The Bomber CR Trunnion [paid link] Rear Shock by Marzocchi has earned a stellar reputation among mountain bikers for its durability, performance, and ease of use. As a key component of the rear suspension system, this shock provides unparalleled control and comfort for riders seeking a smooth and responsive ride. In this guide, we will walk through the installation, adjustment, maintenance, and optimization of the Bomber CR Trunnion [paid link] Rear Shock. Additionally, we’ll explore troubleshooting tips, compatibility considerations, and how it compares to similar models on the market.

Installation of the Bomber CR Trunnion Rear Shock

Installing the Bomber CR Trunnion Rear Shock is a straightforward process, but it requires careful attention to detail to ensure proper functionality and safety. Below is a step-by-step guide to properly install the shock onto your bike.

Tools Required

• 5mm Allen wrench [paid link]
• Torque wrench [paid link] (recommended torque: 200-220Nm)
• 10mm socket wrench
• Suspension grease
• Trunnion mounting hardware (typically included with the shock)

Installation Steps

1. Prepare the Bike Frame
   Ensure the rear triangle of the frame is clean and free from any dirt or debris. Inspect the mounting points for wear, cracks, or other damage.
2. Grease the Mounting Hardware
   Apply a light layer of suspension grease to the mounting hardware to prevent seizing or creaking over time. Grease also helps in reducing friction between the shock and frame.
3. Position the Shock
   Line up the trunnion mount of the shock with the mounting points on your frame. Make sure the shock’s orientation matches your bike’s geometry.
4. Install the Mounting Bolts
   Insert the bolts into the trunnion mount on both sides of the shock. Tighten the bolts manually at first to ensure they’re in place.
5. Torque the Bolts
   Use a torque wrench [paid link] to tighten the bolts to the recommended specifications (200-220Nm). This ensures the shock is secured without being over-tightened, which could cause damage.
6. Check for Proper Fitment
   Ensure the shock is properly aligned and that there is no play in the mount. Move the suspension through its full range of motion to confirm it operates smoothly.

Adjustment of the Bomber CR Trunnion Rear Shock

The Bomber CR Trunnion Rear Shock is designed for riders who demand precision and adjustability. It comes equipped with several adjustable features to tailor the suspension to your riding style and terrain. The main adjustment options include rebound damping, compression damping, and air spring pressure.

Rebound Damping Adjustment

Rebound damping controls how quickly the shock returns to its original position after compression. Too fast, and the bike may feel unstable; too slow, and the suspension may feel harsh.

• To Adjust:
  Turn the rebound knob clockwise to slow down the rebound (less bouncy). Turn it counterclockwise to speed up the rebound (more responsive).

Compression Damping Adjustment

Compression damping adjusts how much resistance the shock offers when it is compressed. A higher compression setting is ideal for aggressive riding or rough terrain, while a lower setting offers a smoother ride on lighter trails.

• To Adjust:
  Turn the compression knob clockwise to increase the damping (stiffer). Turn it counterclockwise to decrease the damping (softer).

Air Spring Pressure

The air spring pressure determines how firm or plush the shock feels. Adjusting the air pressure allows riders to fine-tune the shock to their weight and riding style.

• To Adjust:
  Use a high-quality shock pump to increase or decrease the air pressure. The correct pressure depends on your weight and riding preference. Refer to Marzocchi’s user manual for specific air pressure recommendations based on rider weight.

Maintenance of the Bomber CR Trunnion Rear Shock

Proper maintenance is essential for ensuring the Bomber CR Trunnion Rear Shock continues to perform at its best. Regular maintenance helps prevent wear and tear and extends the lifespan of the shock.

Cleaning

• Frequency: After every ride, particularly in muddy or wet conditions.
• Steps:
  1. Use a soft cloth to wipe down the shock’s body.
  2. Check for any dirt or debris that may have accumulated around the shock’s seals.
  3. Avoid using harsh solvents or abrasives that may damage the shock’s finish.

