Yes. W/o bearings the crank would spin directly in the bottom bracket shell. This'd steal energy and eventually wear the frame out.
Bicycle bearings are pretty much the same as bearings anywhere. They're like small sleeves or rings that go between a moving part and a stationary part, to make the moving part spin lighter.
The bearings
Your question is very vague...is it how to remove bearings or how the replace bearings or how to size new bearings on an old worn shaft???? And what bearings??? There are several hundred bearings on a car...one kind of bearing on fishing reel...for or five bearings on a bicycle
In the bearings, where you want as little friction as possible.
If you need replacements, they can be bought at a hardware store. If you mean applications/uses ... bicycle wheels have ball bearings. Lots of rolling objects that move around an axle have either needle bearings or ball bearings or roller bearings.
That'd be rare. Ball bearings are far more common although I believe some pedals come with roller bearings.
The headset on a bicycle provides a rotatable interface between the bicycle frame and the bicycle fork. It is a set of components that consists of two cups that contain bearings, they ensure smooth steering.
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In the bearings that go between the stationary part - the axle, and the rotating part - the hub.
Shogun bicycle? If so headset bearings probably are bad or the brakes are dragging.
Answer: LUbricate the Chain (Not using WD40) Keep Tyres Inflated Keep All Bearings adjusted and greased.
Yes, because it contains finely machined bearings designed for the explicit purpose of spinning easily.
the gears and where the axis of the wheels