Continental ContiWinterContact TS 830P SUV 305/40 R20

Continental ContiWinterContact TS 830P SUV is a winter tyre made in total of 26 sizes, ranging from R17 to R17 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 305/40 R20 is 80mm wider than the narrowest dimension (225) and 0mm narrower than the widest one (305). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (305mm), which results in 122mm sidewall height.