The tyres in size 245/65 R17 are designed for use in the SUV cars, characterized by the high performance, 4x4 and off-road cars. The number 245 in the first position is the exact tyre's tread width in millimetres. The next number is the tyre's profile height in percentage which amounts 65% out of 245 millimetres of the tyre's tread width. The "R" denotes the radial construction of the tyre. Number 17 at the end of the size is the diameter of the wheel's rim in inches on which 245/65 R17 tyre can be installed. You're welcome to do the shopping!