What is the difference between four-wheel dynamic balancing and four-wheel alignment?

[StAaron]

Four-wheel dynamic balancing and four-wheel alignment differ in their functions: dynamic balancing involves adding counterweights to each wheel to correct the balance of each edge part of the wheel under dynamic conditions; four-wheel alignment adjusts the data of all four wheels. Four-wheel dynamic balancing ensures that the wheel maintains a balanced state after rotation by adding counterweights under dynamic conditions. Four-wheel alignment is based on the four-wheel parameters of the vehicle, adjusting them to ensure good driving performance and a certain level of reliability.

[StevenDella]

When it comes to wheel balancing and wheel alignment, I think they are quite different, although both relate to wheel performance. Wheel balancing mainly solves the problem of vibration when the wheels rotate. For example, if your steering wheel shakes violently when driving on the highway, it's because the weight on the tires is uneven. Doing wheel balancing involves adding lead weights to the rims to balance the weight. On the other hand, wheel alignment is different. It adjusts various angles of the wheels, such as toe-in or camber, to ensure the car drives straight without pulling to one side, and also prevents uneven tire wear. I recently had wheel balancing done when I got new tires, while alignment is usually done when there's noticeable tire wear. Simply put, wheel balancing is about comfort, while alignment is about directional stability and tire lifespan. I recommend getting wheel balancing done every time you change tires, and checking alignment once a year. The cost is a few dozen yuan for wheel balancing and around one to two hundred yuan for alignment, but don't skimp on it—it has a big impact on driving safety.

[AveryFitz]

I often confused these two concepts when I first bought my car, but now I've got it clear. Wheel balancing is only for a single wheel, aiming to eliminate vibrations. Obvious shaking when you brake or accelerate is a signal. Wheel alignment, on the other hand, is an adjustment of the entire suspension system, with the goal of keeping all four wheels at the correct angles to avoid the car pulling to one side or rapid tire wear. For example, last time I went on a business trip on mountain roads and found the car pulling slightly to the left when I returned. An alignment fixed the issue. For daily city driving, balancing once a year is sufficient, and alignment every two years is more convenient. By the way, improper alignment can also damage suspension components, so it's recommended to go to a professional shop and not compromise safety for a cheaper price.

[StJulian]

Actually, the difference between wheel balancing and alignment is not hard to understand. The former deals with imbalance during wheel rotation, which can cause steering wheel vibration at high speeds; the latter adjusts the position and angle of the wheels to address drifting or uneven tire wear. Wheel balancing only requires machine testing and adding counterweights, taking about 10 minutes; alignment is more complex, involving angle measurement and fine-tuning suspension components, taking at least half an hour. I feel alignment is more critical for safety because it directly affects your straight-line driving stability. Incorrect alignment can damage tires over time and increase the risk of blowouts. Wheel balancing is more about ride comfort, preventing vibrations that can cause fatigue. Regular checks of both can save money and extend tire life.