Sumitomo HTR Z5 is a summer tyre made in total of 30 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/40 R18 is 30mm wider than the narrowest dimension (205) and 40mm narrower than the widest one (275). 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. In
235/40 R18, HTR Z5 usually competes against
Ventus S1 evo3 K127, which is a tyre from
Hankook with a rating of 81%, compared to 38% of the
Sumitomo in question.
