[MattR]

Originally Posted by GMP

I never do that and I never replace wheel bearings.

For me, it only takes a moment on a new bearing to lift off the bearing seal and do a sanity check. Most times, the bearings have a liberal amount of grease in them. I experienced some that had hardly any grease when new. Since it's quick to do, I lift the seal and pack with Belray waterproof grease if needed.

Word of caution: be very careful lifting off the seal, if you gouge the seal lip then you just did more harm than good.