What Causes Steering Wheel Shaking at 120 km/h?
2 Answers
Here are the specific reasons for steering wheel shaking when braking at 120 km/h: 1. Wheel balancing issue: A car's wheel consists of a tire and a rim. When there's a problem with the wheel's dynamic balance, it means the wheel isn't in a balanced state during high-speed driving. If the dynamic balance data is incorrect, the wheel's rotation center will shift, causing the wheel to vibrate, which then transmits to the steering wheel. 2. Rim problem: If the car's rim has been impacted during previous driving, causing deformation. Due to the deformed rim, the wheel may vibrate during driving, leading to steering wheel shaking. 3. Chassis component issue: This usually occurs in vehicles with poor post-accident repairs. The impact from an accident can affect chassis components, which may also cause steering wheel shaking.
Having driven for over twenty years, steering wheel vibration at 120 km/h is particularly common, usually caused by tire imbalance. When the wheels rotate, uneven weight distribution leads to shaking, much like an unbalanced washing machine during spin cycle, transmitting the vibration to the steering wheel and making driving unstable. Additionally, severe tire wear or wheel hub deformation after hitting potholes can also cause issues at specific speed points, such as 120 km/h being the resonant frequency. Aging or damaged suspension components, like shock absorbers, can amplify the vibration sensation. Failing to address it promptly not only increases tire wear and fuel consumption but also poses significant safety risks. I recommend regular checks on tire balance and condition, especially before long-distance trips. A wheel balancing service costs little but can save a lot of hassle and effort.
