The tyres in size 255/40 R20 are designed for passenger cars of a sports character. Number 255 is a tyre's tread width in millimetres. The next number denotes tyre's profile height (which amounts 40% out of 255 millimetres of the tyre's tread width). The "R" in the size means that the tyre uses the radial construction in its built. The last number in the size is the diameter of the wheel's rim in inches on which the tyre in size 255/40 R20 can be installed. You don't know which tyre in size 255/40 R20 to choose? Look through our offer and database of the opinions and you will certainly find something for yourself.