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315/40R18 Tires

315/40R18 tires have a diameter of 27.9", a section width of 12.4", and a wheel diameter of 18". The circumference is 87.7" and they have 723 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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315/40R18 Tire Front
12.4"
27.9"
315/40R18 Tire Side
18 Inch Wheel
Circumference
87.7"
18"
5.0"
723 Revs/Mile
315/40R18
Diameter : 27.9"
Width : 12.4"
Wheel : 18" x 10.5-12.5"
Sidewall : 5.0"
Circum. : 87.7"
Revs/Mile : 723

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

Nitto Tires
 Nitto NT555 G2 315/40R18
NT555 G2
Summer | (P)NA LL
Avg. $303.00
 Ultra High Performance  
Nitto Tires
 Nitto NT555RII 315/40R18
NT555RII
Street/Racetrack | (P)102W LL
Avg. $438.00
Hoosier Tires
 Hoosier R7 315/40R18
R7
Street/Racetrack | (P)102W LL
Avg. $555.00