Most bike hubs are aluminium. Aluminium comes from Bauxite ore, which is refined and the metal aluminium extracted. Axles and bearings are generally steel, which comes from iron ore.
It is a hub.
The material that is used to manufacture Continental bicycle tires is rubber made from the Uniroyal company or other companies that specializes in supplying rubber for bicycle tires. To get a more specific answer to the question, a visit to the local bicycle shop can render an answer.
A bike hub is mainly turned on a lathe. Spoke holes are drilled and if it's a hub brake or a rear hub there may be some milling too.
In the bearings that go between the stationary part - the axle, and the rotating part - the hub.
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Metals, plastic, maybe even a wooden handle.
on the rear wheel, at the hub. it's the bit that the chain runs over.
polyp
Who made this japan bicycle
The stem of a bicycle can be made from alloy, carbon or titanium.
Usually by having a special rear hub which measures the output of the rider.
polyp