P345/30R18 — what does it mean?
- P means "passenger car"
- 345 stands for tread width in millimeters
- 30 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 P345 30R18 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, 30% of the 13.6″ will result in 4.1″ 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 26.2″ total tire diameter (or height).
For your convenience, below is a table for P345/30R18 conversion to inches:
|Overall diameter (height)||26.2″||665 mm|
|Tread width||13.6″||345 mm|
|Wheel diameter||18″||665 mm|
|Sidewall height||4.1″||104 mm|
|Revolutions||771 / ml||479 / km|
Alternatives to a P345/30R18 tire
If you're looking to upsize your P345 30R18 tires, try to stay within 3% deviation of an overall diameter for safety reasons.
|Tire||Tire diameter||Width||Wheel Size|