There are two types (if you can call them types) one is where the input force is exerted on the wheel, so you turn the wheel and the other is where the input force is on the axle, when you turn the axle.
The wheel, and many other things a bicycle is a compound machine
lever, wheel and axle, screw, wedge, pulley, and inclined plane
A bicycle
I has 4 axles. One on each wheel.
swirly chairs
the steering wheel is connected to axles, the axles changes angles thus moving the rims.
the vehicles carrying heavy loads are provided with multi-wheel axles to increase the area and decrease the pressure.
Need to know if 2 wheel or 4 wheel drive for the front. Either way, there is no nut on the back axles.
Depends on make and model of bicycle
2
There is an axle for each wheel.
a cylinrical barrel is literally a cylinder. they can be found on wheel and axles