Front hub runout

I think you need to go back to basics
Check the bearings are in properly
The either set the wheel up between centers or even back in the forks but without the disc fitted
Then use a DTI gage on the disc mounting flange and see exactly where the problem is
Maybe just one high spot will be found
I'd be tempted to file it down by hand and trial fit until you have as close to zero runout you can get
Then fit the disc and check

Aiden said:

Yes, sorry I didn’t know the name.
Rechecked rotor runout at 0.015”. Put the old rotor on and get 0.011

Click to expand...

There you go. 15x larger than claimed by the manufacturer. Now check the flange flatness and paralellity to the brake disc face.
Also check hub flange as there could be some burr preventing the flats to mate.

- Knut

Only the single row bearing with the locking ring seats.
The double row 4203 bearing is floating axially due to not seating at the base of the corresponding hub bearing bore being deeper (which is why a wider 5203 bearing can be used when the inner spacer is modified to suit that extra width without affecting the outer width of both bearings)
That is why seating the single row bearing then pulling the double row bearing in with full width (contact both the inner and outer races of both bearings) discs to seat the double rows inner on the spacer has some merit.

Place the axle in a vice vertically with soft jaws and run the wheel horizontal on it.
You should be able to set a dial gauge up off the upper stick out of the axle, that will soon tell you what is going on with the disc to hub interface taking for granted as already posted there are no risers (at the fastener threaded holes, lumps bumps or anything else to induce disc rotor run out.

Could you lightly face the hub surface if it was wavy in a lathe (which would move the rotor inward obviously) with enough swing on a mandrel to suit, yes.
Walk in off the street to an average shop, probably not.

That’s exactly the arrangement I was using to measure the hub run. I did reseat the bearing and sanded a bit on the high side of the hub, repositioned the rotor and got down to 6 thousandths, which is a lot better but still a slight perceptible wobble within the caliper. I may see what kind of vibration that results in and move on for now but will report back