Reviewing the Performance of Bomber CR Coil Rear Shocks

The Bomber CR Coil [paid link] rear shock from Marzocchi is a well-regarded option among riders who seek a durable, performance-oriented coil shock for aggressive trail and enduro riding. It stands out due to its simplicity, reliability, and ability to offer exceptional performance in a variety of conditions. This guide covers installation, adjustment, maintenance, troubleshooting, and optimization of the Bomber CR Coil [paid link] rear shock, helping riders maximize its potential.

Installation of Bomber CR Coil Rear Shock

Installing the Bomber CR Coil rear shock is straightforward for most riders with basic mechanical knowledge. However, precision and careful handling are crucial to ensure optimal performance and safety.

Step 1: Prepare the Bike

Lift the bike using a repair stand or have it supported securely.
Remove the rear wheel if necessary for better access to the rear shock mounting area.

Step 2: Remove the Old Shock (if applicable)

For replacing an existing shock, begin by removing the bolts securing the old shock to the frame.
Be cautious not to damage any parts during removal. You may need to use a 6mm or 8mm Allen key, depending on the fasteners.

Step 3: Position the Bomber CR Coil Shock

Place the Bomber CR Coil shock into the mounting eyelets on the rear triangle of the frame.
Align the shock correctly with the mounting holes.

Step 4: Secure the Shock

Use the appropriate bolts and washers (typically included with the shock) to secure it into place.
Tighten the bolts to the recommended torque specification, typically 15-20 Nm, to ensure they are firm but not overtightened.

Step 5: Reinstall the Rear Wheel (if removed)

After securing the shock, reinstall the rear wheel and ensure the axle is tight and properly torqued.

Step 6: Final Inspection

Double-check the installation to ensure everything is aligned correctly and tightened to specifications.

Adjustment of Bomber CR Coil Rear Shock

Adjusting the Bomber CR Coil rear shock is essential to customize its performance to match the rider’s weight, riding style, and trail conditions. The shock offers a few key adjustments for optimal setup.

Preload Adjustment

The Bomber CR Coil rear shock features an external preload adjuster that controls the initial sag or compression when the rider sits on the bike.
Adjusting the preload ensures the shock is set up to handle your body weight appropriately.
Increase preload for heavier riders or those who prefer a firmer ride. Decrease preload for lighter riders or those seeking a softer, more plush ride.

Rebound Adjustment

The rebound dial, located at the bottom of the shock, controls how quickly the shock returns after compression.
If the shock rebounds too quickly or feels “bouncy,” reduce the rebound speed by turning the dial clockwise.
If the shock feels sluggish or bottoming out too often, increase the rebound speed by turning the dial counterclockwise.

Compression Adjustment

The Bomber CR Coil shock has adjustable low-speed compression, allowing the rider to fine-tune how the shock responds to impacts.
For smoother, less aggressive terrain, soften the compression to improve traction and comfort.
For rougher, more technical trails, increase compression to prevent bottoming out during hard hits.

Maintenance of Bomber CR Coil Rear Shock

Proper maintenance ensures the Bomber CR Coil rear shock continues to perform optimally for years. Marzocchi recommends regular service intervals to maintain the shock’s internals and overall function.

Cleaning

After every ride, wipe down the shock with a clean cloth to remove dirt, mud, and debris. Pay special attention to the eyelets and the shaft to prevent dirt from entering the shock’s internals.
Avoid using pressure washers, as the high-pressure water can damage seals and internal components.

Lubrication

Lubricate the shock’s mounting bushings regularly to reduce wear and tear on the shock’s pivot points.
Apply a thin layer of grease to the shock’s bushings or use a specific suspension lube designed for coil shocks.

Air Spring Maintenance

Although the Bomber CR Coil uses a coil spring, occasional inspection of the air valve and any associated components is advised.
Check for any leakage or damage to the air valve. If any issues are found, replace the valve or consult a professional.

Coil Spring Inspection

Inspect the coil spring for signs of wear, such as cracks or deformations.
If the coil spring appears damaged or overly fatigued, replace it with a new one.

Professional Servicing

Every 100-150 hours of riding, or annually, perform a full service that includes stripping down the shock, replacing seals, and checking internal lubrication.
This task requires professional-level knowledge, and it’s advisable to send the shock to an authorized Marzocchi service center or a trusted suspension technician.

Troubleshooting Common Set-up Issues

Despite its robust design, issues can occasionally arise with the Bomber CR Coil rear shock. Below are common troubleshooting tips for resolving setup problems.

Shock Bottoming Out

If the shock is bottoming out too frequently, it might be due to inadequate preload, too low compression settings, or an overly soft spring.
Increase the preload, adjust the compression damping, or switch to a stiffer coil spring to prevent bottoming out.

Poor Rebound Control

If the shock’s rebound feels either too fast or too slow, check the rebound adjustment dial and tweak it accordingly.
If the shock continues to behave erratically, it could be a sign of internal damage or low oil levels, requiring a professional inspection.

Excessive Sag

Too much sag can indicate too little preload or an incorrect coil spring for your weight.
Adjust the preload, or if necessary, replace the coil spring with one that is more appropriate for your body weight and riding style.

Customization and Optimization for Better Performance

The Bomber CR Coil rear shock offers several ways to optimize its performance to suit specific riding needs.

Coil Spring Upgrades

Riders who regularly ride steep, technical trails with big hits may benefit from upgrading to a stiffer coil spring. This helps reduce excessive bottoming out.
Alternatively, a softer coil can be installed for more plush, trail-oriented riding that focuses on comfort and grip.

Tuning for Specific Terrain

For aggressive downhill or enduro riding, set the compression damping to a firmer setting to handle big impacts and rough terrain.
For cross-country or trail riding, a softer setup with increased rebound and lower compression damping can provide better comfort and traction on smoother terrain.

Comparison with Similar Models

The Bomber CR Coil rear shock competes with other high-performance coil shocks like the Fox DHX2 and RockShox Super Deluxe Coil. Here’s a quick comparison:

Fox DHX2: Offers more adjustment options, including high-speed compression and additional tuning features. It is slightly more expensive but provides more customization for riders seeking precision.
RockShox Super Deluxe Coil: Known for its smooth performance and ease of use, the Super Deluxe is lighter and offers a more user-friendly setup. However, it may not be as robust for aggressive downhill riding as the Bomber CR Coil.

The Bomber CR Coil excels in durability and simplicity, making it a great choice for riders who want consistent performance without the need for excessive tuning.

Compatibility with Other Drivetrain Components

The Bomber CR Coil rear shock is compatible with a wide range of mountain bike frames designed for coil shocks, especially those meant for aggressive trail and enduro riding. It works seamlessly with modern 12-speed drivetrains and is highly durable for tough terrain. However, ensure that your frame’s geometry and shock mounts are suitable for a coil shock setup, as some frames are optimized for air shocks.

Always check with your bike manufacturer for exact compatibility before upgrading to the Bomber CR Coil rear shock to ensure proper fitment and optimal performance.