Tyres in size 275/30 R21 are designed for cars of a sports character. The first number in the size (275) is a tyre's tread width expressed in millimetres. The next number denotes tyre's profile height which amounts 30% out of 275 millimetres of the tyre's tread width. The "R" next to the numbers means that tyre has been produced according to the radial construction. The last number is a designation of the diameter of the wheel's rim on which the tyre in size 275/30 R21 can be installed. This number is expressed in inches. To choose a perfect tyre for your car, look through our rich offer of tyres in size 275/30 R21.