What type of material is sometimes used for balancing tires during installation?

Fine grain or liquid material is used for balancing tires during installation because it provides a uniform distribution of weight around the tire and wheel assembly. This type of material can flow and settle in the tire, ensuring that it finds the optimal position to balance any heavy spots effectively as the tire rotates. It is particularly beneficial in tire applications where traditional weights may not be suitable due to aesthetic concerns or the desire for a more dynamic form of balance.

Other methods like solid weights or adhesive strips can indeed be used for balancing, but they do not offer the same adaptive balancing capabilities as fine grain or liquid materials. Foam inserts are typically used for different applications, such as run-flat capabilities or improving ride comfort, rather than for balancing tires.