Your Guide to 1990-2005 Mazda Miata Wheel Bearings
That humming or grinding noise from your wheels isn't just annoying—it's a sign you need to check your wheel bearings.
- The most common sign of failure is a humming or grinding noise that changes with speed.
- 1990-2005 Miatas use a bolt-on hub assembly for the front and a press-in bearing for the rear, which requires special tools.
- For best results and longevity, choose premium aftermarket brands like NSK, SKF, or Timken, which are often OEM suppliers.
- Driving with a bad wheel bearing is unsafe and can lead to a complete failure and loss of vehicle control.
Is Your Miata's Wheel Bearing Failing?
A bad wheel bearing on a Miata usually makes its presence known with noise. You might hear a humming, rumbling, or grinding sound that gets louder as you drive faster. The noise might also change or get louder when you turn in one direction. Another common test is to safely jack up the car and check for play in the wheel by trying to wiggle it from the top and bottom (12 and 6 o'clock positions). 🎬 Watch: A pro guide to 100% diagnosing a bad bearing. If you feel any looseness or hear a clunking sound, the bearing is likely worn out and needs immediate attention.
Choosing the Right Aftermarket Bearing
When it comes to replacing wheel bearings on your NA or NB Miata, you have options. The original factory bearings were typically made by Koyo or NSK, which are known for their quality. Many aftermarket brands offer parts that meet or exceed this quality. Aftermarket parts are generally separated into different quality tiers.
| Tier | Brands | Description |
|---|---|---|
| Premium | NSK, SKF, Timken, FAG | These brands are often original equipment manufacturers for many car companies and are widely considered to be the highest quality. They use high-quality steel and precision manufacturing, making them a top choice for longevity and performance, especially for cars that are driven hard. |
| Mid-Grade | National Bearing, Beck Arnley | These brands offer a good balance of quality and price. National is a well-known bearing brand, and Beck Arnley often re-packages parts from OEM suppliers, so you can sometimes get a premium bearing in their box. |
| Economy | Dorman, Mevotech, GMB, WJB, TrueDrive | These are budget-friendly options. While they will get your car back on the road, owner experiences suggest they may not last as long as premium or mid-grade bearings. They can be a good choice for a car that is not driven daily or for owners on a tight budget. |
Front vs. Rear Bearings
For the 1990-2005 Miata, the front and rear wheel bearings are different parts. The front uses a complete hub and bearing assembly that is relatively easy to replace. The rear, however, uses a bearing that must be pressed into the hub, which is a much more involved job. Always confirm you are buying the correct part for the front or rear.
Known Issues, Recalls, and Service Bulletins
Searches for official recalls or Technical Service Bulletins (TSBs) from Mazda or the NHTSA for wheel bearing issues on the 1990-2005 Miata did not reveal any specific, widespread defects. Failures are generally due to normal wear and tear over time and mileage. However, front wheel bearings are noted by some enthusiasts as a known failure point, especially on cars used for performance driving or racing.
A Note on Installation
Replacing the front wheel bearing hub assembly is a straightforward job for a DIY mechanic with basic tools. However, 🎬 See this full guide on replacing the front hub assembly. replacing the rear wheel bearing is much more difficult. It requires removing the entire hub assembly from the car and using a hydraulic press to remove the old bearing and install the new one. This is not a job for most home mechanics. It is highly recommended to take the hub assembly to a machine shop or your mechanic to have the new bearing pressed in.
🎬 Watch: A walkthrough of the complex rear wheel bearing replacement.Frequently Asked Questions
Do I need to replace wheel bearings in pairs?
While you only need to replace the failed bearing, it's often a good idea to replace them in pairs (both fronts or both rears). If one bearing has failed due to age and mileage, the other side is likely not far behind.
Are front and rear wheel bearings the same on a 1990-2005 Miata?
No, they are different parts. The front is a bolt-on hub assembly, while the rear is a press-in bearing. OEM part numbers are NA01-33-04XA for the front and B01A-33-060A for the rear.
What happens if I don't replace a bad wheel bearing?
Continuing to drive on a bad wheel bearing is dangerous. The bearing can overheat and seize, or it can fail completely. A complete failure can cause the wheel to wobble excessively or even detach from the car, leading to a total loss of control.
What is the difference between a hub assembly and a press-in bearing?
A hub assembly (like the Miata front) is a single unit that includes the hub, bearing, and mounting flange that bolts directly to the suspension. A press-in bearing (like the Miata rear) is just the bearing itself, which must be pressed into the existing hub using special tools.
Helpful Videos
Technical Specifications
OEM Part Numbers: NA01-33-04XA (Front) B01A-33-060A (Rear)
The 1990-2005 Miata uses a bolt-on wheel hub assembly for the front wheels and a separate press-in wheel bearing for the rear wheels. The rear bearing has a 40mm inner diameter, 74mm outer diameter, and 40mm width.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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