TireSize Calculator - Tire & Wheel Plus Sizing. BETA. 0.78% too fast. 0.78% too fast. 205-50R17, 205-55R16 tire size comparison with Size calculator. Use our tire calculator to compare tire sizes based on tire diameter, radius, sidewall height, circumference, revs per mile and speedometer difference. Inthe tire comparison table above, you can see a detailed calculation of the size difference between 205/65 R16 and 215/60 R16 tire. The calculation results are presented in the form of visual infographics, on which tire with size 205/65 R16 is on top, and tire with size 215/60 R16 below. Both in the table and in the graph, the tires are Inthe tire comparison table above, you can see a detailed calculation of the size difference between 205/50 R17 and 205/55 R16 tire. The calculation results are presented in the form of visual infographics, on which tire with size 205/50 R17 is on top, and tire with size 205/55 R16 below. Both in the table and in the graph, the tires are Compare205/60 R16 vs 215/45 R17. Tire Size and Comparison Calculator calculate tire diameter from code and compare speedometer differences for tire sizes. The first number 205 is the tire width in millimeters. The 2nd number 60 is used to calculate the sidewall height or "aspect ratio", by percentage. 20560 R16 doesn't belong to the most popular dimensions for winter tyres - there are 113 tyre models available, which can be compared to 205/50 R17, 245/45 R18, 245/40 R18. Let's break down the sizing - 60 is height of the tyre, which is calculated as 60% of the tyre width (205mm), which means the sidewall height has 123 mm. The wheel diameter 21560-R16 tires are 1.28 inches (32.5 mm) larger in diameter than 205/55-R16 tires and the speedometer difference is 4.9%. Thefirst number 195 is the tire width in millimeters. The 2nd number 60 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 195/60 R 15 tire is 60% of 195 = 192. The 3rd number 15 (generally preceded by an "R") is Rim Diameter in inches. This is the diameter of the rims bead seat base, not Simplyput, it is made up of a series of numbers. Let’s use 205/55 R16 as an example. The first value (in this example, 205) is the tyre width in millimeters. The second value (55) is the tyre profile in percentage. 50 60 65 70 75 80 16. 15 17 19 Diameter (mm) Speed difference (mph) 50: 100: 150: Difference between diameters: Alternative xvPhwp.