DIY Maintenance Guide for Your Bomber CR Trunnion Rear Shock

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The Marzocchi Bomber CR Trunnion [paid link] Rear Shock is a high-performance shock designed for trail and enduro bikes, offering excellent control and stability. Proper maintenance ensures longevity, optimal performance, and smooth riding experiences. This guide will walk you through the essential installation, adjustment, troubleshooting, and maintenance steps for your Bomber CR Trunnion [paid link] Rear Shock.

Tools Required

Installation of the Bomber CR Trunnion Rear Shock

Installing the Bomber CR Trunnion Rear Shock is a straightforward process, but ensuring it’s done correctly is essential for performance and safety.

Step 1: Prepare Your Bike

Before installing the shock, ensure your bike is on a stable surface, and the rear wheel is off the ground. This will allow for easy access to the shock mount and provide adequate support for handling.

Step 2: Remove the Old Shock (if applicable)

If you are replacing an old rear shock, start by removing it using a 5mm and 8mm Allen wrench. Loosen the bolts securing the shock at both the upper and lower mount. Once the bolts are removed, carefully slide the shock out of its mount.

Step 3: Install the New Bomber CR Trunnion Rear Shock

Position the Bomber CR Trunnion Rear Shock into the mount. Ensure that the trunnion mount aligns with the corresponding mounts on the frame and the shock. Install the mounting bolts and tighten them to the manufacturer’s torque specifications (typically around 10-15 Nm). Make sure that the shock is seated correctly in the mounts to avoid any unwanted movement during riding.

Step 4: Set the Air Pressure

Attach a shock pump to the air valve on the Bomber CR Trunnion Rear Shock. Set the air pressure according to your weight and riding preferences, usually between 180-250 psi, depending on the rider’s weight and the intended riding style.

Step 5: Check for Proper Installation

Before riding, check the shock for any signs of misalignment, loose bolts, or air leaks. Ensure that the shock is securely installed and that there are no unusual noises when compressing it.

Adjusting the Bomber CR Trunnion Rear Shock

The Bomber CR Trunnion Rear Shock features multiple adjustments to optimize performance based on your riding style and terrain.

Rebound Adjustment

The rebound adjustment controls the speed at which the shock returns to its original position after compression. Adjusting this setting allows you to fine-tune the suspension’s response to bumps and obstacles on the trail.

  • Turn the rebound knob clockwise to slow down the return speed.
  • Turn the rebound knob counterclockwise to increase the speed of return.

Start with the manufacturer’s recommended settings and adjust from there based on your personal preferences. A slower rebound can provide more control in rough terrain, while a faster rebound allows for a quicker recovery on smoother trails.

Compression Adjustment

Compression adjustment controls the firmness of the shock under load, such as when riding over large bumps. The Bomber CR Trunnion offers both low-speed and high-speed compression adjustments.

  • Low-speed compression is ideal for smaller bumps and terrain features. Use this setting to fine-tune the shock’s response during slower, technical maneuvers.
  • High-speed compression is designed for bigger impacts, such as landing jumps or riding over larger obstacles. Adjust this setting to provide more resistance for high-impact scenarios.

Start with the recommended settings and adjust based on trail conditions. For smoother trails, reduce compression for a plush ride, while stiffer settings will handle aggressive trails and high-speed riding more effectively.

Maintaining the Bomber CR Trunnion Rear Shock

Routine maintenance is essential to keep the Bomber CR Trunnion Rear Shock performing at its best. Regular cleaning, lubrication, and fluid checks will ensure smooth functionality and extend the lifespan of your shock.

Cleaning the Shock

After every ride, especially after riding in muddy or wet conditions, clean the shock with a clean rag. Wipe down the shock body and trunnion mount to remove any dirt or debris. Avoid using harsh chemicals or high-pressure water as this can damage the shock components.

Servicing the Shock

Over time, the internal components of the shock will require servicing. Depending on your usage, it’s recommended to service the Bomber CR Trunnion every 100-150 hours of riding. This involves disassembling the shock, cleaning internal components, and replacing suspension fluid and seals as necessary.

  1. Remove the shock from the bike using the same steps outlined in the installation section.
  2. Disassemble the shock carefully, noting the order of components as you remove them.
  3. Clean all parts thoroughly with a clean rag. Inspect the shock for any signs of wear or damage.
  4. Replace seals and reassemble the shock, using new suspension fluid as specified by Marzocchi.
  5. Reinstall the shock back on your bike and check for proper function.

Air Spring Maintenance

The air spring in your Bomber CR Trunnion may require periodic maintenance. If you notice the shock losing air pressure or feeling inconsistent, it could indicate an air spring issue. Use a shock pump to check the pressure and top it off if necessary.

Oil Changes and Seals

Changing the oil in the Bomber CR Trunnion Rear Shock every 100-150 hours of riding helps maintain smooth damping performance. During this maintenance, it’s crucial to replace the seals to ensure the shock remains airtight and functions properly.

Troubleshooting Common Issues with the Bomber CR Trunnion Rear Shock

Air Leaks

Air leaks can cause the shock to lose pressure, resulting in inconsistent performance. Check the air valve for any signs of damage or leakage. If the shock continues to lose pressure, it may be necessary to replace the seals.

Poor Rebound or Compression Performance

If you notice the shock’s rebound or compression adjustments are not responding correctly, it could be due to internal wear or a need for a fluid change. Perform a thorough service of the shock, paying close attention to the condition of the seals and suspension fluid.

Noisy Shock

Unusual noises coming from the shock, such as squeaking or clunking, could indicate a lack of lubrication, damaged seals, or dirt buildup in the shock body. Cleaning the shock and applying a small amount of synthetic grease to the mounting points can often resolve these issues.

Customization and Optimization for Better Performance

The Bomber CR Trunnion Rear Shock is highly customizable, allowing riders to adjust settings to suit different riding styles and terrain conditions. To optimize your ride:

  • Adjust air pressure based on your weight and riding style for the best performance.
  • Tweak the compression and rebound settings to find a balance between comfort and control.
  • Regularly service the shock to ensure it’s functioning at its best, especially if you’re riding in harsh conditions or logging long hours on the bike.

Additionally, pairing the Bomber CR Trunnion Rear Shock with a compatible fork can provide a well-balanced suspension system, further enhancing your bike’s handling and performance.

Compatibility with Other Drivetrain Components

The Bomber CR Trunnion Rear Shock is compatible with a wide range of bike frames and other drivetrain components. It is important to check the shock’s specifications to ensure it fits your frame properly, especially with regards to the trunnion mount. Additionally, the shock’s performance can be optimized by pairing it with a compatible front fork and drivetrain system, ensuring a seamless suspension setup for the entire bike.

In conclusion, maintaining your Bomber CR Trunnion Rear Shock involves regular checks, adjustments, and servicing to ensure optimal performance. By following this guide, you can keep your shock running smoothly, ensuring a more enjoyable and responsive ride.