Vredestein Ultrac Pro is a summer tyre made in total of 40 sizes, ranging from R18 to R18 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (225mm), which results in 101.25mm sidewall height. In 225/45 R18, there is only one possible speed index for Vredestein Ultrac Pro - "Y", which is good for speeds up to 300 km/h. In 225/45 R18, Ultrac Pro usually competes against Pilot Sport 5, which is a tyre from Michelin with a rating of 97%, compared to 87% of the Vredestein in question.