What is the reason for still experiencing shaking at 120 km/h after performing wheel balancing several times?

[DeJuliana]

After performing wheel balancing, if the car still shakes at 120 km/h, the first thing to determine is whether the wheel balancing was done accurately, as there might be issues with the balancing process. There are numerous potential causes for vehicle shaking at high speeds. Problems with components such as tires, the drivetrain, or the vehicle's suspension can all lead to shaking. Below are specific reasons: 1. Tire pressure issues. Significant differences in tire pressure among the four tires, or tire pressure that is either too high or too low, can cause shaking. Large variations in tire pressure result in inconsistent energy absorption and shock absorption capabilities of the tires, leading to body shake at high speeds. Additionally, nails puncturing the tires can also cause shaking. 2. It could also be due to inaccurate four-wheel alignment, which can lead to vehicle shaking. In such cases, a four-wheel alignment needs to be redone. 3. There might also be issues with the engine. For example, aging engine mounts can cause vehicle shaking.