185/45 R15 tires diameter is 21.6 inches, section width is 7.3 inches and rim diameter is 15 inches. So the closest metric tire size of 185/45R15 existing size in inches is 28x9.0R15, which is 29.63% taller and 23.29% wider.
Compare 185/45 R15 vs 28x9.0R15 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 185/45 R15 tires:
Rim diameter x rim width
| Parameter | Meaning |
|---|---|
| 185 | The first number shows that the tire has a width of 185 millimeters or approximately 7.3 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 ~ 84mm |
| R15 | 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 15 inch wheels |