Would depend on the bike, but a few hundred.
seat/handlebars
The bearings don't need friction, but everything else does. It there wasn't any friction it'd be impossible to bolt anything together.
The answer is Seat and Handle Bar
Yes. If you buy a bicycle from wal-mart, it will come with all the required parts, as tires, already mounted.
20000
No, that is why there are so many parts.
The main parts of a bicycle wheel are the rim, spokes, and hub.
Havoc is a brand of bicycle parts and helmets.
The bicycle is not a simple machine, there are too many interacting moving parts.
I can list the different bicycle parts for you, but I am unable to provide pictures. Some common bicycle parts include the frame, wheels, tires, handlebars, pedals, saddle, brakes, gears, chain, and crankset.
The main parts of a bicycle tire are the tread, sidewall, bead, casing, and inner tube.
Bicycle baskets can be purchased from bicycle stores, bicycle parts specialty stores, secondhand stores and from various sites on the internet such as eBay.
There are too many parts, and to many versions of each part for it to be possible to give an answer here.
The main parts of a bicycle frame are the top tube, down tube, seat tube, chainstays, and seatstays.
Bicycle parts can be seen at many stores that sell bikes like Wal-Mart , best buy , and a sports store. Here are a couple of sites for you to look at www.lonelyplanet.com/thorntree/thread.jspa?threadID=2172130 , and www.qbp.com , and www.slanecycles.com .
Bicycle parts are very rarely specific to a certain make & model. Functionally identical replacement parts will be available from almost any bicycle shop.
There are plenty of important parts on a bicycle. W/o any of these the bike wouldn't work. The main parts are wheels, frame and fork.