In the tire comparison table above, you can see a detailed calculation of the size difference between 215/60 R16 and 225/50 R17 tire. The calculation results are presented in the form of visual infographics, on which tire with size 215/60 R16 is on top, and tire with size 225/50 R17 below. Both in the table and in the graph, the tires are In the tire comparison table above, you can see a detailed calculation of the size difference between 225/60 R17 and 215/70 R16 tire. The calculation results are presented in the form of visual infographics, on which tire with size 225/60 R17 is on top, and tire with size 215/70 R16 below. Both in the table and in the graph, the tires are No, its better to change to R15 205/60. R16 205/60 is having a Difference in circumference of 4.97%. With R15 205/60, it is 0.89%. In general, 2% is only permissible. If you want to go to R16, then go for R16 205/55, it is 1.67%. The 205/55R16 tire has the following features: the first three digits 205 refer to the width of the tire in millimetres. The second two-digit number 55 refers to the ratio between the height of the sidewall and the width of the tire. R stands for “Radial” and the last two figures 16 indicate the wheel diameter in inches. Also, the online application calculates the difference in real speed and speedometer readings if the difference between tire 205/60 R16 and tire 215/55 R18 is significant. Calculate the difference in inches. If you want to compare other tire sizes, then select their sizes in the drop-down fields and click on the green button. 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. Also, the online application calculates the difference in real speed and speedometer readings if the difference between tire 205/55 R16 and tire 205/65 R16 is significant. The first number 215 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 215/60 R 16 tire is 60% of 215 = 192. The 3rd number 16 (generally preceded by an "R") is Rim Diameter in inches. The 2nd number 60 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 225/60 R 16 tire is 60% of 225 = 192. The 3rd number 16 (generally preceded by an "R") is Rim Diameter in inches. This is the diameter of the rims bead seat base, not the diameter of the outer rim edge. LJIaYo1.