I don't know actually a ball bearing works, below is a typical ball bearing, so which circle rotates and which one is stationary/ keep the wheel balance?

 

which circle rotates and which one is stationary

It depends how the bearing is being used. If it supports a rotating axle through the centre, then the outer ring is stationary and the wheel rotates with the axle and inner ring. Alternatively, the axle and inner ring may be stationary and the wheel rotates with the outer ring. This alternative is more likely for a bike.
A bearing normally has nothing to do with keeping the wheel balanced.

 

It depends how the bearing is being used. If it supports a rotating axle through the centre, then the outer ring is stationary and the wheel rotates with the axle and inner ring. Alternatively, the axle and inner ring may be stationary and the wheel rotates with the outer ring. This alternative is more likely for a bike.
A bearing normally has nothing to do with keeping the wheel balanced.

this is for motorbike wheel, I dont know I mean the wheel frame hole will contact directly with the outer ring of the ball bearing? still have friction between them, right??

 

There are different bearing construction but the principle is the same.
There are two rings, an inner ring and outer ring called "race" or "raceway".
The two rings will rotate with respect to each other, with the actual bearing balls or cylinders between the two raceways. It is the ball or cylinder that rotates in order to eliminate any sliding friction between the two rings.
In any application, one ring is fixed while the other rotates.

 

There are different bearing construction but the principle is the same.
There are two rings, an inner ring and outer ring called "race" or "raceway".
The two rings will rotate with respect to each other, with the actual bearing balls or cylinders between the two raceways. It is the ball or cylinder that rotates in order to eliminate any sliding friction between the two rings.
In any application, one ring is fixed while the other rotates.

View attachment 344595

specifically, here is ball bearing for electrical motorbike wheel, if a shaft put through the inner ring, it means that the outering will rotate , inner ring will be stationary?

 

It depends how the bearing is being used. If it supports a rotating axle through the centre, then the outer ring is stationary and the wheel rotates with the axle and inner ring. Alternatively, the axle and inner ring may be stationary and the wheel rotates with the outer ring. This alternative is more likely for a bike.
A bearing normally has nothing to do with keeping the wheel balanced.

specifically, here is ball bearing for electrical motorbike wheel, if a shaft put through the inner ring, it means that the outering will rotate , inner ring will be stationary?

 

specifically, here is ball bearing for electrical motorbike wheel, if a shaft put through the inner ring, it means that the outering will rotate , inner ring will be stationary?

The wheel rotates, correct?
Is the shaft rotating?

 

The wheel rotates, correct?
Is the shaft rotating?

the wheel rotates, the shaft I think is not rotated because it is put through inner ring and play a role in keeping the wheel balanced?

 

It depends on the function of the "shaft".
If the shaft or axle is locked on to the wheel fork, then yes, the wheel turns with the outer ring. Ordinary bicycle wheel bearings are usually "floating" and not locked to either axle or wheel.

This has nothing to do with wheel balancing.

What do you mean by "keeping the wheel balanced?
Are we referring to the front or back wheel?
On which wheel is the motor located?

Post a photo of the bike or wheel in question.

 

It depends on the function of the "shaft".
If the shaft or axle is locked on to the wheel fork, then yes, the wheel turns with the outer ring. Ordinary bicycle wheel bearings are usually "floating" and not locked to either axle or wheel.

This has nothing to do with wheel balancing.

What do you mean by "keeping the wheel balanced?
Are we referring to the front or back wheel?
On which wheel is the motor located?

Post a photo of the bike or wheel in question.

I mean the front wheel, motor is the back wheel. Btw, why cannot I see the button'' Full image'' when uploading images?





Moderator edit: reduced photo size

 

It depends on the function of the "shaft".
If the shaft or axle is locked on to the wheel fork, then yes, the wheel turns with the outer ring. Ordinary bicycle wheel bearings are usually "floating" and not locked to either axle or wheel.

This has nothing to do with wheel balancing.

What do you mean by "keeping the wheel balanced?
Are we referring to the front or back wheel?
On which wheel is the motor located?

Post a photo of the bike or wheel in question.

with this kind, the ball bearing is put directly in the center hold of the wheel, and the wheel contacts directly with the ball bearing with friction, right? because only balls inside the bearing.

 

with this kind, the ball bearing is put directly in the center hold of the wheel, and the wheel contacts directly with the ball bearing with friction, right? because only balls inside the bearing.
View attachment 344603

what you think, @Alec_t ?

 

I mean the wheel frame hole will contact directly with the outer ring of the ball bearing?

If that's the way the bearing is being used then the outer ring will be a force fit in the frame (a hydraulic or screw press is often used to force the bearing into the frame hole) and will not move.

 

If that's the way it is being used then the outer ring will be a force fit in the frame and will not move.

yeah, and the outer ring absorbs the same load as the wheel frame, right? because no movement, no slip between them, they only move over the balls and the inner ring??

 

Yes.