An aluminum frame is a type of structure or framework that is made primarily from aluminum, an element known for its strength-to-weight ratio and corrosion resistance. In the context of a bicycle, an aluminum frame refers to a bike whose main structural component is made from aluminum alloys, which are mixtures of pure aluminum with other elements such as copper or magnesium to improve its strength and durability. Aluminum frames are typically lightweight, making them ideal for cycling enthusiasts who prioritize speed and agility in their rides.