The short version
- The cup is pressed into the hub and has almost nothing to grip. That is the whole difficulty.
- Most hubs have relief slots cast into the back so a drift can reach the cup edge.
- Work around the circumference in small steps. Driving on one spot cocks it and jams it harder.
- A new cone always gets a new cup. They wear as a matched pair.
The bearing lifts out by hand and the hub still has a polished steel ring pressed into it. That ring is the cup, and it is the part that takes twenty minutes when everything else took five.
Wheel bearing race removal is difficult for a specific reason. There is no lip, no thread and no shoulder to pull against.
Why a wheel bearing race resists
Fitting the new one brings its own way of going wrong. The cup is very slightly larger than the bore and was pressed home. The only exposed surface is a hardened tapered face.
Anything you grip it with either slips off that taper or damages the bore behind it.
Corrosion between the cup and the hub adds to it, particularly where a steel wheel bearing race sits in an aluminum hub. That combination grows oxide readily, which is on the corrosion page.
The slots made for wheel bearing race removal
Most hubs have two shallow notches machined behind each cup, opposite one another.
They exist so a drift can reach the back edge of the cup. People miss them and start attacking the taper from the front instead.
With the slots found, a brass drift and a hammer will move most cups without any special tool.
The wheel bearing race removal methods, in order
| Method | Notes |
|---|---|
| Brass drift through the relief slots | The intended method, works on most hubs |
| Slide hammer with an internal puller | Grips the cup edge, good where slots are missing |
| Pressing out with a suitable disc | Cleanest, needs the hub off and a press |
| Welding a bead around the inside | Last resort, effective, ruins the cup deliberately |
| Grinding a relief then splitting it | Risks the bore, only when nothing else works |
A bead run around the inside of a scrap cup cools and contracts, pulling the cup away from the bore.
It often drops out on its own. It also puts heat into the hub, so it belongs at the end of the list rather than the start.
Technique, which decides how long it takes
- Alternate between the two slots, moving the cup a little at a time from opposite sides.
- Never drive hard on one spot, because that tilts the cup and wedges it across the bore.
- Watch it stay square rather than watching it move.
- Use brass or a soft drift so nothing chips into the bore.
- Stop if it stops moving evenly and back it up rather than adding force.
Warming the hub expands the bore around a cup that has not warmed yet, which is often enough on its own.
Aluminum hubs respond particularly well because aluminum expands faster than the steel cup inside it.
Inspecting the bore afterward
This is the moment to look, because the bore will be hidden again in minutes.
Scoring or a bright polished band suggests the cup was turning in the bore rather than staying put. Check for that before fitting anything.
What that means for the new one is on the bore measurement page, and the tapered designs this applies to are on the bearing types page.
Putting the new one in
The reverse problem, and the easier half.
A new cup goes in square, driven on its outer edge only, until it seats fully against its shoulder. The sound changes clearly when it arrives.
The tool and the technique are on the race driver page.
A used cup carries the wear pattern of the cone that ran in it, and a new cone does not match that pattern.
They are sold as a set for that reason, and separating them wastes both.
Common questions
How does wheel bearing race removal actually work?
Through the relief slots behind it, with a brass drift, working alternately from opposite sides so it stays square.
What if my hub has no slots?
Use an internal puller with a slide hammer, or press it out with the hub off the car.
Why does it jam part way out?
Because it was driven hard on one spot and tilted. Back it up slightly and work the opposite side.
Does the welding method really work?
Yes. A bead run inside the cup shrinks it as it cools, often releasing it entirely. It also heats the hub, so it is a last resort.
Can I reuse the old race?
No. A used cup carries the wear pattern of its old cone, and a new cone on it wears quickly.
Does heat help?
A lot, especially on aluminum hubs. Warming the hub expands the bore around a cup that has not warmed yet.
What should I look for in the bore?
Scoring or a bright polished band, which suggests the old cup was turning rather than staying put.