Triangle EffeXWinter TW421 235/55 R20

Triangle EffeXWinter TW421 is a winter tyre made in total of 22 sizes, ranging from R13 to R13 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 235/55 R20 is 10mm wider than the narrowest dimension (225) and 40mm narrower than the widest one (275). 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.