Best 255/30 R18 Tires. Rims & Conversion Info

255/30 R18 in inches

255/30 R18 tires' overall diameter is 24 inches, tire width is 10 inches, the tire can be mounted on 18 inches wheel and the circumference is 75.4". With that parameters, we can calculate that it will take approximately 840.3 revolutions per mile.

So the closest metric tire size of 255/30R18 existing size in inches is 33x10.50R18, which is 37.5% taller and 5% wider.

You can use our handy tire size calculator to compare 255/30 R18 vs 33x10.50R18.

255/30 R18 – what does it mean?

Parameter Meaning
255 The first number shows that the tire has a section width of 255 mm or approximately 10 inches.
30 The second number is the aspect ratio or sidewall height. In this case, it is 30%. It shows the height of the tire from the ground to the rim edge or the height of the tire's cross-section which is 30% of the width or ~ 77mm
R18 The letter R means this tire is radial. Most of all tires nowadays are radial. The number is the tire diameter in inches. It means that the tire will fit 18-inch wheels

If you want to know more about how to decipher information inscribed on your tires, including aspects such as the tire height, tire width, and the diameter of the wheel, this guide provides an in-depth look at how to read a tire sidewall. These measurements can reveal a wealth of information about your tire's specifications and suitability for your vehicle. Mastering these details will allow you to make informed decisions when buying or replacing your tires.