There are internally geared bikes, where all the gears are tucked away inside the hub and then there are externally geared bikes, with a stack of differently sized sprockets on the outside of the hub. Apart from that they're just called gears.
Gears are called gears. You have internal gears and external gears. Front shifter + front derailer and rear shifter + rear derailer for bikes with external gears.
Well, at the handle bar you have the shifters, then you have the front and rear derailers, also spelled derailleurs.
the question is WHAT TYPE of gear like a spur gear, bever gear DUH
it is called mechanical energy.
It depends on the bike if the engine of bike is heavy it has more gears. Usually 5 gears are max gears.
2 gears
depends on the model. from 2-7 gears
MotoGP bikes have 6 gears.
Depending on the bike yes most adult sized bikes have gears
if you don't keep your chain and gears on your bike greased it will rust and come off.
Well, there's one bike called the autoshift, which looks a bit MTB-like and is supposed to do that, but a regular bike shouldn't
Changing Gears Flagstaff and the Mountain Bike - 2011 was released on: USA: September 2011
To change gears on the bike, all you have to do (while riding it) is press the B button. You don't have to hold it in, either. ~Lucario
Depending on the mountain bike that you have will depict the amount of gears. Most bikes for adults typically have about 21 gears. If this does no answer your question then what are levels?
a track bike, or a bike with internal hub gears.