Upgrading Your Suspension with Bomber CR Trunnion Rear Shocks

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Suspension is one of the most critical components for any serious cyclist, particularly when riding on rough terrain. The Marzocchi Bomber CR Trunnion [paid link] Rear Shock provides outstanding performance for aggressive riders and those looking for a superior ride. This guide will provide in-depth instructions on installing, adjusting, maintaining, troubleshooting, and optimizing your Bomber CR Trunnion [paid link] Rear Shock for peak [paid link] performance. It will also compare it with similar models to help you make an informed decision.

Tools Required

  • 8mm Allen wrench [paid link]
  • Torque wrench [paid link]
  • Shock pump
  • Isopropyl alcohol or degreaser
  • Soft cloth or rag
  • 10mm spanner
  • 2mm and 3mm Allen wrenches [paid link] (for minor adjustments)

Installation of the Bomber CR Trunnion Rear Shock

Installing the Marzocchi Bomber CR Trunnion Rear Shock is relatively straightforward, but attention to detail is crucial for ensuring optimal performance. Follow these steps to install your rear shock correctly:

  1. Prepare the frame: Begin by cleaning the area where the shock will be mounted. Use isopropyl alcohol or degreaser to remove any dirt or debris from the frame’s rear triangle.
  2. Position the shock: Align the Bomber CR Trunnion Rear Shock with the shock mount on the frame. Make sure the shock’s eyelets are correctly positioned in relation to the trunnion mount.
  3. Insert the mounting hardware: Slide the mounting hardware through the shock’s eyelets and attach the shock to the frame. Ensure the hardware is properly aligned and that there are no gaps.
  4. Tighten the bolts: Using an 8mm Allen wrench [paid link], tighten the bolts to the manufacturer’s recommended torque specifications. For the Bomber CR Trunnion Rear Shock, this is typically around 8-10 Nm.
  5. Secure the trunnion bolts: Tighten the trunnion bolts using the appropriate torque setting (10-12 Nm) to secure the shock firmly in place.
  6. Double-check the fit: Ensure that the shock is fully seated and that there is no play in the mounting area. Perform a final check to make sure all bolts are tightened properly.

Adjusting the Bomber CR Trunnion Rear Shock

One of the standout features of the Bomber CR Trunnion Rear Shock is its adjustability. Marzocchi offers fine-tuned controls that allow you to adjust for different riding conditions, rider weight, and personal preferences.

Air Pressure Adjustment

  1. Measure your sag: First, set the air pressure by measuring the sag. The ideal sag is typically around 30% of the total shock travel, which can be adjusted by using a shock pump.
  2. Adjust the air pressure: Attach the shock pump to the air valve and adjust the pressure based on your body weight and riding style. For most riders, this will be between 200-300 PSI.

Rebound Adjustment

  1. Locate the rebound dial: On the Bomber CR, the rebound adjuster is typically located at the bottom of the shock. This dial controls the rate at which the shock extends after compression.
  2. Fine-tune the rebound: Turn the dial to adjust the rebound. A faster rebound setting will make the shock return quickly, while a slower rebound will give you a smoother and more controlled ride. Start with a mid-range setting and adjust based on the terrain.

Compression Adjustment

  1. Set the compression: The Bomber CR Trunnion also features a low-speed compression dial, which allows you to adjust the firmness of the shock under low-speed compression. Turn the dial clockwise to increase compression, providing a firmer feel, or counterclockwise to decrease it for more plushness.
  2. Adjust for terrain: For smoother trails, decrease the compression for a more forgiving ride. For technical or rocky terrain, increase the compression for better support.

Maintenance of the Bomber CR Trunnion Rear Shock

Regular maintenance is key to ensuring that your Marzocchi Bomber CR Trunnion Rear Shock continues to perform at its best. Follow these steps for routine maintenance:

  1. Clean the shock: After every ride, wipe down the shock with a clean, soft cloth to remove dirt and grime. This will prevent contaminants from entering the shock’s internals.
  2. Inspect the shock: Check the shock for any visible damage, such as scratches, dents, or leaks. Pay special attention to the seals, as these are crucial for maintaining air pressure.
  3. Lubricate the shock: Apply a small amount of lubricant to the shock’s air canister and piston shaft to keep it running smoothly.
  4. Service the shock annually: It is recommended to have the Bomber CR Trunnion Rear Shock serviced once a year. This involves draining the air, inspecting internal components, and replacing worn seals to ensure optimal function.

Troubleshooting Common Issues with the Bomber CR Trunnion Rear Shock

While the Bomber CR Trunnion Rear Shock is designed for durability, issues can arise. Below are some common problems and their solutions:

1. Shock Bottoming Out

  • Cause: Insufficient air pressure or excessive sag.
  • Solution: Increase air pressure to achieve the proper sag. Aim for around 30% of the shock’s travel.

2. Excessive Rebound Speed

  • Cause: Rebound is set too fast.
  • Solution: Slow down the rebound by turning the rebound dial clockwise to slow down the shock’s extension.

3. Leaking Air

  • Cause: Worn seals or improper maintenance.
  • Solution: Check for any air leaks around the seals and ensure the shock is properly serviced annually. If air leaks persist, replace the seals or send the shock to Marzocchi for professional servicing.

Customization and Optimization for Better Performance

To get the most out of your Bomber CR Trunnion Rear Shock, consider these customization and optimization tips:

  1. Fine-tune the settings for your riding style: Adjust the air pressure, compression, and rebound based on your specific needs. For aggressive downhill riders, increase the compression for a firmer feel, while lighter riders or those on smoother trails might want a more plush setting.
  2. Consider upgrading the spring: If you’re riding in extreme conditions, consider a higher-quality spring that offers better performance under heavier loads.
  3. Weight optimization: Use lighter components for your bike to further enhance the performance of your suspension system. The Bomber CR works well with lightweight frames and tires, which helps keep the overall weight down without compromising stability.

Comparison with Similar Models

While the Bomber CR Trunnion Rear Shock stands out for its durability and adjustability, it’s helpful to understand how it compares to other models in the market.

  • Fox DHX2: The Fox DHX2 is another popular rear shock, known for its precision and tuning options. However, the Bomber CR offers a more affordable alternative with similar performance in aggressive riding conditions.
  • RockShox Super Deluxe: Known for a slightly smoother ride, the RockShox Super Deluxe excels in comfort and damping. The Bomber CR, on the other hand, offers a more responsive, tunable ride, making it a better choice for riders who prioritize performance over comfort.

Compatibility with Other Drivetrain Components

The Bomber CR Trunnion Rear Shock is compatible with most modern mountain bike frames, especially those with a trunnion mount design. It pairs well with other Marzocchi and Fox components, and while it is generally versatile [paid link], it’s important to verify compatibility with your specific frame before installation. Always check your bike’s geometry and ensure that the shock’s dimensions and mount type align with your frame’s specifications.