If it has external gears you can't. They have to have the chain moving tp be able to shift. At best you can lift the rear wheel of the floor/ground, spin the crank, and change the gears. Remember to avoid cross chaining.
how it is produce a moving bike
practice practice practice tricks
practice
Kinetic.
A moving bicycle or bike will not fall when the opposing forces are balanced.
Get an Acro Bike and hold down B while moving.
Your momentum wants to keep moving forward.
friction
the role of the gullet is a wire in a bike and it is continiously moving to keep the bike straight
inertia
bicycle
it is called mechanical energy.