Continental ContiSportContact 5 is a summer tyre made in total of 142 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/35 R18 is 30mm wider than the narrowest dimension (195) and 70mm narrower than the widest one (295). This tyre profile of 35 means the sidewall height of the tyre is 35% of the tyre width (225mm), which results in 78.75mm sidewall height. In 225/35 R18, there is only one possible speed index for Continental ContiSportContact 5 - "W", which is good for speeds up to 270 km/h.
