A Beginner’s Guide to Tuning Bluto RL Suspension Forks

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The RockShox Bluto RL is a popular suspension fork designed for fat bikes, offering excellent performance in varied terrain conditions. Whether you’re riding over snow, sand, or rough trails, this fork provides superior cushioning and control. However, to truly optimize your ride, understanding how to properly tune your Bluto RL suspension fork is essential. This guide will walk you through the installation, adjustment, maintenance, and troubleshooting steps to ensure your suspension fork operates at its best.

Tools Required

  • 8mm Allen wrench [paid link]
  • 5mm Allen wrench [paid link]
  • RockShox Suspension Oil
  • A pump with a RockShox compatible valve
  • Torque wrench [paid link]
  • Clean cloths
  • Grease (for assembly)
  • Suspension fluid (for maintenance)
  • Bushing press (for servicing the fork)

Installation of Bluto RL Suspension Fork

Installing the Bluto RL suspension fork involves several steps. This section will cover the proper installation process to ensure your fork functions correctly and securely on your bike.

  1. Prepare the Fork: Start by ensuring that the fork is free of any packaging materials. Check that the fork has been properly prepped with lubrication where necessary, including on the steerer tube and dropouts.
  2. Remove the Old Fork: If you’re replacing an existing fork, first remove the front wheel. Then, use the appropriate Allen wrenches [paid link] to detach the current fork from the headset and the bike’s frame.
  3. Install the Steerer Tube: Slide the steerer tube of the Bluto RL into the head tube of your bike frame. Be sure that the tube is cut to the correct length. If the steerer tube is too long, it may need to be trimmed using a pipe cutter.
  4. Attach the Fork to the Frame: Insert the fork into the head tube and secure it using the headset compression system. Tighten the top cap, but be careful not to overtighten it, as this can cause damage to the bearings in the headset.
  5. Mount the Wheel: After securing the fork, install the front wheel into the fork dropouts. Ensure the wheel is properly aligned and tightly secured with the quick-release or through-axle system, depending on the model.
  6. Test the Alignment: Before tightening everything completely, check the alignment of the fork and wheel. Adjust as necessary and ensure that everything is straight and secure.
  7. Final Checks: After installing the fork, double-check the torque settings on the headset and wheel to make sure everything is properly secured.

Adjustment of Bluto RL Suspension Fork

Tuning your Bluto RL fork can dramatically improve your ride, giving you better control and comfort. Proper adjustment involves setting up the fork’s pressure and damping systems to suit your riding style.

Setting the Air Pressure

  1. Determine the Correct Pressure: Air pressure is crucial for the performance of your Bluto RL fork. Start by consulting the recommended air pressure range from RockShox, which is usually based on rider weight.
  2. Adjust for Rider Weight: If you’re heavier or lighter than the average rider for your fork’s recommended air pressure, adjust accordingly. Use the pump to add or release air from the fork’s air spring. Make sure to pressurize the fork at a level that allows you to get about 25-30% of travel when you sit on the bike.
  3. Test the Sag: To test the air pressure setting, compress the fork and check how much travel is used. If the fork bottoms out too quickly, decrease the air pressure. Conversely, if it feels too stiff and doesn’t compress properly, you may need to add more pressure.

Adjusting the Rebound

  1. Locate the Rebound Adjuster: The Bluto RL features an external rebound adjuster. This dial is typically found on the bottom of the right fork leg.
  2. Set the Rebound Speed: Turn the rebound adjuster to control how quickly the fork returns to its original position after compression. For smoother trails, a faster rebound setting may work well, while slower rebound works better on rougher terrain where you need more control.

Compression Damping Adjustment

  1. Find the Compression Dial: The compression adjustment on the Bluto RL can be set with the dial located on the top of the right fork leg. This controls the amount of compression the fork allows under force.
  2. Adjust the Compression: For smoother rides, turn the dial to a softer compression setting, allowing the fork to absorb smaller bumps. On rougher trails, you may want to increase compression to prevent bottoming out.

