Continental PremiumContact 6 is a summer tyre made in total of 261 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/55 R18 is 50mm wider than the narrowest dimension (185) and 90mm narrower than the widest one (325). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (235mm), which results in 129.25mm sidewall height. In 235/55 R18, there are 3 possible speed indexes for Continental PremiumContact 6 - "H","V","W", which are good for speeds up to 210, 240, 270 km/h.
