this is far from a complete answer, I've just started learning how to restore vintage bikes. But I know the hub is the circular metal peice that allows the tires to spin. It is in the middle of each tire where the spokes meet. I know this cuz I have a early 1930's Montgomery ward cruiser that needs a new back hub. hope that helps.
The Bicycle Hub the is the central part of a bicycle wheel it is circular and is connected to the spokes, at the bike hubs centre are bearings and this is where the spindle is fitted to allow rollling.
A bicycle hub is a metal sleeve. On the inside there's a pair of bearings that allows the hub to turn on the axle, on the outside there is a pair of flanges providing a place to anchor the spokes that connects the hub to the rim.
For rear hubs there's also (usually) a sprocket sitting on a pawl-and-ratchet mechanism that allows the wheel to both drive and coast.
The hub may also have a mounting flange for brake rotors, or a drum brake, or have a drum brake integrated.
Some rear hubs have planetary gears inside.
Some front hubs have a dynamo integrated.
The hub is the center part of the wheel, the part that rotates around the axle.
The hub provides an anchor point for all the spokes, and a place to put the axle bearing for the wheel to revolve around.
It is a hub.
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.
http://forums.mtbr.com/showthread.php?t=283367
polyp
on the rear wheel, at the hub. it's the bit that the chain runs over.
Usually by having a special rear hub which measures the output of the rider.
polyp
No. there are quite a few other places where you can add an electric motor to a bicycle. However, the hub motor is quite probably the one which requires the least amount of changes to the rest of the bike.
The rear wheel has a different hub; the gears attach to it. Alternatively the rear hub has gears or a brake or a dynamo built into it. The front hub will sometimes have a dynamo built into it, other than that it is just a plain hub.
Too much to answer here, I'll post a link.
yes