Rebuilding your RockShox Lyrik Ultimate MY25 suspension fork ensures optimal performance, enhances longevity, and provides a smooth ride, whether you’re racing down trails or taking on rugged mountain paths. This guide will walk you through every step required to disassemble, inspect, clean, replace parts, and reassemble the Lyrik Ultimate MY25 fork. It’s designed to help you keep your suspension fork working at its best while understanding the necessary procedures for each task.
Tools Required
- 5mm, 6mm, and 8mm Allen wrenches [paid link]
- RockShox seal driver tool (for removing and installing seals)
- Fork-specific suspension fluid (e.g., RockShox 0W-30 or equivalent)
- Synthetic grease
- Oil bath (for cleaning parts)
- Torque wrench [paid link] (set to manufacturer’s recommended torque specs)
- T25 and T30 Torx wrenches
- Bleed kit [paid link] (if necessary)
- Isopropyl alcohol (for cleaning)
Disassembly of the Lyrik Ultimate MY25 Fork
Step 1: Prepare Your Workspace
Ensure that your workspace is clean, organized, and well-lit. Lay out a clean cloth to place your fork components on as you disassemble it. This will prevent parts from getting scratched or lost.
Step 2: Remove the Fork from the Bike
To begin, remove the fork from the bike frame. Use a 5mm Allen wrench [paid link] to loosen and remove the axle from the front wheel. Then, use an 8mm Allen wrench [paid link] to detach the fork from the headset. Set the fork aside.
Step 3: Remove the Front Wheel and Disassemble the Brake Caliper
To fully remove the fork, detach the brake caliper from the fork legs. Use a 5mm Allen wrench to remove the bolts securing the caliper to the fork. If your bike has a through-axle system, make sure to remove that as well.
Step 4: Detach the Air Shaft Assembly
Once the fork is off the bike, begin disassembling the air spring assembly. First, loosen the top cap of the fork with a T30 Torx wrench [paid link]. Then, remove the air spring unit by pulling it out of the lower legs. Be cautious of the internal pressure, which may cause some force when detaching.
Step 5: Drain the Oil
Next, place the fork over an oil catch pan to drain the old suspension oil. Use a 6mm Allen wrench to remove the rebound and compression knobs on the damper side, allowing the oil to fully drain from the damper chamber. Repeat for the other side if necessary.
Inspection and Cleaning
Step 6: Inspect for Wear and Damage
With the fork disassembled, check all internal components for wear and tear. Look for signs of damage on the seals, bushings, air spring, and damper. Pay close attention to the oil bath and stanchions to ensure there are no deep scratches, which could lead to poor performance or leaks.
Step 7: Clean All Parts Thoroughly
Use isopropyl alcohol to clean all parts. Wipe the stanchions, seals, and other components to remove old dirt and oil residue. You can use a soft cloth or brush to avoid damaging the parts. Ensure that all internal surfaces are free from debris and contaminants.
Rebuilding the Lyrik Ultimate MY25 Fork
Step 8: Reinstall the Air Spring Assembly
Once all components are cleaned and inspected, it’s time to rebuild the air spring. Apply a small amount of suspension grease to the air spring shaft and seals. Reinstall the air spring into the fork legs, making sure it fits securely. Tighten the top cap back on using a torque wrench [paid link] to the manufacturer’s recommended torque setting.
Step 9: Reassemble the Damper Side
Now, reassemble the damper side by replacing the damper unit back into the fork lowers. Add new suspension oil to the damper chamber according to RockShox specifications. Make sure the damper is positioned correctly and that all seals are in place to prevent leakage. Reattach the rebound and compression knobs, ensuring they are torqued correctly.
Step 10: Install New Seals
Install the new seals using a RockShox seal driver tool to ensure proper installation. These seals help maintain the integrity of the fork and prevent dirt and water from entering the internal components. Be sure to check the dust wipers and oil seals to ensure they are in optimal condition.
Step 11: Add Fresh Suspension Fluid
Once the fork is reassembled, it’s important to add fresh suspension fluid to both the air spring and damper side. Follow the RockShox specifications regarding fluid volume and type, as this ensures optimal performance. For the Lyrik Ultimate MY25, use the recommended 0W-30 suspension fluid for the air spring and the specific fluid for the damper.
Step 12: Bleed the Fork (If Necessary)
If your Lyrik Ultimate MY25 has a hydraulic damper, a bleed may be required to ensure smooth movement. Use a proper bleed kit [paid link] and follow the manufacturer’s instructions to remove any air bubbles in the system.
Reassembly and Final Adjustments
Step 13: Reinstall the Fork on the Bike
Once everything is rebuilt and lubricated, it’s time to reinstall the fork onto the bike. Attach the fork to the headset and tighten the bolts with a 6mm Allen wrench to the recommended torque specification. Reinstall the front wheel and brake caliper, ensuring everything is secure.
Step 14: Test the Fork
Before going for a ride, test the fork by compressing it manually. Check for smooth movement without any signs of binding or roughness. Adjust the rebound and compression settings based on your preferences, ensuring they align with your riding style and terrain.
Troubleshooting Common Set-Up Issues
Issue 1: Unresponsive Fork
If your fork feels unresponsive or lacks rebound, check the air pressure and adjust it to the recommended setting. Also, inspect the damper for any oil leakage or contamination that could affect performance.
Issue 2: Leaky Seals
If you notice oil leaks or excessive stiction, inspect the seals for wear or damage. Replace them if necessary, ensuring that the installation is done properly using a seal driver tool.
Issue 3: Noisy Fork
If your fork is making unusual noises, such as clicking or creaking, check the internal bushings and stanchions. Clean and lubricate them if necessary, and ensure that all bolts are torqued correctly.
Customization and Optimization for Better Performance
Adjusting Rebound and Compression
Fine-tuning the rebound and compression settings will improve the responsiveness and control of your Lyrik Ultimate MY25 fork. Start by adjusting the compression to suit your riding style. For smoother terrain, a lighter compression setting is ideal, whereas a firmer setting will help with more technical trails. Similarly, adjust the rebound for faster or slower return speed, based on the conditions you encounter.
Upgrading Air Spring Volume Spacers
For added control and to tailor your fork’s performance to your preferences, consider adjusting or adding air spring volume spacers. These spacers help manage bottom-out resistance, which can improve your ride quality during aggressive riding.
Comparison with Similar Models
While the RockShox Lyrik Ultimate MY25 fork is known for its superior performance, other forks like the RockShox Pike or the Fox 36 may offer similar features with some distinct differences. The Lyrik Ultimate MY25 stands out with its precise damper adjustments and superior air spring system, making it suitable for enduro and aggressive trail riding. In contrast, the Fox 36 offers a slightly stiffer and more responsive feel, but the Lyrik fork tends to provide a smoother, more controlled ride on technical descents.
Understanding Compatibility with Other Drivetrain Components
The Lyrik Ultimate MY25 fork is compatible with a wide range of drivetrain systems, including SRAM and Shimano groupsets. When setting up your bike, ensure that the fork is installed with compatible axles and headset parts for optimal performance. The fork’s through-axle system works well with most modern drivetrains, offering maximum stiffness and stability for aggressive riding.