125/60R18 — what does it mean?
- 125 stands for tread width in millimeters
- 60 is an aspect ration between the tread width and the sidewall in percents
- R means that the tire has a radial construction
- 18 is a wheel diameter (or rim) in inches
How to convert 125 60R18 to inches?
First of all, we need to divide 125 mm (width) by 25.4 (mm to inch conversion), which will give us a width of 4.9″. Then, 60% of the 4.9″ will result in 3″ sidewall.
To get the total height or tire diameter, we need to sum the 18″ rim diameter with two of the sidewall heights. It will result in a 24″ total tire diameter (or height).
For your convenience, below is a table for 125/60R18 conversion to inches:
| Inches | Metric | |
|---|---|---|
| Overall diameter (height) | 24″ | 610 mm |
| Tread width | 4.9″ | 125 mm |
| Wheel diameter | 18″ | 610 mm |
| Sidewall height | 3″ | 75 mm |
| Circumference | 75.4″ | 1915 mm |
| Revolutions | 840 / ml | 522 / km |
Alternatives to a 125/60R18 tire
If you're looking to upsize your 125 60R18 tires, try to stay within 3% deviation of an overall diameter for safety reasons.
| Tire | Tire diameter | Width | Wheel Size |
|---|---|---|---|
| 135/60R18 | 24.4″ 0.41% | 5.3″ | 18″ |
| 175/45R18 | 24.2″ 0.2% | 6.9″ | 18″ |
| 195/35R18 | 23.4″ -0.66% | 7.7″ | 18″ |
| 205/35R18 | 23.6″ -0.45% | 8.1″ | 18″ |
| 205/40R18 | 24.4″ 0.41% | 8.1″ | 18″ |
| 215/35R18 | 24″ 0% | 8.5″ | 18″ |
| 225/30R18 | 23.4″ -0.66% | 8.9″ | 18″ |
| 225/35R18 | 24.2″ 0.2% | 8.9″ | 18″ |
| 235/30R18 | 23.6″ -0.45% | 9.3″ | 18″ |
| 235/35R18 | 24.4″ 0.41% | 9.3″ | 18″ |