Petlas Imperium PT515 is a summer tyre made in total of 11 sizes, ranging from R15 to R15 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 225/55 R17 is 40mm wider than the narrowest dimension (185) and -10mm narrower than the widest one (215). 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, Imperium PT515 usually competes against MP47 Hectorra 3, which is a tyre from Matador with a rating of 44%, compared to 48% of the Petlas in question.