You need a inner bearing seal to keep the grease in the hub. A seal shall be installed/set into the hub, it holds the bearing in the hub during assembly, ultimately keeping grease in the bearing and not flung outward onto the brakes.
How does your inner bearing slide onto/fit on the stub axel"?
Is it direct fit or is there an inner race that goes on first?
Does the /is there a seal that you lightly hammer into the back of the hub after the greased up bearing is installed?
