Maxxis Victra Sport 5 is a summer tyre made in total of 73 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/45 R18 is 30mm wider than the narrowest dimension (205) and 60mm narrower than the widest one (295). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (235mm), which results in 105.75mm sidewall height. In 235/45 R18, there is only one possible speed index for Maxxis Victra Sport 5 - "Y", which is good for speeds up to 300 km/h. In 235/45 R18, Victra Sport 5 usually competes against Aspire XP, which is a tyre from Apollo with a rating of 58%, compared to 74% of the Maxxis in question.