I am having a vibration problem. It is mostly at highway speeds. especially over 60ph. Had a four wheel alignment and tires re-balanced twice with no improvement. New tires. The shop says that that the rims have a slight warp in them. Does this sound right? Have others had this problem?
Tire and wheel manufacturers continually develop new manufacturing methods to enhance the uniformity of their products because radial runout, lateral runout, force variation and imbalance can affect a vehicle's ride quality.
Match mounting tires on wheels is a process where a tire's installed position on the wheel is specifically selected to help minimize the final combination's force variation and/or imbalance. One match mounting procedure aligns the tire's measured high point of radial force variation with the measured low point of the wheel's radial runout. The other simply aligns the tire's lightest spot with the wheel's heaviest spot.
Original Equipment (OE) tire suppliers are required to mark the tire's "high point" while OE wheel manufacturers mark the wheel's "low point." This helps the vehicle manufacturer match mount combinations that maximize new car ride quality while reducing the amount of balancing weight.
Today, many vehicle manufacturers specify the use of a temporary tag applied to tires and wheels that are removed before the vehicle is put into service. Unfortunately, this means that there are no permanent marks to reference later.