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315/40R21 Tires

315/40R21 tires have a diameter of 30.9", a section width of 12.4", and a wheel diameter of 21". The circumference is 97.1" and the revolutions per mile are 653.
Specs may vary by manufacturer. learn more
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315/40R21 Tire Front
12.4"
30.9"
315/40R21 Tire Side
21 Inch Wheel
Circumference
97.1"
21"
5.0"
653 Revs/Mile
315/40R21
Diameter : 30.9"
Width : 12.4"
Wheel : 21"
Sidewall : 5.0"
Circum. : 97.1"
Revs/Mile : 653

Upsizing Wheels or Tires?

When searching for the perfect tire for your vehicle you need options. Click the "Alternate Sizes" button to see a list of similar tire sizes. You can then change the wheel size to see alternate sizes on a different diameter wheel.
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Select a Size to Compare Prices on Available Tires

Continental Tires
 Continental CrossContact LX Sport 315/40R21
CrossContact LX Sport
Truck/SUV All Season | 111H SL
Avg. $319.27
Touring
$70 REBATE
Pirelli Tires
 Pirelli P Zero 315/40R21
P Zero
Summer | 111Y SL
Avg. $350.82
Supreme Performance
Pirelli Tires
 Pirelli Scorpion Winter 315/40R21
Scorpion Winter
Truck/SUV Winter | 111V SL
Avg. $468.15
Performance
$70 REBATE
Pirelli Tires
 Pirelli P Zero PZ4 315/40R21
P Zero PZ4
Summer | 115Y XL
Avg. $492.62
Supreme Performance
Pirelli Tires
 Pirelli Scorpion Winter 315/40R21
Scorpion Winter
Truck/SUV Winter | 115V XL
Avg. $504.16
Performance
Pirelli Tires
 Pirelli Scorpion Zero All Season Plus 315/40R21
Scorpion Zero All Season Plus
Truck/SUV All Season | 115Y XL
Avg. $678.62
Sport
50K Miles