Don't really know what you're tinking of with "mesh together"...
On a bike with external gears the gears will not mesh. There's the chain acting as a go-between to transfer the energy. On an internally geared bike you will have cogwheels that are interlocking and driving each other.
what is the pitch point
Crown and pinion gears are two types of mechanical gears that mesh together.
meshing gears
are when all gears are constantly engaged
Your bicycle may be squeaking because it is rusty. The gears, for example, on the bicycle may be rubbing together and causing friction, thus creating the squeaking noise. Try lubricating your bicycle with WD-40.
Matching the gears to mesh properly.
That bicycle has 18 gears.
The transmission input shaft has gears on it that mesh with the different drive gears. It is spun by force from the engine, as you select different gears with the shifter, there are different sets of gears being meshed together inside transmission. The synchronizers ensure that the gears being meshed together are turning at the same speed, thus resulting in a smooth shift and no damage to the gears.
an average bicycle has up to 24 gears but a bicycle has up to 30 gears
where the gears are always engaged.
a crown and pinion is a st of gears that mesh at an angle.
Usually a single part made up of a serious of Gears that mesh with various gears of main shaft