Best 155/70 R12 tires
We don't have rated tires listed in this size yet — the conversion, rim fitment and comparisons below still apply.
20.5″
overall diameter
6.1″
section width
12″
rim diameter
981.7
revs per mile
Conversion
155/70 R12 in inches
| Overall diameter | 20.5″ |
| Section width | 6.1″ |
| Rim diameter | 12″ |
| Sidewall height | 109 mm |
| Circumference | 64.5″ |
| Revolutions per mile | 981.7 |
Wheels
What rims fit 155/70 R12 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
4.5″
Ideal
5″
Maximum
5.5″
Rim diameter is fixed at 12″ — only the width varies. Estimated from the 6.1″ section width (70–90% rule).
Fitted from the factory on rims: 12x4, 12x4.5.
Sidewall
155/70 R12 — what does it mean?
| Parameter | Meaning |
|---|---|
| 155 | The first number is the section width — 155 mm, or about 6.1 inches across the widest part of the tire. |
| 70 | The second number is the aspect ratio: sidewall height as a percentage of width. At 70%, the sidewall is about 109 mm tall. |
| R12 | R means radial construction, which nearly all modern tires use. The number is the rim diameter in inches — this tire fits a 12-inch wheel. |