DIY Guide: Suspension Fork Inspection for Aion 35

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The SR Suntour Aion 35 [paid link] suspension fork is designed to provide superior performance and comfort for riders who demand both reliability and precision. Regular inspection and maintenance of your suspension fork ensure smooth handling and safety. This guide covers everything you need to know about inspecting and maintaining your Aion 35 [paid link] fork to keep it in top condition.

Tools Required

Suspension Fork Overview

The Aion 35 from SR Suntour is equipped with a 35mm stanchion, which offers a sturdy and reliable fork for various riding conditions. The fork is designed to handle the demands of aggressive riding, providing both comfort and stability. It features an air spring and a hydraulic damping system for efficient performance on rough terrains.

Step 1: Initial Inspection

Before diving into the disassembly process, it’s important to perform an initial visual inspection of the fork. Here’s what you should look for:

  • Stanchion Condition: Check for scratches, dents, or excessive wear on the stanchions. Minor marks are normal, but deep gouges could compromise the fork’s performance.
  • Fork Alignment: Ensure that the fork is aligned correctly with the bike frame. A misaligned fork can cause handling issues.
  • Suspension Travel: Test the fork’s travel by pushing down on the handlebars. The fork should compress and rebound smoothly without any jerky motion or stiffness.
  • Air Pressure: Inspect the air pressure by checking the air valve. Low air pressure can lead to poor suspension performance. Reinflate if necessary.

Step 2: Disassembly for Thorough Inspection

To perform a detailed inspection, the fork needs to be partially disassembled. Here’s a step-by-step guide to do it:

  1. Remove the Front Wheel: Place your bike in a stable stand and remove the front wheel to access the fork.
  2. Loosen the Brake Caliper: If your Aion 35 is equipped with a disc brake, use the appropriate Allen wrench to loosen and remove the brake caliper from the fork. Take care not to damage the brake lines if you leave them attached.
  3. Remove the Fork from the Headset: Use a 6mm Allen wrench to loosen the fork’s axle and remove the fork from the headset. Make sure to keep the headset bearings and parts organized for reassembly.
  4. Disassemble the Fork: Using a 5mm Allen wrench, remove the air valve and fork cap. Carefully extract the air spring assembly. If necessary, remove the lowers for further inspection and maintenance.

Step 3: Cleaning and Lubricating the Fork

Once the fork is disassembled, it’s time to clean and lubricate the components. Proper cleaning ensures smooth functioning and prevents dirt build-up that can cause damage over time.

  • Clean the Stanchions: Use a cleaning brush and rag to wipe down the stanchions, removing any dirt or debris. Be gentle to avoid damaging the coating on the stanchions.
  • Lubricate the Seals: Apply a thin layer of fork grease to the seals to keep them in good condition. Make sure not to over-lubricate, as excess grease can attract dirt.
  • Inspect the Bushings: Check the bushings on the lowers for any signs of wear. Worn bushings can cause the fork to feel sluggish or make unwanted noise.

Step 4: Refill the Suspension Oil

If your inspection reveals that the suspension oil is low or dirty, it’s important to replace it. Follow these steps to refill the oil:

  1. Drain Old Oil: Using the syringe, drain any remaining suspension oil from the lowers.
  2. Add New Oil: Refill the lowers with the recommended oil type for the Aion 35. Refer to the user manual for the exact oil specifications and volume.
  3. Check Oil Level: Ensure that the oil level is correct by checking the recommended level based on the fork’s travel. Excessive oil can cause over-compression, while too little oil can result in insufficient damping.

Step 5: Reassemble the Fork

After cleaning and oiling, it’s time to reassemble the fork. Follow these steps carefully to ensure everything is put back together correctly:

  1. Reinstall the Air Spring: Insert the air spring into the fork, making sure it’s seated correctly.
  2. Secure the Fork Cap: Tighten the fork cap with the appropriate torque settings as recommended in the manual.
  3. Reassemble the Lowers: Carefully reinstall the lowers and tighten the bolts to the correct torque specification. Double-check all bolts for proper tightness.
  4. Reinstall the Fork on the Bike: Place the fork back into the headset, tightening the axle and headset bolts to secure it in place.
  5. Reattach the Brake Caliper: Reattach the brake caliper to the fork, ensuring that it is aligned correctly with the rotor. Tighten the bolts properly to avoid any brake alignment issues.

Step 6: Air Pressure Adjustment

Now that the fork is reassembled, it’s essential to check and adjust the air pressure. Proper air pressure is crucial for maintaining the correct suspension feel and performance.

  1. Check Manufacturer Recommendations: Refer to the Aion 35 manual for the recommended air pressure based on your weight and riding style.
  2. Use an Accurate Pump: Use a high-quality shock pump to inflate the fork to the recommended air pressure. Make sure not to exceed the maximum pressure rating to avoid damaging the fork.
  3. Test the Fork: After adjusting the air pressure, test the fork by pushing down on the handlebars. The fork should compress smoothly without bottoming out or being too stiff.

Step 7: Common Set-Up Issues and Troubleshooting

Even with regular maintenance, certain issues may arise during use. Here are some common issues and how to troubleshoot them:

  • Fork Feeling Stiff: If the fork feels too stiff, it could be due to too much air pressure. Reduce the air pressure slightly and test again. If the issue persists, check the fork oil level or the condition of the seals.
  • Fork Bottoming Out: If the fork bottoms out during use, it could indicate that the air pressure is too low or the oil is insufficient. Recheck the air pressure and oil levels, and add more oil if necessary.
  • Noise or Creaking: Noise from the fork could be caused by dry or worn seals. Lubricating the seals or replacing them may resolve the issue. If the noise continues, inspect the bushings for wear.

Step 8: Regular Maintenance Schedule

To keep your SR Suntour Aion 35 fork performing optimally, establish a regular maintenance schedule:

  • Every 50-100 hours of riding: Clean and lubricate the stanchions, check the air pressure, and inspect the seals.
  • Every 100-150 hours of riding: Replace the suspension oil and inspect the bushings and air spring.
  • Annually: Perform a full inspection and overhaul of the fork, replacing any worn parts and ensuring everything is properly lubricated and adjusted.

Conclusion

The SR Suntour Aion 35 is a high-performance suspension fork that offers smooth handling and comfort. By following this guide and performing regular inspections and maintenance, you can ensure that your fork remains in excellent condition, providing you with the best riding experience possible. Proper care and attention to detail will help you extend the lifespan of your suspension fork while maximizing performance on the trails.