Various bicycle tools have evolved over the years into specialized tools for working on a bicycle. Modern bicycle shops will stock a large number of tools for working on different bicycle parts. This work can be performed by a trained bicycle mechanic, or for simple tasks, by the bicycle owner. Various tools by function Hub, wheel and tire tools Tire levers are used for removing the tires from the rim, often for changing the inner tube. Plastic levers are more prone to breakage; metal ones damage tubes, tires, or rims more easily. Cone wrenches (spanners) are needed to dismantle and adjust the hub bearings. Spoke wrenches are used for tensioning the spokes of a wheel. Tensiometer or spoke tension meter is used to measure the tension in spokes. Tire bead jack can be used to install tires on rims, especially when the tire-rim combination is tight. Dishing gauge is used to measure the dish of a wheel. Wheel truing stand is used to measure the side to side and radial trueness of a wheel's rim and facilitate truing it. Bicycle pump Pressure gauge is used to measure tire pressure. Brake tools Cable and housing cutters Cable tensioning tool to hold the cables taut while being worked on. Third hand or 3rd hand to clamp brake pads against rim during adjustment. Rotor truing tool Headset tools A head tube facing and reaming tool is a hand tool used to machine the head tube to ensure proper headset bearing alignment. The tool usually has separate and interchangeable facing and reaming cutters which can vary widely with the many available headset standards. A headset bearing cup press is a bearing press specifically for pressing in interference-fit headset cups. Most sets come with special stepped bushings or adapters that contact the cups, preventing damage when installed. Some manufacturers (e.g. Chris King) also make proprietary adapters for installing their headsets. A crown race cutting tool is a hand tool used to counter-ream and face the base of the fork column at the crown (known as the crown race seat). A single cutter is usually used to perform both aspects of the cutting operation. The process machines the crown race seat to be precisely perpendicular to the steering column axis and of the correct press-fit diameter, ensuring the proper alignment of the crown race with the lower headset bearing. A crown race puller or remover is