Continental WinterContact TS 870 P 285/40 R21

Continental WinterContact TS 870 P is a winter tyre made in total of 180 sizes, ranging from R16 to R16 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 285/40 R21 is 80mm wider than the narrowest dimension (205) and 40mm narrower than the widest one (325). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (285mm), which results in 114mm sidewall height.