Is the Bomber CR Coil the Best Rear Shock for Mountain Bikes?

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The Marzocchi Bomber CR Coil [paid link] rear shock is a high-performance component designed to offer superior damping and suspension capabilities for mountain biking enthusiasts. Known for its durability and versatile [paid link] performance, the Bomber CR Coil [paid link] is widely considered one of the top choices for riders seeking a coil shock that can withstand harsh trails and provide excellent ride quality. In this detailed guide, we will cover the installation, adjustment, maintenance, troubleshooting, customization, and performance optimization of the Bomber CR Coil. Additionally, we will compare it with similar models to help riders make an informed decision.

Tools Required

  • 8mm and 10mm hex wrenches
  • Torque wrench [paid link] (with recommended torque settings)
  • Shock pump
  • Oil or suspension grease
  • Clean cloth
  • Flathead screwdriver
  • Compression and rebound adjustment tools (if applicable)

Installation of the Bomber CR Coil Rear Shock

Installing the Bomber CR Coil rear shock on your mountain bike requires careful attention to detail to ensure proper setup and optimal performance.

  1. Prepare the Bike and Shock: Begin by cleaning the bike frame’s rear shock mount area to remove any dirt or debris. Apply a small amount of suspension grease to the shock’s mounting bolts to ensure smooth installation and prevent seizing.
  2. Mount the Shock: Insert the Bomber CR Coil shock into the rear suspension mount on your bike’s frame. Ensure that the shock’s eyelet is properly aligned with the mounting holes. Tighten the bolts to the recommended torque settings (usually 8–10Nm). Double-check the alignment of the shock to ensure it’s installed securely.
  3. Install the Coil Spring: The Bomber CR Coil is equipped with a preload adjustable coil spring. Place the coil onto the shock body and secure it in place by tightening the preload collar. Make sure the spring is centered and fully seated.
  4. Recheck Installation: Before using the bike, recheck all bolts and components for proper torque. Ensure there is no movement or play in the shock. Also, verify the coil spring is properly tensioned according to your rider weight.

Adjustment of the Bomber CR Coil Rear Shock

The Bomber CR Coil features adjustable settings that allow you to fine-tune the performance based on your riding style and terrain. Proper adjustment is key to maximizing the shock’s efficiency.

1. Sag Setup

Sag is the amount the rear shock compresses under the rider’s weight. Setting the correct sag ensures optimal suspension performance.

  • Use a shock pump to adjust the air pressure or preload in the coil spring.
  • Ideally, you want around 25-30% of the shock’s travel to be used when you’re sitting on the bike.
  • Measure the amount of sag by marking the shock’s stanchion and measuring the difference with and without weight.

2. Rebound Damping

Rebound damping controls how quickly the shock returns to its fully extended position after compression.

  • Locate the rebound adjustment knob on the shock body.
  • Turn the knob to adjust the rebound speed. For smoother and slower rebound, turn the knob clockwise. For faster rebound, turn it counterclockwise.
  • Test the rebound by cycling through the shock a few times to see how it responds to various terrain.

3. Compression Damping

Compression damping controls how the shock reacts to impacts and compression forces.

  • Adjust the compression damping by turning the knob (usually located near the spring or reservoir).
  • Clockwise adjustments increase compression, offering more resistance to compression forces, which is ideal for aggressive riders or rough terrain.
  • Counterclockwise adjustments provide a softer ride, allowing the shock to compress more easily, which is suitable for smoother trails.

Maintenance of the Bomber CR Coil Rear Shock

Regular maintenance is essential to keep the Bomber CR Coil performing at its best. The shock should be inspected and maintained at least once a season or after every major trail ride.

  1. Cleaning: After each ride, use a clean cloth to wipe down the shock and remove any dirt, mud, or debris that may have accumulated. Pay special attention to the shock’s seals and stanchion.
  2. Lubrication: Apply suspension grease to the shock’s bushings and mounting hardware to prevent wear and corrosion. Be sure to lubricate the coil spring if necessary.
  3. Air Pressure Check: Ensure that the coil spring has proper tension and preload, adjusting with a shock pump as necessary.
  4. Seal Inspection: Periodically check the shock’s seals for any signs of wear, leaks, or damage. If oil leakage is observed, it’s time to replace the seals.
  5. Full Servicing: For deeper maintenance, like oil changes or damper rebuilds, it’s recommended to send the shock to a professional suspension service center. Full servicing is typically required once per year depending on riding conditions.

