The tyres in size 305/35 R20 are installed in cars of a sports character. Number 305 is a designation of the tyres tread width expressed in millimetres. The next number is expressed in percentage and it denotes the tyre's profile height (it amounts 35% out of 305 millimetres of the tyre's tread width). The "R" next to the last number in the size denotes the radial construction of the tyre. The number in the last position describes the diameter of the wheel's rim which can be installed with the tyre in the particular size. In this case it is 20 inches. You don't know which tyre in size 305/35 R20 to choose? The opinions next to the each tyre model will help you to choose the best product.