It's a freewheel. I had a skewer snap, which I think was due to the axle being unable to spin without unscrewing.
When the wheel is on the bicycle and spinning, the wheel has no room to move to the left, so the axle must move to the right. The axle starts protruding from one side of the wheel.
If there was a skewer in the axle, this would manifest as the skewer spinning with the wheel (if loosened) or tightening as the wheel spins (if tightened).
Last time removing the axle, I didn't know to inspect the ball bearings or grease up the bearings and their cup. I greased everything else.
I'm about to remove the axle and examine the ball bearing, so I might add more information.
When the wheel is on the bicycle and spinning, the wheel has no room to move to the left, so the axle must move to the right. The axle starts protruding from one side of the wheel.
If there was a skewer in the axle, this would manifest as the skewer spinning with the wheel (if loosened) or tightening as the wheel spins (if tightened).
Last time removing the axle, I didn't know to inspect the ball bearings or grease up the bearings and their cup. I greased everything else.
I'm about to remove the axle and examine the ball bearing, so I might add more information.