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The short version
- The Z4 wheel bearing up front for 2003 to 2008 is HA590308. It is a bolt-on hub unit, not a pressed bearing.
- The rear for the same years is 513106, a press-in ball bearing. That is a completely different design at the other end of the same car.
- 2009 onward cars run their own listings at both ends, matched by VIN.
- 513106 is a heavily reused industry number. It also turns up on the classic Saab 900 front and various Porsche sports car listings.
Most cars pick one wheel bearing design and use it at every corner. The first generation Z4 uses two instead: a bolt-on hub up front, a press-in bearing at the rear.
One bolt-on, one press-in
The Z4 wheel bearing at the front is HA590308, a bolt-on hub unit, for 2003 to 2008.
The rear on those same cars is 513106, a press-in ball bearing. That is a different design entirely from the front.
Z4 wheel bearing part numbers
| Years | Detail | Number |
|---|---|---|
| 2009 onward | Both ends | own listings, match by VIN |
| 2003 to 2008 | Front, bolt-on hub unit | HA590308 check price |
| 2003 to 2008 | Rear, press-in | 513106 check price |
Every model year this chart resolves: 2003, 2004, 2005, 2006, 2007 and 2008. On this chart a 2009 or newer BMW Z4 sits past the catalogs, so those cars go by the old part or the VIN.
Price links lead to Amazon searches for that number. As an Amazon Associate this site earns from qualifying purchases.
Lookups run through the cross reference page.
The rear Z4 wheel bearing number, 513106, also shows up on the classic Saab 900 front. It appears again on various Porsche sports car listings.
Match the application line for the year and corner, not just the number itself.
A well traveled number
513106 is not unique to BMW. Porsche listed the same number for early sports car fronts, a story told on the Boxster page.
The Z4’s own predecessor, the Z3, has its own wheel bearing chart worth comparing on the Z3 page.
Two designs, one car
The front hub unit bolts straight into the knuckle as a cartridge. The rear ball bearing presses into its housing instead, per the press-in page.
That split matters for anyone budgeting labor. One corner is a bolt-on job, and the other is not.
The make overview is on the BMW page.
Diagnosing a Z4 wheel bearing
- Confirm the model year before pricing either corner.
- Note which end is noisy, since the front and rear are different jobs entirely.
- Weave at speed and place the hum by axle.
- Rock each wheel at twelve and six for play.
- Budget a press only for the rear; the front is a bolt-on swap.
The full routine is on the checking page.
Common questions
Which Z4 wheel bearing goes up front?
HA590308, a bolt-on hub unit, for 2003 to 2008 cars.
What about the rear?
513106, a press-in ball bearing, a different design from the front.
Do I need a press for both ends?
No. The front bolts on as a cartridge; only the rear presses in.
Does the Porsche connection mean the parts interchange?
The number matches, but always confirm the application line for year and corner before buying.
What about a 2010 Z4 wheel bearing?
That generation runs its own listings at both ends. Match by VIN.