The Bomber CR Trunnion [paid link] rear shock from Marzocchi represents the pinnacle of performance and durability in rear shock design. It combines advanced technologies with a rugged [paid link], user-focused approach to suspension tuning. This article provides a thorough guide on how to install, adjust, maintain, and optimize your Bomber CR Trunnion [paid link] rear shock, ensuring your ride remains smooth, responsive, and capable of tackling any terrain.

Installation of the Bomber CR Trunnion Rear Shock

Installing the Bomber CR Trunnion rear shock requires precision and attention to detail. The installation process is straightforward if you follow the steps carefully. Ensuring the shock is mounted securely will maximize performance and ensure rider safety.

Tools Required:

• 5mm Allen wrench [paid link]
• Torque wrench [paid link]
• Trunnion mount adapter (if applicable)
• Suspension grease

Installation Steps:

1. Preparation: Clean the mounting area of the bike frame and shock. Ensure that no debris or dirt is present to prevent contamination of the shock during installation.
2. Apply Grease: Lightly grease the shock’s mounting hardware and bushings to prevent wear and ensure smooth movement.
3. Mount the Shock: Position the shock in the rear triangle of your bike frame, ensuring the trunnion mounts align with the shock’s mounting hardware. Insert the hardware through the mounts and tighten them with the 5mm Allen wrench [paid link].
4. Torque Specifications: Use the torque wrench [paid link] to tighten the bolts to the manufacturer’s recommended specifications (usually found in the owner’s manual). Over-tightening can damage the shock or the frame, while under-tightening can lead to the shock becoming loose during use.
5. Check Alignment: Ensure the shock is properly aligned and seated in the trunnion mount. Verify there is no binding when the suspension is compressed.

Adjusting the Bomber CR Trunnion Rear Shock

The Bomber CR Trunnion is built to offer precise and customizable adjustments. The shock features a range of tunability, allowing riders to adapt the shock to their unique riding style and terrain.

Key Adjustment Features:

• Rebound Damping: Controls the speed at which the shock returns to its original position after compression. A slower rebound rate is useful for aggressive riding or rough terrain, while a faster rebound setting can enhance pedaling efficiency and smoothness on moderate trails.
• Compression Damping: Adjusts how much the shock resists compression. A higher compression setting is ideal for handling large drops or jumps, while a lower setting provides better comfort and traction on smoother terrain.
• Air Pressure: The Bomber CR Trunnion uses a negative air spring to reduce fatigue and increase traction. The correct air pressure ensures that the shock performs optimally, giving you a controlled, responsive ride.

Adjustment Steps:

1. Set the Air Pressure: Begin by setting the air pressure in the shock’s positive chamber according to your weight and riding style. For standard riding, aim for a setting that provides approximately 25-30% sag.
2. Adjust Rebound Damping: Turn the rebound adjustment knob to adjust the shock’s return speed. Start with a mid-range setting and fine-tune it based on your preferences and the terrain.
3. Set Compression Damping: Adjust the compression damping to achieve the right balance between comfort and performance. More compression damping is ideal for aggressive riding and jumps, while less is better for smooth trails and comfort.
4. Test Ride and Fine-Tune: After setting the initial adjustments, test ride your bike on a trail with varied terrain. Make small adjustments to fine-tune the shock’s performance.

Maintenance of the Bomber CR Trunnion Rear Shock

Routine maintenance is essential to ensure that the Bomber CR Trunnion rear shock continues to perform at its best for years. Regular servicing will prevent wear, maintain smooth performance, and extend the life of the shock.

Key Maintenance Tips:

• Clean the Shock Regularly: After each ride, clean the shock with a soft cloth to remove dirt, dust, and debris. Avoid using harsh chemicals, as they may damage the shock’s seals.
• Inspect the Shock for Leaks: Periodically check for any air or oil leaks around the seals and valves. If you notice any signs of leaking, the shock may need to be serviced.
• Lubricate the Shock’s Bushings: Lubricate the bushings at the mounting points to ensure smooth suspension movement and prevent corrosion.
• Check Air Pressure: Air pressure can fluctuate over time, especially with temperature changes. Regularly check and adjust the air pressure to maintain the optimal sag.

