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.
Over time, mechanical components inside the speedometer (like magnets or springs) can wear out, causing inaccuracies. 3. Key Factors Affecting Accuracy
