Step-by-Step: Bearing Replacement in Deemax DH 29 Wheels

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The Mavic Deemax DH 29 [paid link] is a popular choice for downhill riders who need a high-performance, durable wheelset. Over time, the bearings in these wheels can wear out due to constant use, especially in challenging riding conditions. Replacing these bearings is essential to maintaining smooth wheel rotation and optimizing overall performance. This guide will walk you through the process of bearing replacement for your Mavic Deemax DH 29 [paid link] wheels.

Tools Required

  • Mavic Deemax DH 29 wheels
  • New bearings (compatible with Mavic Deemax DH 29)
  • Bearing press [paid link] or bearing puller tool
  • 5mm hex wrench
  • 8mm hex wrench
  • Torque wrench [paid link]
  • Small hammer or rubber mallet
  • Grease
  • Clean cloth
  • Snap ring pliers
  • Flathead screwdriver (for removing the seals)

Bearing Replacement Process

1. Remove the Wheel from the Bike

Before you begin, ensure that your bike is stable and secure. Use a 5mm hex wrench to remove the wheel from the bike, making sure to detach the quick release or thru-axle.

2. Remove the Cassette or Freehub

Using an 8mm hex wrench, remove the cassette or freehub from the wheel. If you’re unsure of the type of freehub on your Deemax DH 29, check the manufacturer’s guide or look for any identification markings.

3. Remove the Hub Body

Once the freehub is removed, you need to take off the hub body. Use a 5mm hex wrench to loosen the hub body bolts. Gently remove the hub body from the hub shell, exposing the bearings inside the hub.

4. Take Out the Old Bearings

The bearings are now visible and ready to be replaced. Depending on the model and design, there may be a seal that covers the bearings. Use a flathead screwdriver to carefully remove the seal. After that, use a bearing puller or press to remove the old bearings. Be gentle to avoid damaging the hub.

5. Clean the Hub Shell

Before installing the new bearings, thoroughly clean the hub shell to remove any dirt, grime, or old grease. Use a clean cloth to wipe the interior of the hub shell, making sure there’s no debris left inside.

6. Install the New Bearings

Apply a light layer of grease to the bearing seats in the hub shell. This will ensure a smooth installation of the new bearings and help to reduce friction. Press the new bearings into place using a bearing press [paid link] tool. Make sure the bearings are seated correctly and securely within the hub.

7. Reinstall the Hub Body

Once the new bearings are installed, it’s time to put the hub body back onto the hub shell. Make sure it’s aligned properly and tighten the bolts using the 5mm hex wrench. Follow the manufacturer’s torque specifications to avoid over-tightening.

8. Reattach the Freehub or Cassette

Now that the hub body is securely in place, it’s time to reinstall the freehub or cassette. Slide it back into position and tighten it using the appropriate wrench. Ensure that it is properly locked in place and that there’s no play in the assembly.

9. Reinstall the Wheel onto the Bike

With the wheel fully reassembled, it’s time to mount it back onto the bike. Use the 5mm hex wrench to secure the wheel using the quick release or thru-axle.

10. Test the Wheel

Once everything is tightened and properly assembled, spin the wheel to ensure the new bearings are running smoothly. There should be no unusual noise or resistance when spinning the wheel. If there is, double-check your bearing installation and alignment.

Troubleshooting Common Issues

1. Bearing Doesn’t Fit Properly

If the new bearings don’t fit correctly, ensure that you’ve selected the right size for your Mavic Deemax DH 29 wheels. Mavic offers specific bearing sizes for their different models, and using incorrect bearings can lead to poor performance or damage.

2. Hub Body is Stiff

If the hub body feels stiff after bearing replacement, it may be over-tightened. Revisit the torque specifications and ensure the hub body bolts are not too tight, which can prevent smooth rotation.

3. Wheel Wobbles

A wobbly wheel can indicate that the bearings have not been installed evenly or that other components are misaligned. Recheck the bearing installation process and make sure the hub body and freehub are secure.

4. Unusual Noise from Hub

If you hear strange noises after bearing replacement, check for debris inside the hub or ensure that the bearings are properly greased. Sometimes, new bearings can require a break-in period.

Customization and Optimization

Grease Application

Using high-quality, waterproof grease is essential for prolonging the lifespan of your bearings. Apply a thin, even layer of grease to the bearing surfaces and seals before installation. This helps reduce friction and protects the bearings from moisture and dirt.

Hub Maintenance

Regularly inspect your Mavic Deemax DH 29 wheels for any signs of wear or damage to the bearings. If you notice any grinding, excessive play, or wobbling, it’s a good idea to replace the bearings sooner rather than later to avoid further damage.

Wheel Tuning

To get the best performance from your Deemax DH 29 wheels, consider regular maintenance, including cleaning the hub, checking the spoke tension, and ensuring the freehub mechanism is working smoothly. A well-maintained wheel will provide better handling and improve overall riding efficiency.

Comparison with Similar Models

The Mavic Deemax DH 29 is known for its durability and performance in downhill and enduro riding. When comparing it to similar wheelsets like the Shimano Saint or the DT Swiss EX 1501, the Deemax DH 29 stands out due to its robust rim design and reliable hub. The bearings in the Deemax DH 29 are designed to handle high impact, making them ideal for aggressive riders. However, the Shimano Saint may offer a slightly lighter design, while the DT Swiss EX 1501 provides excellent overall wheel stiffness.

Compatibility with Other Drivetrain Components

The Mavic Deemax DH 29 wheels are designed to be compatible with most standard downhill and enduro drivetrain systems. The freehub body on the Deemax DH 29 is compatible with both 9-speed and 10-speed cassettes, which gives riders flexibility when choosing drivetrain components. Ensure that the freehub body matches your bike’s drivetrain setup to avoid compatibility issues. If upgrading or replacing other drivetrain parts, double-check for compatibility with your wheelset to maintain optimal performance.