Best 325/40 R21 Tires. Rims & Conversion Info

325/40 R21 in inches What rims fit 325/40 R21 tires What is 325/40 R21?

Best 325/40 R21 Summer Tires

Image of Continental ContiSportContact 5P
Continental ContiSportContact 5P
Overall: 47%
Dry: 86%
Wet: 79%
Comfort: 76%
Wear: 53%
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Best 325/40 R21 Summer Tires

325/40 R21 in inches

325/40 R21 tires' overall diameter is 31.2 inches, tire width is 12.8 inches, the tire can be mounted on 21 inches wheel and the circumference is 98". With that parameters, we can calculate that it will take approximately 646.5 revolutions per mile.

What rims fit 325/40 R21 tires?

For each tire size there often there are several wheel sizes. You can't put too wide tires on narrow rims or vice versa. Here is what size of the wheels your vehicle needs for 325/40 R21 tires:

Rim diameter x rim width

325/40 R21 – what does it mean?

Parameter Meaning
325 The first number shows that the tire has a section width of 325 mm or approximately 12.8 inches.
40 The second number is the aspect ratio or sidewall height. In this case, it is 40%. 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 40% of the width or ~ 130mm
R21 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 21-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.