Sumitomo Bc100 215/55 R17

Sumitomo Bc100 is a tyre made in total of 137 sizes, ranging from R13 to R13 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 215/55 R17 is 70mm wider than the narrowest dimension (145) and 40mm narrower than the widest one (255). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (215mm), which results in 118.25mm sidewall height.