BF Goodrich g-force Winter 235/40 R18

BF Goodrich g-force Winter is a winter tyre made in total of 27 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/40 R18 is 80mm wider than the narrowest dimension (155) and 10mm narrower than the widest one (245). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (235mm), which results in 94mm sidewall height.