177Best 145/70 R12 tires
1 rated tire available in this size, scored on dry, wet, snow, comfort and wear. Top overall right now is the Petlas Elegant PT311 at 77/100.
20″
overall diameter
5.7″
section width
12″
rim diameter
1008.8
revs per mile
Best 145/70 R12 summer tires
1177Conversion
145/70 R12 in inches
| Overall diameter | 20″ |
| Section width | 5.7″ |
| Rim diameter | 12″ |
| Sidewall height | 102 mm |
| Circumference | 62.8″ |
| Revolutions per mile | 1008.8 |
Wheels
What rims fit 145/70 R12 tires?
A tire fits a range of rim widths. Too narrow or too wide and the sidewall changes shape.
Minimum
4″
Ideal
4.5″
Maximum
5″
Rim diameter is fixed at 12″ — only the width varies. Estimated from the 5.7″ section width (70–90% rule).
Fitted from the factory on rims: 12x3.5, 12x4, 12x4.5.
Sidewall
145/70 R12 — what does it mean?
| Parameter | Meaning |
|---|---|
| 145 | The first number is the section width — 145 mm, or about 5.7 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 102 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. |