Servicing:

• Spring and Oil Changes: Over time, the air spring and damping fluid may need to be replaced. If you notice decreased performance or increased noise, it might be time for a full service.
• Seal Replacement: The seals can wear out with regular use, so be sure to replace them as needed to maintain optimal performance and prevent dirt from entering the shock.

Troubleshooting Common Issues with the Bomber CR Trunnion Rear Shock

Understanding common issues with the Bomber CR Trunnion rear shock can help you quickly resolve any problems and maintain a smooth ride. Here are a few common issues and their solutions:

1. Lack of Rebound Control

• Problem: If the shock does not return smoothly or too slowly after compression.
• Solution: Check the rebound damping setting. If it’s too slow, increase the rebound setting. If it’s too fast, decrease the rebound.

2. Bottoming Out

• Problem: The shock bottoms out frequently, especially on aggressive descents.
• Solution: Increase the compression damping or adjust the air pressure. Ensure the sag is set correctly to avoid bottoming out under heavy loads.

3. Squeaking or Noisy Shock

• Problem: Persistent noise from the shock during use.
• Solution: Inspect the shock for dirt or debris, clean it thoroughly, and lubricate the bushings. If the noise persists, check for worn seals or internal damage.

Customizing the Bomber CR Trunnion Rear Shock for Optimal Performance

Customizing your Bomber CR Trunnion rear shock involves adjusting the various settings to suit your personal preferences and riding conditions. Fine-tuning these adjustments can make a significant difference in performance.

Key Customization Tips:

• Sag Setting: The correct sag setting is crucial for optimizing performance. Generally, a sag of 25-30% will give you a balanced ride. Adjust based on your weight and riding style.
• Compression and Rebound Settings: Riders who focus on downhill riding will benefit from a firmer compression setting, while those who prefer cross-country riding may opt for a more plush and forgiving setup. Adjust the rebound accordingly for smooth transitions between compressions.
• Air Pressure: Experiment with different air pressure levels to find the ideal balance between support and comfort. Higher pressure will provide a firmer ride, while lower pressure offers more comfort and compliance.

Comparing the Bomber CR Trunnion with Similar Models

While the Bomber CR Trunnion is a top-tier rear shock, it’s always important to understand how it compares with other similar models. Comparing features such as adjustability, air spring design, and damping capabilities will help you choose the right shock for your bike.

• Fox Float X2 vs Bomber CR Trunnion: The Fox Float X2 is another high-performance rear shock with excellent adjustability. While the Float X2 has more intricate tuning options, the Bomber CR Trunnion offers a more robust and simple design, making it ideal for riders who prioritize durability and ease of maintenance.
• RockShox Super Deluxe vs Bomber CR Trunnion: The RockShox Super Deluxe offers similar customization, but the Bomber CR Trunnion is designed with Marzocchi’s unique damping technologies, offering a slightly firmer feel and more responsive feedback.

Compatibility with Other Drivetrain Components

When choosing a rear shock, compatibility with your bike’s other components is essential. The Bomber CR Trunnion is compatible with most modern mountain bike frames, especially those using a trunnion mount. However, it’s crucial to check that the shock’s travel, air pressure, and mounting specifications match the frame’s design.

• Trunnion Mount Compatibility: Ensure that your bike frame is designed to accommodate a trunnion-mount shock. Some frames may require additional adapters to fit certain shock designs.
• Suspension Travel: The Bomber CR Trunnion rear shock is available in various travel lengths, so be sure to select the correct travel for your frame to achieve proper suspension geometry.

By understanding the intricacies of the Bomber CR Trunnion rear shock, you can maximize its performance and ensure it remains a key component in your bike’s suspension system for years to come.