Is the Bomber Air Trunnion the Best Rear Shock for Mountain Bikes?

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The Marzocchi Bomber Air Trunnion [paid link] is a high-performance rear shock designed to meet the demands of aggressive mountain bikers. With a reputation for durability, reliability, and exceptional performance, it has become a popular choice for riders looking to enhance their mountain bike’s suspension. This article will provide a comprehensive guide on how to install, adjust, and maintain the Bomber Air Trunnion [paid link], troubleshoot common issues, optimize its performance, and compare it with similar models.

Installation of the Bomber Air Trunnion

Installing the Marzocchi Bomber Air [paid link] Trunnion requires precision and attention to detail. Proper installation ensures that the shock performs optimally and can handle the rigors of mountain biking.

Tools Required:

  • 8mm and 10mm Allen wrenches [paid link]
  • Torque wrench [paid link]
  • 4mm and 5mm Allen wrenches [paid link]
  • Air pump (for suspension setup)
  • Suspension grease
  • Clean rag or paper towel
  • Threadlocker (optional)

Installation Steps:

  1. Prepare the bike: Before beginning the installation, ensure your bike is stable. Use a bike stand [paid link] to secure the frame.
  2. Remove the old rear shock: If replacing an existing shock, remove it by loosening the mounting bolts using the appropriate Allen wrenches. Keep the mounting hardware as it may be reused.
  3. Prepare the Bomber Air [paid link] Trunnion shock: Apply a small amount of suspension grease to the shock bushings and mounting hardware. This will help prevent squeaks and ensure a smooth installation.
  4. Install the shock: Align the Bomber Air Trunnion with the rear suspension linkage or frame. Insert the mounting hardware into the shock eyelets, and tighten the bolts to the manufacturer’s specified torque settings.
  5. Secure the shock: Double-check that all bolts are tightened securely. A torque wrench [paid link] is essential to avoid overtightening and damaging the frame or shock.
  6. Set the air pressure: Use an air pump to set the appropriate air pressure for your weight and riding style. Refer to the Bomber Air Trunnion’s manual for recommended pressure settings.
  7. Test the installation: Cycle the suspension a few times to ensure smooth operation and check for any unwanted movement or noise.

Adjustment and Maintenance

Proper adjustments and regular maintenance are key to getting the most out of your Bomber Air Trunnion. These adjustments help you tune the shock to your specific riding preferences.

Adjusting the Compression and Rebound

  1. Compression Adjustment: The Bomber Air Trunnion comes with a high-speed and low-speed compression adjustment. High-speed compression controls the shock’s response to fast, sharp hits, while low-speed compression adjusts how the shock reacts to smoother, slower compressions.
    • To adjust, use the compression dials on the shock. Start with a neutral setting (middle of the range) and fine-tune based on your riding experience.
  2. Rebound Adjustment: Rebound controls how quickly the shock returns after compression. A slower rebound helps maintain control on rough terrain, while a faster rebound can be beneficial for smoother trails.
    • Adjust the rebound dial to suit your preference. Begin with a mid-range setting and adjust based on the ride feel.

Regular Maintenance

  • Air Pressure Check: Regularly check and adjust the air pressure in the shock. Loss of air pressure can significantly affect suspension performance.
  • Clean the Shock: After each ride, clean the shock body with a soft cloth to remove dirt and debris. Dirt can cause excessive wear on the shock seals.
  • Inspect for Leaks: Check for any oil or air leaks around the shock’s seals. Leaking seals can diminish the shock’s performance and require a rebuild.
  • Annual Rebuild: Even though the Bomber Air Trunnion is designed for durability, an annual service to replace worn-out seals and perform an oil change is recommended for optimal performance.

Troubleshooting Common Issues

While the Bomber Air Trunnion is built to be durable, it can still experience issues over time. Here are some common problems and their solutions:

Issue 1: Poor Performance or No Compression

  • Possible Cause: Low air pressure or faulty air seal.
  • Solution: Check and adjust the air pressure to the recommended setting. If the issue persists, inspect the air seal for damage and replace it if necessary.

Issue 2: Excessive Rebound or Poor Control

  • Possible Cause: Incorrect rebound setting.
  • Solution: Adjust the rebound dial to a slower setting to improve control on rough terrain.

Issue 3: Noise During Use

  • Possible Cause: Dirt or debris buildup or lack of lubrication on the shock bushings.
  • Solution: Clean the shock regularly and apply a small amount of suspension grease to the bushings.

Customization and Optimization for Better Performance

The Bomber Air Trunnion can be customized to suit different types of riding and rider preferences. Here are a few ways to optimize its performance:

Adjusting Air Pressure Based on Riding Style

  • Trail Riding: For general trail riding, set the air pressure to provide a plush ride while maintaining control on technical descents. Typically, lower pressures will offer more comfort and absorb impacts better.
  • Enduro or Aggressive Riding: Increase the air pressure slightly for more support during aggressive climbs and descents. Higher air pressure will reduce bottom-out tendencies and improve overall responsiveness.

Tuning the Compression Damping

  • Fast Downhill Runs: Increase the high-speed compression damping to prevent excessive bottoming out when hitting drops or rough terrain at high speeds.
  • Smooth Trails: For smoother, less aggressive trails, reduce compression to allow the shock to absorb smaller bumps more effectively.

Comparison with Similar Models

When choosing a rear shock, it is important to compare the Bomber Air Trunnion with similar models to ensure you select the best option for your needs.

Bomber Air Trunnion vs. Fox DPX2

  • Performance: The Bomber Air Trunnion offers a slightly more progressive shock curve, which provides better control on aggressive terrain. In contrast, the Fox DPX2 is known for its superior mid-stroke support but may feel too firm on technical climbs.
  • Weight: The Bomber Air Trunnion is a bit heavier than the DPX2, making it less ideal for riders focused on weight savings.
  • Customization: Both shocks offer a wide range of adjustments, but the Bomber Air Trunnion tends to have a broader range for fine-tuning compression settings.

Bomber Air Trunnion vs. RockShox Super Deluxe

  • Durability: The Bomber Air Trunnion is more durable and better suited for aggressive riders, while the Super Deluxe is slightly lighter and more focused on cross-country use.
  • Performance: The Bomber Air Trunnion excels on rough, technical trails, while the RockShox Super Deluxe offers a smoother ride on less challenging terrain.
  • Cost: The Bomber Air Trunnion offers excellent value for money, often coming in at a lower price point than the Super Deluxe, which might make it the better option for riders looking for a solid all-around performer without breaking the bank.

Compatibility with Other Drivetrain Components

The Bomber Air Trunnion is compatible with most modern mountain bike frames designed for trunnion-mount shocks. It is crucial to ensure that your bike’s rear suspension system supports a trunnion mount, as not all mountain bike frames do. The shock can be used with both 1x and 2x drivetrains, and its design works seamlessly with various brands and models of suspension forks. Always check your bike’s specifications before purchasing to ensure compatibility with the Bomber Air Trunnion shock.