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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 they have 653 revolutions per mile.
Generally they are approved to be mounted on 10.5-12.5" wide wheels.
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" x 10.5-12.5"
Sidewall : 5.0"
Circum. : 97.1"
Revs/Mile : 653

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Michelin Tires
Michelin Primacy Tour A/S 315/40R21
Primacy Tour A/S
All Season | 111H SL
Avg. $307.50
 Grand Touring 
55K Miles
Continental Tires
Continental CrossContact LX Sport 315/40R21
CrossContact LX Sport
Truck/SUV All Season | 111H SL
Avg. $333.67
 Touring 
Pirelli Tires
Pirelli P Zero 315/40R21
P Zero
Summer | 111Y SL
Avg. $370.00
 Supreme Performance 
Pirelli Tires
Pirelli P Zero PZ4 315/40R21
P Zero PZ4
Summer | 111Y XL
Avg. $378.00
 Supreme Performance 
Pirelli Tires
Pirelli Scorpion Winter 315/40R21
Scorpion Winter
Truck/SUV Winter | 115V XL
Avg. $470.00
 Performance 
Pirelli Tires
Pirelli Scorpion Winter 315/40R21
Scorpion Winter
Truck/SUV Winter | 111V SL
Avg. $488.00
 Performance 
Pirelli Tires
Pirelli P Zero PZ4 315/40R21
P Zero PZ4
Summer | 115Y XL
Avg. $511.00
 Supreme Performance 
Pirelli Tires
Pirelli Scorpion Zero All Season Plus 315/40R21
Scorpion Zero All Season Plus
Truck/SUV All Season | 115Y XL
Avg. $703.00
 Sport 
50K Miles