Apart from tyre size, there is more information about the tyre given on the sidewall. At the end of the size there will be a letter, in this case , the highlighted red "W". This is the Speed Rating indication
For example, a Speed Rating of “W” indicates that it can be used at speeds of the car at 168 miles per hour or 270 kilometres per hour. The maximum speed for the tyre is found by looking at the Speed Rating letter and then looking this up in the table below.
The Speed Rating is typically found right after the Load Index, following the tyre size.