Triangle EffeXWinter TW421 275/40 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. 275/40 R20 is 50mm wider than the narrowest dimension (225) and 0mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (275mm), which results in 110mm sidewall height.