Speedometer Error & Tire Size Calculator

See how your real speed and odometer change when you change tire size.

Stock tire (e.g. 215/60R16)

Width (mm)

Aspect (%)

Wheel (in)

New tire

Width (mm)

Aspect (%)

Wheel (in)

Stock diameter

26.16 in

New diameter

26.74 in

Speedo error

+2.24%

Actual speed at 60 mph indicated

61.35 mph

Odometer drift

+2.24% (reads MORE miles than actual)

Minor offset, within typical OEM tolerance for production cars.

Diameter = 2 × sidewall (mm / 25.4) + wheel diameter. Negative % means new tire is smaller — actual speed is lower than indicated.

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Enter stock and new tire sizes (width, aspect ratio, wheel diameter). Get the speedometer error %, the actual speed at 60 mph indicated, and the odometer discrepancy over a year. Targets the r/cars, r/Truck, r/4x4, and r/Subaru recurring 'will my speedometer be off' question when changing tire size.

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