Lubrication

• Frequency: Every 3-5 rides or as needed.
• Steps:
  1. Apply suspension-specific grease to the shock’s mounting hardware.
  2. Lubricate the seals around the shock to prevent them from drying out or cracking.

Inspection

• Frequency: Monthly or after every major ride.
• Steps:
  1. Check the shock for any visible signs of damage, such as dents, cracks, or oil leaks.
  2. Inspect the shock’s air valve and damping adjustments for smooth operation.

Troubleshooting Common Issues with the Bomber CR Trunnion Rear Shock

Even with proper care, issues can sometimes arise. Below are some common problems with the Bomber CR Trunnion Rear Shock and how to address them.

Issue 1: Shock Bottoming Out

If the shock bottoms out (compresses fully) during heavy impacts, it can cause the bike to feel harsh or uncomfortable.

• Solution:
  Increase the air spring pressure slightly to prevent bottoming out. If the issue persists, consider increasing compression damping to slow down the shock’s compression rate.

Issue 2: Poor Rebound Control

If the rebound is too fast or too slow, it can affect ride stability and comfort.

• Solution:
  Adjust the rebound damping knob to achieve the desired speed. A slow rebound can be helpful for technical descents, while faster rebound is preferable for smoother trails.

Issue 3: Leaking Air or Oil

Leaking air or oil is a sign of a damaged seal or internal issue.

• Solution:
  Inspect the seals for any visible damage. If necessary, replace the seals or take the shock to a professional for a full inspection and service.

Customization and Optimization for Better Performance

To get the most out of your Bomber CR Trunnion Rear Shock, consider these optimization tips based on your riding style and terrain.

Fine-Tuning Suspension Settings

• For Aggressive Riding: Increase compression damping to handle the high-speed impacts and rough terrain. Use a stiffer air spring pressure to provide more control.
• For Enduro or Trail Riding: A softer compression setting and lower air pressure offer more comfort and control on technical climbs and descents.
• For XC Racing: Use a stiffer compression setting and higher air pressure for a more responsive ride on smoother trails.

Weight Considerations

Adjusting the air pressure to match your body weight is crucial for maintaining the correct suspension feel. Riders should regularly check their air pressure and make adjustments based on changes in their weight (e.g., after clothing changes or a weight loss/gain).

Compatibility with Other Drivetrain Components

The Bomber CR Trunnion Rear Shock is compatible with most modern mountain bike frames and drivetrain components. However, compatibility with specific frame designs, linkage systems, and wheel sizes should be verified before purchase.

• Linkage Systems: The Bomber CR Trunnion shock is compatible with most trunnion-mounting linkage systems. Always confirm that your frame supports this type of shock before installation.
• Drivetrain Compatibility: The shock does not directly affect drivetrain compatibility, but it may influence frame choice. Ensure your bike’s rear triangle and shock specifications are compatible.

Comparison with Similar Models

When compared to other rear shocks in its class, such as the Fox Float X2 and RockShox Super Deluxe, the Bomber CR Trunnion stands out in a few key areas.

• Performance: The Bomber CR Trunnion offers a more direct and responsive feel, particularly when adjusting the compression and rebound settings. It’s ideal for riders who value a more predictable and robust performance.
• Price Point: The Bomber CR Trunnion is typically more affordable than higher-end shocks like the Fox Float X2, making it a great choice for riders on a budget who still want high-quality suspension.
• Durability: Marzocchi’s reputation for rugged [paid link] durability is reflected in the Bomber CR Trunnion, making it an excellent choice for aggressive riders who demand long-lasting, dependable performance.

The Bomber CR Trunnion Rear Shock provides excellent performance and value, making it a trusted choice for riders across various disciplines. With easy installation, precise adjustability, and simple maintenance, it stands as a reliable option for those seeking to enhance their mountain biking experience.