205/40 R17 tyres are installed in sports cars. The size of the tyre can be seen on its sidewall. It comprises of a string of numbers and a letter which denotes the tyre's type of construction ("R" - radial). The first number informs about the tread width of the tyre and it is provided in millimetres. The second number equals the tyre profile's height and its percentage ratio to the tyre's tread width. In the case of the 205/40 R17 tyres it equals 40% out of 205 mm. The last number constitutes the diameter of the wheel rim (provided in inches) on which the tyre should be installed. See our broad selection of the 205/40 R17 tyre model in our offer.