At normal highway speeds, an average size tire rotates 850 times per minute. At this speed, slight variations in balance, sidewall stiffness or roundness can cause the wheel to literally slam into the pavement 14 times a second. The ultra-sensitive road feel of today's vehicles gives drivers a hands-on detection of vibration, a warning of potential problems. Unchecked, excessive wheel vibration can result in expensive damages and unsafe driving conditions such as:
• Excessive Tire Wear
• Damage to Suspension and Steering Components
• Unsafe Steering and Handling
What Causes Excessive Wheel Vibration?
Wheels Out of Balance
Static wheel balancing uses a single weight plane and only addresses "up-and-down" imbalance. This is simply not adequate for today's wheel vibration sensitive vehicles.
Dynamic wheel balancing uses two weight planes. This eliminates "up-and-down" and "side-to-side" imbalance. Dynamic, two plane wheel balance should always be requested, even on custom wheels when hidden weights are required.
Wheel Force Variation
Force variation
is most frequently due to wheel runout, uneven tread, or sidewall stiffness in the tire. Runout is when a tire or rim is out of round when rolling; frequent causes are a bent rim or uneven tire wear. Wheel force variation can be corrected by aligning the high point or stiff spot in the tire with the lowest spot in the rim. This will make the wheel "round when rolling." This procedure is called Force Matching and solves most vibration problems. Tires and rims with extreme runout or road force variation often cannot be matched an must be replaced to solve vibration problems
Tire Pressure, Wheel Alignment, Suspension and Steering Components
Improper tire pressure and/or misalignment causes irregular tire wear, which creates and amplifies imbalance, resulting in wheel vibration. Alignment can be adjusted and wheels serviced to reduce or stop the vibration. Steering and suspension components need periodic inspection. They can eventually wear out resulting in wheel vibration. Excessive wheel vibration from other causes can also shorten steering and suspension components.