A component or product that's not included or intended as original equipment. A type of shock absorber that uses air for the spring and oil for damping. A bicycle frame material that is abundant and inexpensive. Its main drawback is that aluminum is not terribly strong so frames made from aluminum require tubes of substantial diameter. The advantage of aluminum is it allows for creative frame designs.
Most downhill bikes are aluminum.
A process that hardens and seals metal against corrosion. It can also be used to dye metal colors such as blue, red or black. Attachments that mount on the ends of a handlebar. Bar-ends allow more leverage when climbing and more hand positions when cruising. Referring to a black computer box that is mounted on the bicycle.