Vredestein Ultrac Vorti is a summer tyre made in total of 69 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 245/40 R18 is 20mm wider than the narrowest dimension (225) and 110mm narrower than the widest one (355). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (245mm), which results in 98mm sidewall height. In 245/40 R18, there is only one possible speed index for Vredestein Ultrac Vorti - "Y", which is good for speeds up to 300 km/h. In 245/40 R18, Ultrac Vorti usually competes against Sportnex AS-2+, which is a tyre from Nankang with a rating of 20%, compared to 0% of the Vredestein in question.
