I have a bunch of small conveyor rolls that when the bearing fails you end up with the outer race still in there.
What I do, and use this method at your own risk, is run a bead of weld on the inside of it, it will work with mig but works best stick welding.
As the weld cools it shrinks the race along with it and they normally just fall out with a tap on the side of the workbench.