Triangle EffeXWinter TW421 275/45 R21

Triangle EffeXWinter TW421 is a winter tyre made in total of 22 sizes, ranging from R13 to R13 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 275/45 R21 is 50mm wider than the narrowest dimension (225) and 0mm narrower than the widest one (275). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (275mm), which results in 123.75mm sidewall height.