The Marzocchi Bomber 58 is a high-performance suspension fork designed to handle the most aggressive trails. With its robust build and precise damping, it delivers superior control and comfort. Proper maintenance is essential to ensure optimal performance and prolong the life of your Bomber 58. This guide will walk you through the steps for installing, adjusting, and maintaining your Bomber 58 suspension fork. Additionally, we will cover common issues, troubleshooting tips, and how to customize the fork for better performance.

Installation of the Marzocchi Bomber 58

Installing the Bomber 58 suspension fork requires careful attention to detail to ensure it functions correctly and safely. Follow the steps below to install your fork properly.

Tools Required:

• 5mm and 6mm Allen wrenches [paid link]
• Torque wrench [paid link] (for precise tightening)
• Grease (preferably for bike components)
• Suspension fork oil
• Flat-head screwdriver
• Crown race installation tool
• Compression plug

Installation Steps:

1. Remove the Old Fork: If you’re replacing an existing fork, start by loosening the quick-release or through-axle on your front wheel. Remove the wheel and then use the 5mm Allen wrench [paid link] to detach the fork from the bike’s head tube.
2. Install the Crown Race: Place the new crown race on the Bomber 58’s steerer tube. Use the crown race installation tool to ensure it’s properly seated and flush with the fork’s base.
3. Insert the Fork into the Headset: Position the Bomber 58 into the bike’s headset. Make sure the fork is aligned straight in the head tube.
4. Tighten the Stem: Slide the stem over the fork’s steerer tube and tighten it using a 5mm Allen wrench [paid link]. Tighten the bolts incrementally to ensure even pressure.
5. Install the Compression Plug: If the Bomber 58 requires a compression plug, insert it into the steerer tube and tighten it securely.
6. Reattach the Front Wheel: Place your front wheel back into the fork and secure it with either a quick-release or through-axle, depending on your setup.
7. Check Alignment: Ensure the fork is aligned correctly with the wheel and headset. Tighten all bolts to the manufacturer’s recommended torque settings.

Adjustment for Optimal Performance

To get the best performance out of your Bomber 58 suspension fork, you’ll need to adjust it to suit your weight, riding style, and terrain. The fork offers various tuning options, including rebound, compression, and air pressure settings.

Adjusting the Air Pressure

1. Locate the Air Valve: The Bomber 58 uses air pressure for its fork’s main spring. Locate the air valve at the top of the left fork leg.
2. Set the Correct Air Pressure: Use a shock pump to add or release air to the fork. The recommended pressure range is listed in the user manual based on your body weight. For example, riders under 150 lbs may require lower pressure (around 70 psi), while riders over 200 lbs may need higher pressure (around 90 psi).
3. Fine-tune for Comfort: After the initial setting, test ride the fork and adjust the pressure if needed for better comfort and control.

Rebound Adjustment

1. Locate the Rebound Dial: The rebound dial is typically located at the bottom of the right fork leg.
2. Adjust the Rebound Speed: Turn the dial clockwise to slow down the rebound or counterclockwise to increase the rebound speed. Set it according to the riding terrain. Slower rebound is ideal for rough, technical trails, while faster rebound suits smoother trails.

Compression Adjustment

1. Locate the Compression Dial: The compression dial is typically found on the top of the right fork leg.
2. Adjust the Compression: Turning the dial clockwise increases compression damping (stiffer ride) while turning it counterclockwise decreases damping (softer ride). For aggressive riding or downhill conditions, a firmer compression setting may be beneficial, while cross-country riders may prefer a softer setting.

Routine Maintenance for Longevity

Regular maintenance is crucial for keeping your Bomber 58 fork performing at its best. By performing basic upkeep, you’ll avoid potential issues and prolong the lifespan of the suspension fork.

Cleaning the Fork

1. Wipe the Fork Legs: After each ride, wipe down the fork with a clean, damp cloth to remove dirt and debris. Pay special attention to the stanchions to ensure they remain free from contaminants.
2. Clean the Seals: Periodically clean the seals at the top of the fork legs. Use a seal cleaning tool or a soft rag to remove any dirt build-up around the seals. This prevents the seals from wearing out prematurely.

Lubing the Fork

1. Check the Oil Level: Over time, the oil in the Bomber 58’s fork can break down. Ensure the fork’s oil levels are adequate. Refer to the owner’s manual for the recommended oil type and quantity.
2. Replace the Fork Oil: Depending on the conditions you ride in, it’s advisable to change the fork oil every 50-100 hours of riding or once a season. This helps maintain smooth performance and minimizes wear on internal components.

Troubleshooting Common Issues

Despite its solid construction, the Bomber 58, like any component, can encounter a few issues during its lifespan. Understanding how to troubleshoot these problems can save time and money.

Common Issues:

• Fork Sinks or Bottoms Out: This could indicate insufficient air pressure or a lack of oil in the fork. Check the air pressure first and top off with the recommended amount. If the problem persists, change the fork oil and inspect for any internal damage.
• Excessive Stiction: If the fork feels sticky or unresponsive, the seals may be dirty or worn. Clean the seals and lubricate the stanchions. If the issue persists, consider replacing the seals.
• Noise During Compression: A creaking or popping noise may come from the fork’s internals, often due to low or dirty oil. Perform an oil change, and if the sound continues, check for loose bolts or worn parts.

Customization and Optimization

The Bomber 58 can be further optimized to your riding style through fine-tuning adjustments or aftermarket upgrades. Below are a few options to enhance the performance of your fork:

Adjusting the Air Spring Volume

Some riders prefer more progression or less initial stroke in their suspension. By adjusting the air spring volume spacers, you can change the feel of the fork’s travel. Adding more spacers will make the fork more progressive, while removing them gives it a more linear feel.

Upgrading the Dampers

For riders looking for better control and sensitivity, upgrading the damper to a high-end model, such as the Marzocchi HSCV damper, can offer more precise adjustments for both compression and rebound.

Compatibility with Other Drivetrain Components

The Bomber 58 suspension fork is compatible with most modern road and mountain bike drivetrains, including both 1x and 2x setups. It is also compatible with quick-release or through-axle systems, which can be customized according to your wheel type. Before purchasing, ensure the fork’s steerer tube length matches your frame’s head tube dimensions. Additionally, verify that your wheel’s axle type is compatible with the Bomber 58’s axle options.

By carefully maintaining your Bomber 58 and understanding how to adjust and optimize it, you can significantly improve your bike’s performance and enhance your overall riding experience.