Sumitomo Bc100 245/40 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. 245/40 R17 is 100mm wider than the narrowest dimension (145) and 10mm narrower than the widest one (255). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (245mm), which results in 98mm sidewall height.