Every vehicle in the coverage is fitted with a metric-sized fiberglass or steel belted radial tires. Fitting tires of different sizes and kinds could have some influence on the ride and handling of the automobile. Using a combination of tires of various types (radial tires and tires with a bias belt) on the same car may have a severe effect on handling. People are advised to change tires in pairs, that is, in the same axle; when replacing a single tire, it is advisable to make sure that it matches in its size, structure, and tread pattern with the rest. Tire pressure has a considerable impact on the handling and wear and thus should be checked at least once a month or prior to long journeys. In case they are bent, dented, or leaking air, have large bolt holes, are severely rusted, out of vertical symmetry or the lug nuts do not tighten, these are to be replaced. Welding or peering are not to be repaired. Balancing tires and wheels plays a vital role in the general handling, braking, and performance. Lack of balance may have adverse effects on handling and ride quality, as well as, tire life and therefore, when a tire is fitted on a wheel it must be balanced in a shop using the required tools.