What size tire is a 265/50 R20?
R20 tires have a diameter of 30. The sidewall of the tire is 5. Look for the number that follows the letter R in the sequence. For the tire size “P245/50R20 102V,” the wheel diameter is 20. This means that the tires need to fit 20-inch wheels.Taking the example of 275/30 R20 97Y, the number 275 indicates the tyre width in millimeters; 30 is the aspect ratio, the height-to-width ratio expressed as a percentage (30%); R stands for radial and specifies the construction of the carcass; and 20 is the rim diameter in inches.