The Aion 35 [paid link] suspension fork by SR Suntour is a reliable choice for cyclists seeking smooth performance on a variety of terrains. To maintain its optimal function, proper installation, adjustment, and regular maintenance are essential. In this guide, we’ll walk you through all the necessary steps to ensure your Aion 35 [paid link] suspension fork stays in top shape, troubleshoot common issues, and make the most out of your ride.

Tools Required

• 5mm Allen wrench [paid link]
• 6mm Allen wrench [paid link]
• Flathead screwdriver
• Torque wrench [paid link]
• Suspension oil (SR Suntour recommended type)
• Cleaning rag
• Grease (bike-specific)
• Cable tie (optional)

Installation of the Aion 35 Suspension Fork

Installing the Aion 35 suspension fork is straightforward but requires careful attention to detail. Follow these steps for a successful installation:

1. Remove the old fork: Begin by removing your old fork from the bike. Use the 5mm Allen wrench to detach the fork from the headset and the 6mm wrench for any other necessary bolts (e.g., for the brake caliper or axle).
2. Prepare the new fork: If your Aion 35 fork requires any adjustments before installation, such as adding air or setting the sag, do this now. Follow the manufacturer’s specifications for fork setup.
3. Install the fork: Slide the Aion 35 fork into the headset and secure it using the appropriate headset compression bolts. Ensure that the fork is properly aligned with the head tube.
4. Install the brake caliper and axle: Attach the brake caliper, making sure it is centered and aligned. For the axle, follow the manufacturer’s instructions to avoid any misalignment that could affect handling.
5. Check torque settings: Using a torque wrench [paid link], tighten all bolts to the recommended torque values. Over-tightening can damage components, while under-tightening may lead to unsafe riding conditions.
6. Final adjustments: Once the fork is in place, check the fork’s alignment, brake rotor alignment, and smooth movement before riding.

Adjustment for Optimal Performance

Adjusting your Aion 35 fork ensures you get the most out of your riding experience. Proper suspension setup depends on your weight, riding style, and terrain. Here’s how to fine-tune your fork:

1. Setting the Air Pressure: The Aion 35 features an air spring, so adjusting the air pressure is crucial. Start by setting the recommended air pressure based on your rider weight. You can fine-tune it based on your preferences. A good starting point is to achieve 25-30% of the fork’s travel as sag.
2. Adjusting the Rebound: The rebound dial on the bottom of the fork leg controls how quickly the fork returns after compressing. Adjust this to match the terrain. For faster terrains, increase rebound to avoid the fork from bouncing back too quickly. For technical or slower trails, decrease rebound for better control.
3. Compression Adjustment: The Aion 35 fork offers a compression dial to control how much the fork resists compression. If you’re riding on smoother trails, you can set it firmer for better efficiency. For rougher terrain, soften it to allow the fork to absorb impacts more effectively.
4. Fine-tuning: After setting the air pressure and adjustments, take a short ride to test the performance. Make small adjustments until the fork feels responsive without bottoming out too often or bouncing excessively.

Routine Maintenance for Longevity

Regular maintenance of your Aion 35 suspension fork ensures long-lasting performance. Follow these steps to keep your fork in prime condition:

1. Cleaning the Fork: After each ride, clean the fork with a soft rag to remove dirt, mud, and debris. Be sure not to use harsh chemicals or solvents that could damage the seals or the fork’s finish.
2. Lubing the Stanchions: Periodically apply a small amount of bike-specific lubricant to the stanchions to ensure smooth fork action and to prevent wear on the seals.
3. Inspecting the Seals: Inspect the fork’s seals regularly for signs of damage or wear. If the seals are cracked or leaking oil, it’s time to replace them. Seals play a crucial role in maintaining the fork’s performance and longevity.
4. Suspension Oil Change: It’s recommended to change the suspension oil in the Aion 35 fork every 100 hours of riding or annually, whichever comes first. Drain the oil, clean the internal components, and replace it with fresh oil. This will maintain the damping quality and prevent internal damage.
5. Check for Leaks: Over time, the fork’s oil seals might develop leaks. If you notice oil around the seals or the stanchions, inspect the fork carefully. Leaks can significantly affect performance, and it’s important to address them promptly by replacing the seals or servicing the fork.

Troubleshooting Common Set-Up Issues

Here are some common issues riders face with the Aion 35 fork and how to troubleshoot them:

1. Fork Not Compressing Properly: If the fork feels stiff and doesn’t compress correctly, check the air pressure. If the pressure is too high, the fork won’t compress fully. Also, verify the rebound and compression settings are correctly adjusted for the terrain.
2. Fork Bottoming Out: If the fork bottoms out too easily, you may need to increase the air pressure or adjust the compression settings to make the fork stiffer. Also, check if the travel is appropriately set for your weight and riding style.
3. Uneven Travel: Uneven travel may indicate improper installation or incorrect air pressure. Double-check the fork’s alignment and ensure the air spring is properly set.
4. Unusual Noises: If you hear popping or clicking noises from the fork, it could be due to dirt or debris in the fork’s internals. Clean and lubricate the stanchions, and inspect the seals for wear.
5. Leakage of Suspension Oil: Leaking oil around the fork’s seals could mean that they are damaged or worn. Replace the seals and change the suspension oil to restore performance.

Customizing Your Aion 35 Fork for Better Performance

Customizing the Aion 35 suspension fork can help you achieve the perfect setup for your riding style. Here are a few tips for optimizing the fork:

1. Adjust Air Pressure Based on Riding Style: If you prefer more comfort, you can run lower air pressure for a softer ride. If you’re into aggressive downhill or enduro riding, higher pressure provides better support and prevents bottoming out.
2. Upgrade the Spring: SR Suntour offers various spring options that can further optimize the fork for your weight and riding style. Upgrading to a stiffer or softer spring can dramatically change the feel of the fork.
3. Adding Volume Spacers: Volume spacers are used to modify the fork’s progression. Adding spacers can help prevent bottoming out on big hits and improve control on rough terrain.
4. Custom Damping Set-Up: Some riders opt to fine-tune the compression and rebound damping by experimenting with different settings or upgrading the internal damping components for a more tailored riding experience.

Comparing the Aion 35 with Similar Models

When choosing a suspension fork, comparing the Aion 35 to other models can help riders make an informed decision. Compared to other forks in the same price range, the Aion 35 is a solid choice for riders looking for durability and smooth performance on both cross-country and light trail rides. While forks like the RockShox Reba or Fox 32 may offer slightly better weight savings and advanced damping features, the Aion 35 provides excellent value, especially for riders looking for a fork that delivers solid performance without breaking the bank.

Compatibility with Other Drivetrain Components

The Aion 35 suspension fork is compatible with most standard 9, 10, and 11-speed drivetrains. When installing, ensure the fork’s axle and brake mount system align with your frame and components. The Aion 35 supports both QR (quick release) and thru-axle systems, which are commonly found in modern road and trail bikes. Always verify the axle type and size before purchasing.

Maintaining and optimizing your Aion 35 suspension fork will ensure a smooth, comfortable ride for many miles. Proper care, attention to detail, and fine-tuning for your specific needs will allow you to get the best performance out of your fork.