Performed by professional mechanics, a "dyno" test places the vehicle on rollers, allowing it to "drive" at high speeds while stationary. The technician records the dashboard speed versus the actual wheel rotation speed to identify discrepancies.
If a driver receives a speed-related ticket, a calibration report can prove the speedometer was inaccurate, often required to prove the exact speed in court. speedometer test
Installing tires with a different rolling diameter (e.g., larger or smaller) directly affects speedometer calibration. Performed by professional mechanics, a "dyno" test places