Compare two metric tire sizes for diameter, circumference, revolutions per mile and speedometer difference.
Use the connected calculators in this build for related estimates without starting over.
Enter the requested values above and select Calculate. Change any input to compare scenarios.
Compare 225/65R17 with 235/60R18 to see the diameter difference and approximate indicated-versus-actual speed change.
A tire that physically fits may still be unsuitable because of load rating, wheel width, suspension clearance, gearing, ABS/traction-control behavior or manufacturer restrictions.
Compare two metric tire sizes for diameter, circumference, revolutions per mile and speedometer difference.
Sidewall height = tire width × aspect ratio. Diameter = rim diameter + 2 × sidewall height, after converting millimeters to inches.
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