Goform GH18 235/55 R20

Goform GH18 is a summer tyre made in total of 9 sizes, ranging from R17 to R17 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 235/55 R20 is 30mm wider than the narrowest dimension (205) and 20mm narrower than the widest one (255). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (235mm), which results in 129.25mm sidewall height.