Hi there, Alexander!
Your situation with the Mazda5 is a problematic one and one that could prove hazardous if it's not diagnosed and fixed soon. The wobbling at low speeds and vibration at high speeds could have several potential causes. Here are some possibilities:
- Bent Wheel or Broken Tire Belt: A bent wheel or a break in the tire's internal belt can cause wobbling and vibration. This is more noticeable at certain speeds due to the dynamics of the tire rotation.
- Unbalanced Tires: Although you've had them rebalanced, it's possible that the issue wasn't fully resolved or another wheel is out of balance.
- Suspension or Steering Components: Worn lateral bushings, control arm bushings, or other steering/suspension parts could be contributing to the problem.
- Ply Separation: This is a condition where the layers within the tire start separating, leading to uneven tire surfaces and wobbling.
- Motor Mounts: Sometimes overlooked, worn motor mounts can cause vibrations that may be mistaken for tire or wheel issues.
Given the complexity, it's advisable to have a professional mechanic examine your vehicle. They can perform a more thorough inspection, perhaps checking each tire for 'ply separation' by slowly rotating them on a jack and looking for any 'blip' or shift in the tread. Also, ensuring that all lug nuts are correctly torqued is crucial for safety.
In your case, it turned out to be a warped tire on the passenger side rear. Replacing this tire resolved the issue, although a slight vibration at high speeds suggests an alignment might still be necessary.
Drive safe and feel free to reach out for any further advice!
Zack - Motor Verso Mechanics Team