245/45 R20 tires diameter is 28.7 inches, section width is 9.6 inches and rim diameter is 20 inches. So the closest metric tire size of 245/45R20 existing size in inches is 33x11.50R20, which is 14.98% taller and 19.79% wider.
Compare 245/45 R20 vs 33x11.50R20 with our handy tire size calculator.
For each tire size there often there are several wheel sizes. You can't put very wide tires on narrow rims or vise versa. Here is what size of the rims do you need for 245/45 R20 tires:
Rim diameter x rim width
|245||The first number shows that the tire has a width of 245 millimeters or approximately 9.6 inches.|
|45||The second number is the aspect ratio. In this case, it is 45%. It shows the height of the tire from the ground to rim edge, which is 45% of the width or ~ 111mm|
|R20||The letter R means this tire is radial. Most of all tires nowadays are radial. The number is the tire diameter in inches. It means that tire will fit 20 inch wheels|