345/55R15 — what does it mean?
- 345 stands for tread width in millimeters
- 55 is an aspect ration between the tread width and the sidewall in percents
- R means that the tire has a radial construction
- 15 is a wheel diameter (or rim) in inches
How to convert 345 55R15 to inches?
First of all, we need to divide 345 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 13.6″. Then, 55% of the 13.6″ will result in 7.5″ sidewall.
To get the total height or tire diameter, we need to sum the 15″ rim diameter with two of the sidewall heights. It will result in a 30″ total tire diameter (or height).
For your convenience, below is a table for 345/55R15 conversion to inches:
| Inches | Metric | |
|---|---|---|
| Overall diameter (height) | 30″ | 762 mm |
| Tread width | 13.6″ | 345 mm |
| Wheel diameter | 15″ | 762 mm |
| Sidewall height | 7.5″ | 190 mm |
| Circumference | 94.2″ | 2393 mm |
| Revolutions | 673 / ml | 418 / km |
Alternatives to a 345/55R15 tire
If you're looking to upsize your 345 55R15 tires, try to stay within 3% deviation of an overall diameter for safety reasons.
| Tire | Tire diameter | Width | Wheel Size |
|---|---|---|---|
| 265/75R15 | 30.6″ 0.49% | 10.4″ | 15″ |
| 265/70R15 | 29.6″ -0.33% | 10.4″ | 15″ |
| 255/75R15 | 30″ 0% | 10″ | 15″ |
| 245/75R15 | 29.4″ -0.5% | 9.6″ | 15″ |
| 205/90R15 | 29.6″ -0.33% | 8.1″ | 15″ |
| 215/85R15 | 29.4″ -0.5% | 8.5″ | 15″ |
| 225/80R15 | 29.2″ -0.66% | 8.9″ | 15″ |
| 235/80R15 | 29.8″ -0.16% | 9.3″ | 15″ |
| 275/70R15 | 30.2″ 0.16% | 10.8″ | 15″ |
| 285/70R15 | 30.8″ 0.65% | 11.2″ | 15″ |