Why Is My Car Vibrating? Tires and Wheel Balancing
A steering wheel or seat that vibrates at highway speed is a common complaint. This overview covers the tire related causes and what wheel balancing does.
Vibration that appears or worsens at highway speed is one of the most common tire related complaints. Several causes are possible, and a qualified technician can isolate the source. The overview below explains the most frequent tire and wheel causes using standard industry terminology.
What Wheel Balancing Is
A tire and wheel assembly is almost never perfectly even in weight distribution. Balancing places small counterweights on the rim so the assembly spins smoothly at speed. When balance is off, the assembly can vibrate, and the sensation often grows stronger as speed increases.
Common Tire and Wheel Causes
- Lost or shifted balance weights. Weights can fall off over time, which leaves the assembly out of balance.
- Uneven tread wear. Cupped or flat spotted tread can create a repeating vibration.
- A bent rim. Impact with a pothole or curb can bend a rim enough to cause runout.
- A cold weather flat spot. Some tires develop a temporary flat spot after sitting in the cold. It often eases as the tire warms up.
- Separated internal structure. A tire with internal damage can vibrate even when balanced and should be inspected.
Where the Vibration Is Felt
As a general rule, a vibration felt mainly through the steering wheel often points to the front assemblies, while a vibration felt through the seat can point to the rear. This is only a starting point, since a technician uses measurement equipment to confirm the source.
If a new vibration appears, have the tires and wheels inspected by a qualified technician. Diagnosing vibration early can prevent uneven wear and protect related suspension parts.