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Speedometer Calibration Tool
Calculate speedometer error when changing tire sizes or rims.
Original Tire
Stock configuration
New Tire
Modified configuration
Calibration Test
Speed check
Comparison Results
Variance Analysis
ORIGINAL DIAMETER
25.97"
NEW DIAMETER
26.72"
Diameter Difference
2.86%
Reality Check
When your gauge shows 60 MPH, your true speed is:
61.7 MPH