Continental ContiTour is a summer tyre made in total of 12 sizes, ranging from R15 to R15 - this particular dimension is R16, which means it fits to a 16 inch/406.4mm diameter wheel. 180/65 R16 is 50mm wider than the narrowest dimension (130) and -100mm narrower than the widest one (80). This tyre profile of 65 means the sidewall height of the tyre is 65% of the tyre width (180mm), which results in 117mm sidewall height. In 180/65 R16, there is only one possible speed index for Continental ContiTour - "H", which is good for speeds up to 210 km/h.