145/70 R12 tires diameter is 20 inches, section width is 5.7 inches and rim diameter is 12 inches.
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 145/70 R12 tires:
Rim diameter x rim width
| Parameter | Meaning |
|---|---|
| 145 | The first number shows that the tire has a width of 145 millimeters or approximately 5.7 inches. |
| 70 | The second number is the aspect ratio. In this case, it is 70%. It shows the height of the tire from the ground to rim edge, which is 70% of the width or ~ 102mm |
| R12 | 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 12 inch wheels |