Continental ContiWinterContact TS 850P is a winter tyre made in total of 0 sizes, ranging from R13 to R13 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 195/55 R20 is 195mm wider than the narrowest dimension () and -195mm narrower than the widest one (). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (195mm), which results in 107.25mm sidewall height.