The tyres in size 225/55 R18 are used in 4x4, SUV and sports cars. The first number in the tyre's size (225) is the exact tyre's tread width expressed in millimetres. The next number is the tyre's profile height which in this case amounts 55% out of 225 millimetres of the tyre's tread width. The "R" in the third position denotes the radial construction of the tyre. The last number is the diameter of the wheel's rim in inches which can be installed with the tyre in size 225/55 R18. Check out our offer of tyres in size 225/55 R18 and choose something for yourself.