Handling and maintenance of wheels in the car. Wheel service and maintenance. Wheel service comes down to checking the condition of the rims and wheel discs and their fastening, and then to replenish and replace grease in wheel hubs and adjust their bearings (the latter steps are given in the last chapter of the book). The maintenance of rims and discs is to remove traces of rust, improving the anti-corrosion coating and removing the traces of impacts (dents on the disc or rim). The smoothness of the rim is especially important with tubeless tires. From time to time, the wheels should be balanced on the wheel balancer. If a wheel runout is found, weights are placed on the outer edge of the wheel disc.