The Bomber Air Trunnion [paid link] Rear Shock by Marzocchi has become a popular choice among cyclists looking to improve their mountain bike’s performance. This shock offers a unique blend of comfort, durability, and adjustability, making it an attractive option for both competitive riders and recreational cyclists. In this article, we will dive deep into the features, installation, adjustment, maintenance, and troubleshooting of the Bomber Air Trunnion [paid link] Rear Shock, as well as compare it to its competitors. We will also discuss its compatibility with other drivetrain components to help you make an informed decision.

Key Features of the Bomber Air Trunnion Rear Shock

The Bomber Air [paid link] Trunnion is a high-performance rear shock designed for aggressive trail and enduro riding. Here are some of the standout features:

• Trunnion Mounting System: This system provides more consistent performance throughout the shock’s stroke by distributing forces more evenly, resulting in better responsiveness and control.
• Dual Pistons: The shock is equipped with dual pistons, offering better damping control and reducing heat buildup during long rides or aggressive use.
• Air Spring Technology: The Bomber Air [paid link] utilizes an air spring for weight savings and customizable ride feel. This gives riders the flexibility to adjust the air pressure to match their riding style and terrain.
• Adjustable Damping: The shock features adjustable rebound and compression damping, allowing riders to fine-tune the performance to suit various conditions and riding preferences.
• Durable Construction: Built with Marzocchi’s signature durability, the Bomber Air is designed to withstand rough riding conditions and provide reliable performance over time.

Installation and Setup

Installing the Bomber Air Trunnion Rear Shock is a straightforward process, but it requires precision to ensure optimal performance. Here is a step-by-step guide for installation:

Tools Required

• Torque wrench [paid link]
• 5mm and 6mm Allen wrenches [paid link]
• 10mm socket wrench
• Shock pump
• Rags (to clean components)
• Grease (for mounting hardware)

Installation Steps

1. Prepare the Bike: Before installing the shock, make sure your bike is properly positioned on a stand. Remove the rear wheel to gain access to the shock mounting points.
2. Remove Old Shock: If you are replacing an old shock, carefully remove the mounting bolts with a 5mm or 6mm Allen wrench [paid link]. Take note of the orientation of the shock, as it may differ depending on your bike model.
3. Install the Bomber Air Trunnion Shock: Position the Bomber Air Trunnion shock in the mounting area. Align the trunnion mount with the frame’s designated shock mount points. Insert the mounting bolts and tighten them to the manufacturer’s recommended torque setting using a torque wrench [paid link].
4. Inflate the Shock: Attach a shock pump to the valve and adjust the air pressure to match your rider weight and intended riding style. Refer to the manufacturer’s guide for suggested pressures based on your weight and preferred setup.
5. Test the Suspension: Before riding, compress the shock a few times by pushing down on the bike to ensure the shock is properly seated and functioning smoothly.

Adjustment and Tuning

The Bomber Air Trunnion shock offers multiple adjustments that allow you to fine-tune the performance to suit your needs. These include compression damping, rebound damping, and air pressure. Here is a breakdown of how to adjust each:

Compression Damping

Compression damping controls how quickly the shock compresses when it hits a bump. For aggressive riding, increase the compression damping to prevent bottoming out. If you prefer a more supple feel, decrease the compression damping.

1. Turn the knob or dial to adjust the compression. Turning clockwise increases compression, while turning counterclockwise reduces it.
2. Start with the factory settings and adjust from there based on your riding style and terrain.

Rebound Damping

Rebound damping affects how quickly the shock extends after compression. Adjust this to control how fast the shock returns to its original position after hitting a bump or drop.

1. Turn the rebound knob to the right (clockwise) to slow down the rebound, and to the left (counterclockwise) to speed it up.
2. If the shock is rebounding too quickly and causing a “bucking” sensation, slow the rebound down. If the shock feels sluggish, speed it up slightly.

Air Pressure

Adjusting the air pressure allows you to customize the shock’s spring rate. The correct pressure depends on rider weight and personal preference.

1. Use a shock pump to adjust air pressure. The recommended range will be listed in the user manual, but typically, riders should aim for air pressures that offer a 30-35% sag for trail and enduro riding.
2. Adjust the air pressure depending on whether you want a firmer or softer feel.

Maintenance Tips

Proper maintenance is essential to ensure the longevity and performance of the Bomber Air Trunnion rear shock. Here are some tips:

• Clean Regularly: After each ride, clean the shock with a rag to remove dirt and debris. This helps prevent wear on seals and ensures smooth operation.
• Check Air Pressure: Regularly check and adjust the air pressure, as it can fluctuate over time. Consistent air pressure ensures optimal shock performance.
• Inspect Seals and Bushings: Inspect the shock’s seals and bushings periodically for any signs of wear. If you notice any leakage or poor performance, it may be time to replace the seals or take the shock in for servicing.
• Lubricate the Mounting Hardware: Periodically lubricate the shock’s mounting hardware to prevent creaking and to ensure smooth operation.

Troubleshooting Common Issues

If you’re encountering issues with your Bomber Air Trunnion rear shock, here are some common problems and their solutions:

Loss of Air Pressure

If the shock feels softer than expected or you notice sagging, it may be due to a loss of air pressure.

• Solution: Use a shock pump to check and adjust the air pressure. If the pressure continues to drop, inspect the shock for any air leaks or damage.

Bottoming Out

If the shock bottoms out too easily, it may indicate too little compression damping or too low air pressure.

• Solution: Increase the compression damping by turning the dial clockwise. Additionally, check the air pressure and ensure it is set to the correct level.

Rebound Issues

If the shock is either too bouncy or too slow to return to its original position, it may be due to improper rebound damping settings.

• Solution: Adjust the rebound damping knob to fine-tune the shock’s return speed. Start with small adjustments and test ride between each one.

Comparison with Other Rear Shocks

When compared to other high-performance rear shocks, such as the Fox Float X2 and the RockShox Super Deluxe, the Bomber Air Trunnion stands out in several ways:

• Price: The Bomber Air Trunnion is often more affordable than its competitors while still offering high-end features like adjustable damping and air spring technology.
• Ease of Use: Marzocchi has made the Bomber Air Trunnion easier to adjust, even for beginners, compared to the more complex setups of the Fox Float X2 or the RockShox Super Deluxe.
• Performance: While all three shocks offer excellent performance, the Bomber Air excels in mid-range support and overall reliability for aggressive riders. The Fox Float X2 and RockShox Super Deluxe may be better for riders who demand ultra-smooth performance and high-end tuning capabilities.

Compatibility with Other Drivetrain Components

The Bomber Air Trunnion shock is compatible with a wide range of mountain bike frames and drivetrain systems. However, it’s important to ensure that the shock’s specifications match the design and geometry of your frame. The trunnion mounting system is common in many modern enduro and trail bikes, but always double-check compatibility before purchasing.

Additionally, ensure that the shock’s travel and sag align with the other suspension components, such as the front fork, for a balanced riding experience.

Conclusion

The Bomber Air Trunnion Rear Shock by Marzocchi offers a unique combination of performance, durability, and affordability. Its adjustable damping and air spring technology make it a versatile [paid link] option for riders looking to fine-tune their ride. Compared to its competition, the Bomber Air Trunnion offers solid performance and ease of use at a more accessible price point. By understanding its installation, adjustment, maintenance, and troubleshooting, riders can get the most out of this shock and enjoy improved suspension performance on a variety of trails and terrains.