Step-by-Step Guide: Rebuilding Your Epixon 34 Suspension Fork

Posted on
in Uncategorized

The SR Suntour Epixon 34 [paid link] is a high-performance, versatile [paid link] suspension fork ideal for road bikers looking for smooth ride quality and durability. Over time, like any suspension system, even the best forks can begin to show wear and tear. Rebuilding your Epixon 34 [paid link] suspension fork is essential for restoring its performance and extending its lifespan. This comprehensive guide walks you through the process of rebuilding your Epixon 34, ensuring your bike’s suspension functions like new.

Tools Required

Before you start, gather the following tools:

  • Fork-specific seal driver tool
  • 10mm socket wrench
  • Torque wrench [paid link]
  • 4mm, 5mm, and 6mm hex wrenches
  • T25 Torx driver
  • Plastic mallet
  • Oil drain pan
  • Suspension fork fluid (SR Suntour recommended)
  • Clean rags
  • Grease (preferably silicone-based)
  • Dust seals and wiper seals kit
  • New fork seals (if needed)
  • New foam rings (if needed)

Disassembling the Epixon 34 Suspension Fork

The first stage of rebuilding is to disassemble the fork, starting with removal from the bike and stripping it down to its internal components.

Step 1: Remove the Fork from the Bike

  1. Use a 5mm hex wrench to remove the headset bolts securing the fork to the head tube.
  2. Disconnect any cables or other components attached to the fork.
  3. Carefully remove the fork from the bike and place it on a clean, flat surface.

Step 2: Remove the Wheels and Dropouts

  1. If your fork uses a quick-release or thru-axle, remove the front wheel first.
  2. Next, remove the dropouts using the appropriate hex or Torx tool based on your fork model.

Step 3: Loosen the Compression and Rebound Dials

  1. Use the correct hex or Torx wrench [paid link] to unscrew both the compression and rebound dials, freeing the internals from resistance during disassembly.

Step 4: Remove the Top Cap and Spring

  1. Use a 10mm socket wrench to remove the top cap of the fork.
  2. Gently pull out the spring or air assembly housed within the top cap.

Step 5: Drain the Oil

  1. Place an oil drain pan underneath the fork.
  2. Unscrew the bolts securing the lower legs to the stanchions and carefully separate the two components.
  3. Allow the oil to drain completely and then clean the lower legs with a clean rag.

Inspecting and Replacing Fork Components

Once the fork is disassembled, carefully inspect the components for wear and damage.

Step 1: Inspect the Seals

  1. Examine the dust seals and wiper seals for cracks or wear.
  2. If damaged, remove the old seals using a seal driver tool and install new ones from the kit.

Step 2: Inspect the Stanchion Tubes

  1. Check the stanchion tubes for scratches, gouges, or any signs of wear.
  2. Minor scratches can be polished, but deep damage may require a stanchion replacement.
  3. Lubricate the stanchions with silicone-based grease before reassembly.

Step 3: Check the Foam Rings

  1. Inspect the foam rings, which lubricate internal fork parts.
  2. Replace any damaged or compressed foam rings with new ones.

Rebuilding the Epixon 34 Suspension Fork

Once you’ve inspected and replaced damaged components, it’s time to reassemble the fork.

Step 1: Reinstall the Seals

  1. Install new dust seals and wiper seals.
  2. Use the seal driver tool to seat the seals properly, ensuring they are aligned without twisting.

Step 2: Reassemble the Air Spring or Coil Spring

  1. If your fork uses an air spring, use an air pump to set the recommended air pressure.
  2. For a coil spring, ensure it’s seated properly in the fork’s top cap before tightening.

Step 3: Add Suspension Fluid

  1. Add the recommended amount of suspension fluid to the lower legs.
  2. Be sure to use the fluid recommended by SR Suntour for optimal performance.
  3. Distribute the fluid evenly and avoid overfilling, as excess fluid can cause performance issues.

Step 4: Reinstall the Lower Legs

  1. Align the lower legs with the stanchions and carefully slide them back together.
  2. Tighten the bolts securing the lower legs to the stanchions to the recommended torque specification.

Step 5: Reinstall the Top Cap

  1. Once the lowers are reattached, reinstall the top cap that houses the spring or air assembly.
  2. Secure the top cap with a 10mm socket wrench.

Adjusting the Epixon 34 Suspension Fork

Proper adjustment of your suspension fork ensures maximum performance. Here’s how to adjust your Epixon 34:

Step 1: Adjust the Air Spring Pressure

  1. For air springs, adjust the air pressure based on your body weight and riding style.
  2. Lower pressures offer a more plush ride, while higher pressures provide firmer support for aggressive riding.

Step 2: Set the Rebound and Compression Dials

  1. Adjust the rebound and compression dials to your preferred settings.
  2. A slower rebound is ideal for smoother terrain, while faster rebound settings work well for aggressive riding.
  3. Adjust the compression dial for the right level of resistance to prevent bottoming out.

Common Issues and Troubleshooting

While working on your Epixon 34, you may encounter common issues. Here are some troubleshooting tips:

Issue 1: Fork Not Holding Air

  • Check for leaks in the air valves or air spring seals. Replace damaged seals if necessary.

Issue 2: Uneven Suspension Travel

  • Ensure the air pressure and compression settings are correct. Uneven suspension could be a result of incorrect settings.

Issue 3: Noisy Fork

  • Noisy forks may indicate insufficient lubrication or worn seals. Re-lubricate the stanchions and replace worn seals.

Final Steps: Reinstalling the Fork on the Bike

Once the rebuild and adjustments are complete, it’s time to reinstall the fork on your bike.

Step 1: Reinstall the Fork

  1. Carefully reinstall the fork into the bike’s head tube.
  2. Tighten the headset bolts securely with a torque wrench [paid link].

Step 2: Reattach the Wheel and Dropouts

  1. Reinstall the front wheel, ensuring the dropouts are securely fastened.
  2. Tighten any quick release or thru-axle components to the proper torque.

Step 3: Test Ride

  1. Once everything is reassembled, take the bike for a test ride.
  2. Pay attention to the suspension’s performance and adjust as necessary for comfort and responsiveness.

By following these steps, you can successfully rebuild your SR Suntour Epixon 34 suspension fork, restoring its performance and ensuring it functions optimally on every ride. Regular maintenance and rebuilding will extend the life of your fork, allowing you to enjoy smoother and more comfortable rides for years to come.