Tire Size Calculator

Tire Size Calculator

Tire Size Calculator

Compare different tire sizes and see how they affect your vehicle

Original Tire

New Tire

Enter Your Current Tire Size

Tire Database Search

225/45R17
245/40R18
24.7″
25.7″

Results

Dimension Original New Difference
Tire Size 225/45R17 245/40R18
Diameter 24.7″ 25.7″ +1.0″ (+4.0%)
Width 8.9″ 9.6″ +0.7″ (+8.9%)
Circumference 77.6″ 80.7″ +3.1″ (+4.0%)
Sidewall Height 4.0″ 3.8″ -0.2″ (-5.0%)
Revolutions/Mile 815 785 -30 (-3.7%)
Effect Value Description
Speedometer -4.0% Your speedometer will read slower than actual speed
At 60 mph 62.4 mph Actual speed when speedometer shows 60 mph
Ground Clearance +0.5″ Change in distance from ground to chassis
Wheel Well Clearance -0.2″ Change in space between tire and wheel well
Wheel Poke +5mm How much the wheel sticks out from the fender

Fitment Notes

  • The new tire is 4.0% larger in diameter, which may affect speedometer accuracy.
  • The new tire is 8.9% wider, which may affect clearance in the wheel well.
  • The new wheel has a 5mm different offset, which will change the wheel position relative to the fender.
  • Always ensure proper clearance between the tire and suspension components, fenders, and wheel wells.
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