Notice these comment's from the build tip's section. My rear bearings where binding as well, this would knock a set of bearings out in no time, whatever ABEC they are. I've now added some shims as below, and it sweet.
Binding rear Hub Bearings..
Place a 5x6x.2mm shim on the axle before installing in the hub.
There is a step in the axle, the face of that step meets up with the inner edge of the outer hub bearing.
Placing a small shim on the axle before that step will take the side load off the outer hub bearing making it last much longer, with no bind.
.2mm was plenty on my car to crank the wheels down with no binding, but experiment to see what you need.
Dayton
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