Best 315/40 R21 Tires. Rims & Conversion Info

315/40 R21 in inches What rims fit 315/40 R21 tires What is 315/40 R21?

Best 315/40 R21 Summer Tires

Image of Pirelli P Zero PZ4
Pirelli P Zero PZ4
Overall: 68.1%
Dry: 88.5%
Wet: 82.5%
Comfort: 78.5%
Wear: 57.5%
Buy again: 71%
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Image of Toyo Proxes Sport
Toyo Proxes Sport
Overall: 66.9%
Dry: 68%
Wet: 73%
Comfort: 64%
Wear: 67%
Buy again: 60%
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Image of Pirelli P Zero
Pirelli P Zero
Overall: 60.3%
Dry: 83%
Wet: 72.5%
Comfort: 70.5%
Wear: 57%
Buy again: 56%
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Best 315/40 R21 Truck/SUV All-Season Tires

Image of Pirelli Scorpion Zero All Season Plus
Pirelli Scorpion Zero All Season Plus
Overall: 91%
Dry: 93%
Wet: 91%
Snow: 78%
Comfort: 92%
Wear: 87%
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Image of Pirelli Scorpion Zero All Season
Pirelli Scorpion Zero All Season
Overall: 65%
Dry: 78.3%
Wet: 65%
Snow: 70%
Comfort: 75%
Wear: 40%
Buy again: 70%
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Image of Continental CrossContact LX Sport
Continental CrossContact LX Sport
Overall: 40.9%
Dry: 71.2%
Wet: 72%
Snow: 49%
Comfort: 73%
Wear: 35%
Buy again: 10%
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Best 315/40 R21 Truck/SUV Summer Tires

Image of Michelin Pilot Sport 4 SUV
Michelin Pilot Sport 4 SUV
Overall: 80.1%
Dry: 83%
Wet: 86.5%
Comfort: 76.5%
Wear: 76%
Buy again: 72.5%
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Image of Michelin Latitude Sport 3
Michelin Latitude Sport 3
Overall: 77%
Dry: 91.5%
Wet: 87.5%
Comfort: 80.5%
Wear: 70%
Buy again: 81%
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Best 315/40 R21 Truck/SUV Winter Tires

Image of Pirelli Scorpion Winter
Pirelli Scorpion Winter
Overall: 83.3%
Dry: 83.7%
Wet: 86%
Snow: 84%
Comfort: 84%
Wear: 78.5%
Buy again: 80%
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Best 315/40 R21 Summer TiresBest 315/40 R21 Truck/SUV All-Season TiresBest 315/40 R21 Truck/SUV Summer TiresBest 315/40 R21 Truck/SUV Winter Tires

315/40 R21 in inches

315/40 R21 tires' overall diameter is 30.9 inches, tire width is 12.4 inches, the tire can be mounted on 21 inches wheel and the circumference is 97.1". With that parameters, we can calculate that it will take approximately 652.5 revolutions per mile.

What rims fit 315/40 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 315/40 R21 tires:

Rim diameter x rim width

315/40 R21 – what does it mean?

Parameter Meaning
315 The first number shows that the tire has a section width of 315 mm or approximately 12.4 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 ~ 126mm
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.