Spare part
![A spare tire mounted at the rear of a Mitsubishi Type 73 Light Truck as an example of a consumable spare part.](/Images/godic/202502/07/Mitsubishi_Type_73_Light_Truck_rear3155.jpg")
A spare part, spare, service part, repair part, or replacement part, is an interchangeable part that is kept in an inventory and used for the repair or replacement of failed units. Spare parts are an important feature of logistics engineering and supply chain management, often comprising dedicated spare parts management systems.