135/80R12 — what does it mean?
- 135 stands for tread width in millimeters
- 80 is an aspect ration between the tread width and the sidewall in percents
- R means that the tire has a radial construction
- 12 is a wheel diameter (or rim) in inches
How to convert 135 80R12 to inches?
First of all, we need to divide 135 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 5.3″. Then, 80% of the 5.3″ will result in 4.3″ sidewall.
To get the total height or tire diameter, we need to sum the 12″ rim diameter with two of the sidewall heights. It will result in a 20.6″ total tire diameter (or height).
For your convenience, below is a table for 135/80R12 conversion to inches:
| Inches | Metric | |
|---|---|---|
| Overall diameter (height) | 20.6″ | 523 mm |
| Tread width | 5.3″ | 135 mm |
| Wheel diameter | 12″ | 523 mm |
| Sidewall height | 4.3″ | 108 mm |
| Circumference | 64.7″ | 1642 mm |
| Revolutions | 980 / ml | 609 / km |
Alternatives to a 135/80R12 tire
If you're looking to upsize your 135 80R12 tires, try to stay within 3% deviation of an overall diameter for safety reasons.
| Tire | Tire diameter | Width | Wheel Size |
|---|---|---|---|
| 145/70R12 | 20″ -0.73% | 5.7″ | 12″ |
| 145/80R12 | 21.2″ 0.71% | 5.7″ | 12″ |
| 155/70R12 | 20.6″ 0% | 6.1″ | 12″ |
| 165/70R12 | 21.2″ 0.71% | 6.5″ | 12″ |
| P145/80R12 | 21.2″ 0.71% | 5.7″ | 12″ |