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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 672.
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"
672 Revs/Mile
315/40R21
Diameter : 30.9"
Width : 12.4"
Wheel : 21"
Sidewall : 5.0"
Circum. : 97.1"
Revs/Mile : 672

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. $317.70
 Touring 
$60 REBATE
Pirelli Tires
Pirelli P Zero 315/40R21
P Zero
Summer | 111Y SL
Avg. $408.13
 Supreme Performance 
$60 REBATE
Pirelli Tires
Pirelli Scorpion Winter 315/40R21
Scorpion Winter
Truck/SUV Winter | 111V SL
Avg. $449.00
 Performance