Maintenance of Bluto RL Suspension Fork

Regular maintenance of your Bluto RL fork will ensure it performs well over the long term. This includes cleaning, oil changes, and checking for wear and tear on components.

Cleaning the Fork

  1. Wash After Each Ride: After every ride, wipe down the fork with a clean cloth to remove any dirt, mud, or debris that may have accumulated.
  2. Lubricate the Seals: Apply a small amount of suspension fluid to the stanchions and wipe away excess to prevent dirt from collecting. This helps maintain the fork’s smooth operation.

Changing the Oil

  1. Remove the Fork from the Bike: Disconnect the fork from the bike, making sure to release air pressure before servicing.
  2. Disassemble the Fork: Carefully remove the lowers and open the fork to access the damper and air spring chambers. Be sure to note the arrangement of parts for reassembly.
  3. Drain and Replace the Oil: Drain any old suspension oil and replace it with the appropriate RockShox fluid, as specified for the Bluto RL. Be sure to use the correct weight of oil to match the fork’s specifications.
  4. Reassemble the Fork: Carefully reassemble the fork, ensuring that all seals and components are properly lubricated and that the parts are correctly aligned.
  5. Test the Fork: After reassembling, pump the fork to the desired pressure, test its travel, and check that the rebound and compression adjustments are functioning properly.

Inspecting for Wear and Tear

  1. Check for Leaks: Regularly inspect the seals around the fork’s legs and the damper area for signs of leakage. If you notice oil leaking, it may be time to replace the seals.
  2. Inspect the Stanchions and Bushings: Check for any scratches or damage to the stanchions. Also, inspect the fork bushings to ensure they are not worn or damaged.

Troubleshooting Common Set-Up Issues

Fork Bottoming Out

If your fork bottoms out too easily, it could be a sign of too little air pressure or inadequate compression damping. Check the air pressure and ensure that the compression damping is set correctly for the terrain.

Fork Feels Too Stiff

If the fork feels too stiff, even on smooth trails, try decreasing the air pressure to give the fork more sag and allow it to absorb small bumps more efficiently. Additionally, adjust the rebound speed to ensure smooth travel.

Uneven Travel

Uneven travel or side-to-side play in the fork can be a result of improperly tightened bolts or worn-out bushings. Ensure all bolts are tightened correctly, and inspect the bushings for wear and replace if necessary.

Customization and Optimization for Better Performance

Optimizing the performance of your Bluto RL fork can help tailor your ride to your specific needs.

Changing the Air Spring Volume

  1. Adjust Volume Spacers: The Bluto RL allows for adjustments in the air spring’s volume through the use of volume spacers. Adding spacers reduces the fork’s mid-stroke and bottom-out volume, giving you more support in the latter half of the fork’s travel.
  2. Adjust for Terrain: Consider adding or removing spacers depending on whether you ride on smoother or rougher trails.

Fine-Tuning Compression and Rebound

  1. Set Compression for Terrain Type: Adjust the compression setting based on the terrain. On technical trails with a lot of drops, a higher compression will prevent the fork from diving too deeply, while a lower setting helps on smoother trails where you want more sensitivity.
  2. Rebound for Control: Fine-tune the rebound to match your riding style. A slower rebound setting is ideal for aggressive riders on rough terrain, while a faster setting works better for lighter riders or smoother trails.

Comparison with Similar Models

When comparing the Bluto RL to other suspension forks in its class, such as the RockShox Pike or Fox 34, the Bluto RL stands out for its specialized design for fat bikes. It offers a higher level of control on soft terrain like snow or sand, where the added travel and volume provide optimal performance. While the Pike and Fox forks may offer more adjustment range, the Bluto RL is better optimized for fat bike riders who need precise handling on uneven surfaces.

Compatibility with Other Drivetrain Components

The Bluto RL fork is designed to work with most modern fat bikes and can be paired with a wide range of drivetrains. However, it’s important to check the axle type (quick release or through-axle) and fork length to ensure compatibility with your bike’s frame. Additionally, the fork’s damping system is tuned for fat bike-specific needs, so while it can work with other bike types, it is particularly optimized for fat bike geometry.