Continental Contiwintercontact Ts830P is a tyre made in total of 16 sizes, ranging from R16 to R16 - this particular dimension is R16, which means it fits to a 16 inch/406.4mm diameter wheel. 225/55 R16 is 30mm wider than the narrowest dimension (195) and 50mm narrower than the widest one (275). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (225mm), which results in 123.75mm sidewall height. In 225/55 R16, there is only one possible speed index for Continental Contiwintercontact Ts830P - "H", which is good for speeds up to 210 km/h.