Servicing Your Topaz MX Rear Shock: Tools and Tips

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The Topaz MX [paid link] from DVO is a high-performance rear shock that delivers exceptional performance for serious riders. Proper servicing of your Topaz MX [paid link] is crucial for maintaining its longevity and optimal performance. In this guide, we’ll cover everything you need to know about maintaining and servicing your Topaz MX rear shock, from installation and adjustments to troubleshooting and performance optimization.

Tools Required

To service the Topaz MX rear shock, you’ll need the following tools:

  • DVO Topaz MX Service Kit
  • Shock pump with pressure gauge
  • 5mm and 6mm Allen wrenches [paid link]
  • Torque wrench [paid link]
  • Needle nose pliers
  • T20 Torx wrench [paid link]
  • Suspension fluid (specific to DVO shock)
  • 10mm socket wrench
  • Cleaning supplies (rags, degreaser)

Installation of the Topaz MX Rear Shock

Installing the Topaz MX rear shock correctly is essential for ensuring the proper functionality of your bike’s suspension. Here’s a step-by-step guide for installation:

  1. Remove the Existing Rear Shock:
    • Use a 5mm Allen wrench [paid link] to remove the bolts securing the old shock to the frame.
    • Carefully slide the shock out of its mounting points.
  2. Prepare the Topaz MX Shock:
    • Make sure the Topaz MX shock is fully deflated before installation.
    • Check that all seals are intact and the shock body is free of any debris.
  3. Install the Topaz MX Shock:
    • Position the shock in the frame mounts, ensuring the eyelet or mounting hardware aligns with the frame.
    • Tighten the mounting bolts with a 5mm Allen wrench [paid link]. Ensure that the bolts are torqued to the manufacturer’s specifications (typically 8-10 Nm for the mounting bolts).
    • Double-check that the shock is securely installed.
  4. Set Initial Air Pressure:
    • Use the shock pump to set the initial air pressure based on your rider weight. The recommended starting point is often provided in the shock manual or setup guide.

Adjustments for Optimal Performance

The Topaz MX rear shock offers various adjustments that can be fine-tuned to match your riding style and terrain. Proper adjustment will help you achieve the best performance and comfort.

Rebound Adjustment

The rebound adjustment on the Topaz MX controls how quickly the shock returns to its original position after compression. A slower rebound provides more control but may feel sluggish, while a faster rebound allows for quicker movement but can lead to instability.

  1. Locate the Rebound Knob: This is typically located at the bottom of the shock.
  2. Adjust the Rebound: Turn the rebound knob clockwise to slow down the rebound or counterclockwise to speed it up. Start with the factory setting and make small adjustments based on your preference.

Compression Adjustment

The compression adjustment controls how much resistance the shock provides when it is compressed by the rider’s weight or obstacles. The Topaz MX features both low-speed and high-speed compression adjustments.

  1. Low-Speed Compression: This adjustment affects the shock’s response to small, slow bumps, such as pedaling inputs. It is typically adjusted via a dial near the shock body.
  2. High-Speed Compression: This controls the shock’s response to large impacts, like drops or large rocks. Fine-tuning both compression settings ensures a balance between comfort and control.

Air Pressure

Adjusting the air pressure in the shock is critical for proper suspension performance. Too little air pressure can lead to bottoming out, while too much can make the shock feel harsh.

  1. Set the Air Pressure: Use a shock pump to adjust the air pressure. Start by setting it to the recommended pressure based on your body weight and riding style.
  2. Fine-Tune: After initial rides, adjust the air pressure based on how the shock feels. If you find that the bike feels too soft or too stiff, adjust the pressure accordingly.

Troubleshooting Common Issues

Over time, you may encounter some common issues with your Topaz MX rear shock. Here’s a list of problems and solutions.

Shock Not Holding Air Pressure

If your shock is losing air pressure, this could be due to a faulty seal or valve issue.

  1. Inspect the Seals: Check for any visible damage or wear on the seals. If damaged, replace them with the seals from the Topaz MX service kit.
  2. Check the Valve: Inspect the valve for any dirt or debris that may be preventing a proper seal. Clean the valve and try inflating the shock again.

Reduced Performance or Stiffness

If the shock feels overly stiff or doesn’t provide the expected performance, the cause might be low oil levels or incorrect adjustments.

  1. Check the Oil Level: Ensure the oil level inside the shock is sufficient. If the oil is low, perform an oil change as described in the Topaz MX service manual.
  2. Recheck Adjustments: Make sure that both rebound and compression settings are properly adjusted for your weight and riding style.

Excessive Noise or Leaking

If you hear unusual noises or see oil leaking from the shock, it could indicate a need for maintenance.

  1. Inspect the Shock Body: Check for any signs of cracks or damage to the shock body. If damage is found, you may need to replace the shock.
  2. Check for Leaks: Look for any visible oil leakage around the seals and shaft. Leaking oil often indicates that the seals need to be replaced.

Customization for Performance Optimization

The Topaz MX rear shock offers a variety of ways to optimize performance. Here are some advanced customization tips:

  1. Choose the Right Spring Rate: DVO offers different spring rates for the Topaz MX, allowing riders to fine-tune the shock based on their weight and riding preferences. Select a spring rate that provides the right balance of comfort and performance for your riding style.
  2. Change the Shock’s Volume Spacers: Volume spacers can adjust the shock’s bottom-out resistance. Adding or removing spacers allows for further fine-tuning of the shock’s overall progression, enabling you to tailor the shock’s feel to different types of terrain.
  3. Upgrade the Seals: For enhanced durability and performance, consider upgrading to high-quality aftermarket seals designed to minimize friction and prevent leaks over time.

Compatibility with Other Drivetrain Components

The Topaz MX rear shock is compatible with most modern mountain bike frames, but compatibility with other drivetrain components should be checked before installation. Ensure that the shock’s travel, eyelet dimensions, and mounting hardware match the frame’s specifications. Additionally, when choosing a shock, consider the type of riding you do—enduro, cross-country, or downhill—because this will influence the ideal shock setup.

Comparison with Similar Models

When considering a rear shock, it’s important to compare it with other models on the market. Here’s how the Topaz MX stacks up against other popular rear shocks.

  1. Fox Float X2: The Fox Float X2 is known for its wide range of adjustments and superior damping control. However, the Topaz MX tends to offer a more supple feel, especially for riders who prefer a smoother ride over rough terrain.
  2. RockShox Super Deluxe: The RockShox Super Deluxe is another popular shock in this range, offering a simple setup and good overall performance. However, the Topaz MX is often preferred by riders looking for more fine-tuned adjustments and a higher level of customization.

In general, the Topaz MX is an excellent choice for riders who prioritize fine-tuning suspension characteristics, offering a range of adjustments that can cater to a variety of riding styles and conditions.