An instrument which measures and registers the number of kilometers or miles a vehicle travels. In automobiles, it is usually located in the same housing as the speedometer . Bicycles do not generally come with odometers as standard equipment. Motorcycles usually have the odometer in an instrument housing along with the speedometer for measuring and registering the miles and tenths of a mile (or kilometers and tenths of a kilometer) that the vehicle is driven. Some cars and motorcycles also have an additional trip odometer that can be reset to zero for conveniently measuring the miles or kilometers driven during trips or between fuel fillups. Also see trip odometer .