Continental PremiumContact 6 is a summer tyre made in total of 254 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/50 R18 is 50mm wider than the narrowest dimension (185) and 90mm narrower than the widest one (325). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (235mm), which results in 117.5mm sidewall height. In 235/50 R18, there are 3 possible speed indexes for Continental PremiumContact 6 - "V","H","Y", which are good for speeds up to 240, 210, 300 km/h. Latest test in 235/50 R18 was held by Autobild in 2017, where PremiumContact 6 received rating "Recommended" and finished on the 5. place. It was tested on a .