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The short version
- 1990-1996 Q45 front: serviceable tapered bearing assembly JRM3848-90UA1 with seal 710108, adjust and repack.
- 1997-2001 Q45 front: bearing assembly JRM3449-90UA1 with seal 710292, the same assembly the J30 used.
- 2002-2006 Q45 front: bolt-on hub unit HA590126, no adjustment or repack possible.
- 2002-2006 Q45 rear: bearing module BM500004; earlier rears are match old part.
Three generations of one nameplate span three different philosophies of bearing design. A mechanic who serviced a 1992 Q45 and one who replaced a hub on a 2005 Q45 barely worked on comparable parts. The Q45 wheel bearing story is really a shrunk-down history of the whole industry.
From hand-adjusted to sealed for good
The first two Q45 generations used serviceable tapered bearing assemblies that owners adjusted and repacked as maintenance items.
The final generation replaced that with a sealed hub unit that bolts on and gets replaced whole, no adjustment involved.
Q45 wheel bearing part numbers
| Years | Detail | Number |
|---|---|---|
| 2002-2006 Q45 | Front hub unit, bolt-on | HA590126 check price |
| 2002-2006 Q45 | Rear bearing module | BM500004 check price |
| 1997-2001 Q45 | Front bearing assembly | JRM3449-90UA1 check price |
| 1997-2001 Q45 | Front seal | 710292 check price |
| 1997-2001 Q45 | Rear bearing | match old part |
| 1990-1996 Q45 | Front bearing assembly | JRM3848-90UA1 check price |
| 1990-1996 Q45 | Front seal | 710108 check price |
| 1990-1996 Q45 | Rear bearing | match old part |
Every model year this chart resolves: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 and 2006.
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Lookups run through the cross reference page.
None of the three front assemblies interchange. A 1994 Q45 and a 1999 Q45 look similar but need different Q45 wheel bearing assemblies entirely.
Rear bearings before 2002 have no dedicated catalog listing here, so match the old part when replacing one. The 2002-2006 rear module, BM500004, is the only rear number given.
Serviceable versus sealed
The 1990-1996 and 1997-2001 fronts share a design philosophy even though the parts differ. Both are tapered assemblies meant to be adjusted and periodically repacked with fresh grease.
The 1997-2001 assembly, JRM3449-90UA1, was not unique to the Q45 either. Infiniti used the same assembly in the J30, a sedan sold alongside the Q45 of that era, before the lineup later evolved into cars like the M35.
What the 2002-2006 hub changed
HA590126 marked the end of owner-serviceable bearings on this nameplate. The bolt-on hub bundles the bearing, races, and sensor into one sealed unit that gets replaced as an assembly.
That shift mirrors what happened across most of the industry during the same years, visible in later cars like the G35 and the rest of the Infiniti lineup.
Diagnosing a Q45 wheel bearing
- Identify the generation first. A Q45 wheel bearing diagnosis starts with the model year, since the repair path differs by generation.
- Check for play by hand. Jack the corner, grab the tire at 12 and 6 o’clock, and rock it to feel for looseness.
- Listen for a speed-linked hum. A rising drone that tracks road speed points to bearing wear rather than a drivetrain issue.
- On pre-2002 cars, check adjustment before condemning the bearing. A loose or over-tight tapered bearing can mimic wear symptoms.
- Run a full inspection before ordering parts. A proper wheel bearing check confirms the diagnosis and the generation-specific part needed.
Common questions
Can the 1990-1996 Q45 front bearing be repacked instead of replaced?
Yes. That generation uses a serviceable tapered assembly meant to be adjusted and repacked as routine maintenance.
Does the 2002-2006 Q45 front hub need adjustment?
No. HA590126 is a sealed bolt-on unit with no adjustment procedure, unlike the earlier generations.
What is the rear Q45 wheel bearing part number before 2002?
There is no dedicated catalog number for those years. Match the old part when replacing it.
Do the 1990-1996 and 1997-2001 front assemblies interchange?
No. JRM3848-90UA1 and JRM3449-90UA1 are different assemblies with different seals, despite the similar naming.
Did any other Infiniti model share the 1997-2001 Q45 wheel bearing?
Yes. The J30 used the same front assembly, JRM3449-90UA1, during that era.