Vredestein Ultrac Pro is a summer tyre made in total of 40 sizes, ranging from R18 to R18 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (225mm), which results in 123.75mm sidewall height. In 225/55 R17, 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.