Continental SportContact 6 is a summer tyre made in total of 196 sizes, ranging from R18 to R18 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (225mm), which results in 67.5mm sidewall height. In 225/30 R20, there is only one possible speed index for Continental SportContact 6 - "Y", which is good for speeds up to 300 km/h.