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305/40R21 Tires

305/40R21 tires have a diameter of 30.6", a section width of 12.0", and a wheel diameter of 21". The circumference is 96.1" and they have 659 revolutions per mile.
Specs may vary by manufacturer. learn more
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305/40R21 Tire Front
12.0"
30.6"
305/40R21 Tire Side
21 Inch Wheel
Circumference
96.1"
21"
4.8"
659 Revs/Mile
305/40R21
Diameter : 30.6"
Width : 12.0"
Wheel : 21"
Sidewall : 4.8"
Circum. : 96.1"
Revs/Mile : 659

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

Michelin Tires
Michelin Pilot Alpin 5 SUV 305/40R21
Pilot Alpin 5 SUV
Truck/SUV Winter | 113V XL
Avg. $531.00
 Performance  
30K Miles
Pirelli Tires
Pirelli Scorpion Winter 2 305/40R21
Scorpion Winter 2
Truck/SUV Winter | 113V XL
Avg. $575.00
 Performance