The Öhlins RXF38 m.2 [paid link] is a high-performance suspension fork designed for serious cyclists seeking optimal control, comfort, and durability. Proper maintenance of your RXF38 m.2 [paid link] ensures that the fork delivers peak [paid link] performance throughout its lifespan. In this guide, we’ll walk you through the installation, adjustment, and maintenance of the RXF38 m.2, troubleshooting common set-up issues, and offer tips for customization and optimization. Additionally, we’ll discuss compatibility with other drivetrain components to help you get the most out of your fork.
Tools Required
- 5mm and 6mm Allen wrenches [paid link]
- Torque wrench [paid link] (range of 5–40 Nm)
- Suspension fluid (Öhlins-approved)
- Suspension fork oil (specific to the RXF38 m.2)
- Clean, lint-free cloth
- Bushing press tool
- Fork seals
- Suspension grease
- Bucket or drain pan for oil drainage
- Bicycle stand (optional but recommended for stability)
Installation of the RXF38 m.2
The installation process of the RXF38 m.2 requires careful attention to detail to ensure proper performance and avoid damage to the fork or bike frame. Follow these steps for a smooth installation:
- Remove the old fork: Begin by removing your current fork. Use a 5mm or 6mm Allen wrench [paid link] to disconnect the fork from the headset and any other components. Once detached, remove the fork carefully.
- Prepare the RXF38 m.2: Before installing the new fork, check if the steerer tube length needs trimming to fit your bike frame. If needed, measure and cut the steerer tube using a pipe cutter for a clean, precise cut. After trimming, deburr the cut edge.
- Install the headset: Place the headset bearings onto the bike frame. Ensure the lower bearing sits snugly in the frame’s head tube. For the upper bearing, install it into the crown race or top headset assembly.
- Insert the fork: Slide the RXF38 m.2 into the head tube, ensuring it aligns properly with the headset bearings. Make sure the fork’s steerer tube goes fully into the headset assembly.
- Torque the headset: Using a torque wrench [paid link], tighten the headset compression bolt and stem bolts to the manufacturer’s recommended torque setting (typically 5–8 Nm for the compression bolt and 6–10 Nm for the stem bolts).
- Adjust the fork travel: Ensure the RXF38 m.2’s travel setting is compatible with your bike’s intended use (e.g., enduro, cross-country). The RXF38 m.2 has adjustable travel, so adjust accordingly for optimal performance.
- Check brake caliper alignment: If your bike uses a disc brake, check the brake caliper alignment. Ensure that the brake rotor is centered and does not rub against the caliper.
Adjustment and Fine-Tuning
To optimize the performance of your RXF38 m.2, fine-tuning the suspension settings is essential. Below are key adjustments to make:
Rebound and Compression Damping
- Rebound adjustment: Rebound controls how quickly the suspension returns to its normal position after compressing. Adjust the rebound knob located on the bottom of the fork. Turn the knob clockwise for slower rebound or counterclockwise for faster rebound.
- Compression damping: Compression damping adjusts how much the fork resists compression when you hit bumps or obstacles. The RXF38 m.2 features both high and low-speed compression adjustments. Start by setting the low-speed compression to a middle range and adjust the high-speed compression based on the terrain you’ll be riding.
Air Spring Pressure
The RXF38 m.2 uses an air spring system, which requires correct air pressure to achieve the right amount of sag. The proper air pressure will vary depending on your weight and riding style:
- Determine the correct air pressure: Use a shock pump to add air to the fork’s air spring chamber. Start by using the manufacturer’s recommended pressure chart based on your body weight. Fine-tune the pressure until you achieve around 15–20% sag, which is a good starting point for most riders.
- Check for proper sag: Once you have the air pressure set, check the sag by sitting on the bike. If the fork compresses too much or too little, adjust the air pressure accordingly.
Maintenance of the RXF38 m.2
Routine maintenance is crucial for ensuring your RXF38 m.2 continues to perform at its best. Follow these maintenance tips to extend the lifespan of your fork.
Cleaning the Fork
- Wipe down the fork: After each ride, use a clean, lint-free cloth to wipe down the stanchions and fork legs. Remove any dirt, mud, or debris that could affect the seals or the performance of the fork.
- Inspect seals: Regularly check the fork seals for any signs of wear, dirt, or damage. Clean the seals using a special seal cleaning tool or a soft cloth. If the seals are damaged or worn out, replace them to prevent leakage of fork oil.
Oil Changes
Changing the suspension fluid in the RXF38 m.2 ensures smooth performance and longevity. Here’s how to perform an oil change:
- Disassemble the fork: Use your 5mm and 6mm Allen wrenches [paid link] to remove the fork legs from the crown and the lower leg. Carefully disassemble the fork, keeping track of any small parts like bushings and spacers.
- Drain old oil: Position the fork over a drain pan and remove the drain bolts. Let the old suspension fluid drain completely from the fork.
- Clean internal parts: After draining the old oil, clean all internal components using a clean cloth. Pay special attention to the bushings and seals.
- Add fresh oil: Add the correct type of suspension oil (Öhlins-approved) to the fork legs, ensuring the correct amount specified by the manufacturer. Reassemble the fork after oil is added.
Lubricating Moving Parts
Lubricating the moving parts inside the fork helps reduce friction and improve performance. Use a suspension grease to lubricate the bushings, stanchions, and other moving components. Apply grease sparingly to avoid contamination of the oil or seals.
Troubleshooting Common Issues
Although the RXF38 m.2 is a high-quality fork, you may encounter some issues during use. Here are common problems and how to address them:
Fork Not Returning Properly
If your fork isn’t returning to its full extension after compression, it could be a sign of improper rebound adjustment, low air pressure, or contaminated seals. Check the rebound settings and air pressure first, then inspect the seals for any dirt or damage.
Spongy or Soft Feel
A soft, spongy feel may indicate that the air pressure is too low or that the compression damping settings need adjustment. Check the air pressure and adjust the compression settings accordingly.
Leaking Oil
If you notice oil leaking from the fork, the seals may be worn out or damaged. Inspect the seals for signs of wear, and if necessary, replace them. Also, check the fork for any cracks or damage to the stanchions.
Customization and Optimization
To fine-tune the performance of the RXF38 m.2 for your riding style, consider adjusting the settings based on your preferences and riding conditions:
- Adjust travel: The RXF38 m.2 allows you to modify its travel, making it ideal for different riding disciplines. For aggressive downhill riding, increase travel to enhance the fork’s ability to absorb large impacts. For cross-country or all-mountain riding, reduce the travel to optimize climbing efficiency.
- Rebound and compression settings: Play around with the high and low-speed compression and rebound damping to find a setting that provides the best balance between comfort and control.
- Fork stiffness: If you’re looking for a more responsive feel, adjust the air spring pressure to increase the fork stiffness. This is especially useful for riders who prefer a firmer ride for better control on technical trails.
Compatibility with Other Drivetrain Components
The RXF38 m.2 is compatible with most modern mountain bike drivetrains, including those using 15mm, 20mm, and 110mm boost hubs. Ensure your wheelset matches the fork’s axle requirements for a secure fit. Additionally, if you’re upgrading other components like your rear shock or wheels, ensure they are compatible with the RXF38 m.2 to maintain optimal performance across your entire suspension system.