Baihang - Development, customization, and production of motorcycle speedometers and PCB boards.
You know that feeling when you think you're going fast, but the speedometer shows something lower? Or cruising slowly, but it reads higher? You're not alone—many riders notice this. Here's why it happens and why it's usually not a big deal:
It's Often Intentional (The "Happy" Part): Many countries require speedometers to show equal to or higher than actual speed for safety. So, if it reads a bit high (say 3-10%), that's likely by design—not a fault.
Tire Size Matters: Changing tire size or wear affects the rolling radius, making speed readings inaccurate. This is the most common cause of real discrepancy.
Sensor or Calibration Issues: Less common, but a faulty speed sensor or calibration error after service can cause problems.
Bottom line: Don't panic. If the discrepancy is small and consistent, it's probably intentional. If it's large or sudden, check your tire size or have a mechanic look at it. For accurate speed, always trust your GPS.
Your Turn: Has your speedometer ever given you a surprise reading? Drop a comment!