Royal Black Royal Explorer 245/40 R17

Royal Black Royal Explorer is a tyre made in total of 11 sizes, ranging from R17 to R17 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 245/40 R17 is 40mm wider than the narrowest dimension (205) and 40mm narrower than the widest one (285). 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.