Hi there, Jessica!
Your situation sounds quite familiar to a lot of the problems that I've diagnosed and troubleshoot before, and there are a few potential causes for the steering wheel shaking at high speeds:
- Wheel Balancing: If the wheels are not properly balanced, it can cause vibration. Since you've recently got new wheels, it's worth getting them checked and rebalanced if necessary.
- Brake Rotor Issues: Despite the visual inspection, there might be issues with your brake rotors, like warping or run-out, which aren't easily visible. These can become more noticeable under braking.
- Tire Issues: Since you've mentioned installing winter tires, keep in mind that their deep treads can behave differently at high speeds. It's worth checking if they are properly aligned and balanced.
- Suspension Components: Less common, but issues with suspension components can also lead to such symptoms.
Since the shaking subsides at lower speeds, it's more likely related to wheel balance or tire issues. However, it's always good to rule out brake rotor problems, especially since the vibration intensifies while braking.
We recommend getting a wheel balance check as a first step. If the problem persists, a more detailed inspection of the brake rotors and suspension might be necessary. It's great that you're addressing this early, as prolonged driving with such issues can lead to more significant problems down the line.
Feel free to update us with your findings or if you have more questions :-)
Zack - Motor Verso Mechanics Team