What Causes Car Vibration at High Speeds?
2 Answers
High-speed car vibration can be caused by: 1. Incorrect front wheel alignment angles or excessive toe-in; 2. Low tire pressure or imbalance due to tire repairs; 3. Tire deformation or unequal number of tire bolts; 4. Loose installation of transmission system components; 5. Bent drive shaft, dynamic imbalance, or front axle deformation; 6. Failed shock absorbers, inconsistent stiffness of front leaf springs, or frame deformation. A car wheel is an assembly consisting of a tire and rim, but due to manufacturing factors, the mass distribution of this assembly isn't perfectly uniform. This creates dynamic imbalance when the wheel rotates at high speeds, causing noticeable steering wheel vibration that drivers can feel.
Body shaking at high speeds is quite annoying, and I think the most common cause is unbalanced tires. When I was driving, once the speed exceeded 90 km/h, I felt the steering wheel shaking violently. Later, I went to the shop for a check and found that the tires were not dynamically balanced—caused by accumulated mud on the rims and uneven tire wear. In addition, inconsistent tire pressure can also cause this, with one tire overinflated and another underinflated, leading to imbalance during high-speed rotation. It's best to regularly visit a professional shop for a four-wheel alignment and check the suspension springs and shock absorbers for any issues. If not addressed in time, prolonged shaking may accelerate brake disc wear and even affect control stability. In short, if you encounter this situation, slow down immediately and stop to check.