Troubleshooting Common Set-Up Issues

While the Bomber CR Coil rear shock is designed for durability and easy maintenance, occasional setup issues may arise. Here’s how to troubleshoot them:

  1. Too Much Sag: If you notice that the rear shock is sagging too much under your weight, increase the preload or adjust the coil spring’s tension. Make sure the coil is properly seated on the shock.
  2. Excessive Rebound: If the shock feels like it’s returning too quickly, decrease the rebound damping by turning the knob clockwise. Ensure that there’s no excessive movement in the shock after landing from drops or rough terrain.
  3. Noisy Shock: If you hear squeaks or rubbing sounds, ensure the shock’s mounting bolts are tight and that there is no dirt or debris around the shock’s moving parts. Clean and lubricate the suspension parts regularly to prevent buildup.
  4. Lack of Travel: If the shock isn’t utilizing its full travel, it might be due to incorrect sag settings or improper coil spring preload. Recheck the sag and adjust accordingly.

Customization and Optimization for Better Performance

The Bomber CR Coil is a versatile [paid link] shock that can be optimized for different riding styles and conditions. Here are some tips for customizing its performance:

  1. Change Coil Spring: If you find that the stock coil spring is too stiff or too soft for your riding weight, you can swap it for a different spring rate. Marzocchi offers various spring rates, and selecting the right one can improve both comfort and performance.
  2. Tune Compression and Rebound: Fine-tune the compression and rebound settings for the specific trails you ride. On smoother trails, a softer setting may provide more comfort, while on rougher terrain, firmer settings will help with control.
  3. Upgrade Shock Oil: For riders seeking a smoother, more responsive ride, upgrading the shock oil can improve performance. Higher-quality oils reduce friction and improve the shock’s responsiveness.

Comparison with Similar Models

The Bomber CR Coil competes with other high-performance coil rear shocks in the market, such as the RockShox Super Deluxe Coil and Fox DHX2. Here’s how they compare:

  • Performance: The Bomber CR Coil offers a solid performance-to-price ratio, making it ideal for riders looking for a durable, high-quality rear shock without breaking the bank. The Super Deluxe Coil and Fox DHX2 offer similar performance but may come at a higher cost.
  • Adjustability: All three models feature adjustable rebound and compression settings, but the Bomber CR Coil is often noted for its user-friendly design and ease of adjustment.
  • Durability: The Bomber CR Coil is built with rugged [paid link] durability in mind, capable of handling aggressive riding and rough terrain. It stands toe-to-toe with the Fox DHX2 in terms of resilience and longevity.
  • Weight: The Bomber CR Coil is slightly heavier compared to some air shocks like the RockShox Deluxe RT3, but the added weight comes with the benefit of consistent performance, particularly on longer descents.

Compatibility with Other Drivetrain Components

When considering the Bomber CR Coil for your bike, it’s important to ensure that it’s compatible with the rest of your drivetrain components. The Bomber CR Coil is designed to work seamlessly with most modern mountain bike frames, especially those built for long travel and aggressive riding.

However, it’s important to verify that your bike frame supports coil shock suspension. Some lightweight frames may be designed for air shocks, and installing a coil shock like the Bomber CR Coil could lead to clearance or weight issues. Always consult your bike’s manufacturer specifications to confirm compatibility.

Conclusion

The Marzocchi Bomber CR Coil is a highly capable and durable rear shock that offers excellent value for mountain bikers seeking top-tier suspension performance. With its adjustable settings, ease of maintenance, and customization options, it is a top contender for aggressive riders who need a dependable coil shock. While it may not be the lightest or most expensive option, its performance on demanding trails makes it an excellent choice for riders who prioritize comfort, durability, and consistent performance.