter than 205/75-R14 tires and the speedometer difference is 4.3%. I see the following advantages of the 205/50/R17 vs 225/45/R17 for winter driving: 1. Narrower tire provide better traction in the snow/ice. 2. Taller sidewall on 205/50 (even if it is not much, it could be a hit or miss situation when you meet a pot hole). 3. Price - obviously smaller the tire size less expensive it is for the same brand/model. 205/55-R16 tires are 1.09 inches (27.8 mm) smaller in diameter than 225/45-R18 tires and the speedometer difference is 4.2%.
205/50-R16 tires are 0.79 inches (20 mm) smaller in diameter than 225/50-R16 tires and the speedometer difference is 3.1%.
The 205/55 tire has a diameter of 631.9 mm or 24.878 inches. The 225/50 tire has a diameter of 631.4 mm or 24.858 inches. That's close enough to call it even. However, the 205 tire has a width of 8.071 inches while the 225 tire has a width of 8.858 inches. That's about a 10% increase. Tires calculator. Our tire size calculator will help you estimate the difference of external dimensions of the wheels, height clearance, revolutions per mile and other characteristics, when installing tires of other sizes on your vehicle. This calculator allows you to tell the difference between the tires in inches, centimeters, and percentages. .