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. 245/45 R18 is 20mm wider than the narrowest dimension (225) and 110mm narrower than the widest one (355). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (245mm), which results in 110.25mm sidewall height. In 245/45 R18, there is only one possible speed index for Vredestein Ultrac Vorti - "Y", which is good for speeds up to 300 km/h. In 245/45 R18, Ultrac Vorti usually competes against Victra Sport 5, which is a tyre from Maxxis with a rating of 74%, compared to 60% of the Vredestein in question. Latest test in 245/45 R18 was held by Autobild in 2017, where Ultrac Vorti received rating "Exemplary" and finished on the 3. place. It was tested on a .