What to Expect in Your Spectrogram
Understanding the visualization that reveals wheel imbalances
Sample Spectrogram - Imbalanced Wheel
This shows what an imbalanced wheel pattern looks like
What to Look For
The Diagonal Line Pattern
An imbalanced wheel creates a distinctive diagonal line in the spectrogram that starts at the origin (bottom-left) and goes upward. This line represents the relationship between wheel speed and vibration intensity.
Why This Pattern Occurs
- Wheels turn faster as you go faster - creating vibrations at higher frequencies
- Vibrations get stronger with speed - imbalanced wheels shake more at highway speeds
- The line through origin - shows this direct relationship between speed and vibration
- Focus on higher speeds - vibrations usually only become noticeable above 40-50 km/h
What Colors Mean
- Dark blue/purple - Low vibration intensity (normal)
- Green/yellow - Moderate vibration intensity
- Bright yellow - High vibration intensity (potential imbalance)
Why Higher Speeds Matter
The visualization focuses on higher speeds because wheel imbalances typically don't produce noticeable vibrations below 40-50 km/h. For the most accurate diagnosis, measurements at highway speeds (70-150 km/h) are particularly valuable, as imbalance effects are amplified at these speeds. Lower speed measurements may show normal vibration levels even when an imbalance exists.
Interpreting Your Results
Balanced Wheels
Random, scattered vibrations with no clear diagonal pattern. Colors remain mostly blue/purple across all speeds.
Possible Imbalance
Clear diagonal line pattern with bright colors (yellow) indicating strong vibrations that increase with speed. Pay special attention to readings at higher speeds (above 40-50 km/h), as wheel imbalances are typically not noticeable at lower speeds.
Next Steps
If you see a strong diagonal pattern, consider having your wheels professionally balanced by a qualified mechanic.
Important Disclaimer
Qnut is a diagnostic tool that provides indicators only. Always consult with a qualified mechanic for professional diagnosis and repair. Many factors can cause vibrations in vehicles beyond wheel imbalance.