The tyres in size 255/40 R18 are designed for passenger cars with higher engine power. Number 255 is the tyre's tread width (in millimetres). The next number is concerned with the tyre's profile height which amounts 40% out of 255 millimetres of the tyre's tread width. The "R" after these numbers means that the tyre uses in its built the radial construction. Number 18 at the end of the size describes the diameter of the wheel's rim in inches which can be installed with the tyre in size 255/40 R18. Check out our offer and find the equipment which will fit your car's character.