Vibration Analysis - Tire and Wheel: Notes
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Refer to Work Stall Test Warning .
Wheel imbalance causes most highway speed vibration problems. A vibration can remain after dynamic balancing because:
- A tire is out of round (2).
- A rim is out of round (4).
- A tire stiffness variation exists (3).
Measuring tire and wheel free runout will uncover only part of the problem. All 3 causes, known as loaded radial runout (1), must be checked using a method of substituting known good tire and wheel assemblies on the problem vehicle.
Low-speed variations, which occur below 64 km/h (40 mph), are usually caused by runout. High-speed vibrations, which occur above 64 km/h (40 mph), can be caused by either imbalance or runout.