Continental UltraContact is a summer tyre made in total of 80 sizes, ranging from R14 to R14 - this particular dimension is R16, which means it fits to a 16 inch/406.4mm diameter wheel. 185/50 R16 is 30mm wider than the narrowest dimension (155) and 10mm narrower than the widest one (195). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (185mm), which results in 92.5mm sidewall height. In 185/50 R16, there is only one possible speed index for Continental UltraContact - "H", which is good for speeds up to 210 km/h.