1. Introduction
This manual provides detailed instructions for the installation, setup, operation, and maintenance of your DNM AO-38RC Air Rear Shock. Designed for mountain bikes and folding bikes, this pneumatic shock absorber offers adjustable damping, compression, and air pressure, along with a locking mechanism for versatile performance across various terrains. Please read this manual thoroughly before installation and use to ensure optimal performance and safety.
2. Safety Information
Always prioritize safety when working with bicycle components. Improper installation or adjustment can lead to serious injury or damage to your bicycle. If you are unsure about any step, consult a professional bicycle mechanic.
- Ensure all bolts are tightened to the manufacturer's recommended torque specifications.
- Do not exceed the maximum air pressure of 270 PSI.
- Regularly inspect the shock absorber for any signs of wear, damage, or leaks.
- Wear appropriate safety gear during installation and riding.
3. Product Components and Overview
The DNM AO-38RC Air Rear Shock is available in both wire-controlled and manual control versions, and various lengths. Each shock absorber is equipped with two 24mm bushings by default. Other bushing lengths are available if needed.
Key Features:
- Adjustable Damping: Fine-tune rebound speed.
- Compression Adjustment: Control shock compression.
- Air Pressure Adjustment: Customize firmness (max 270 PSI).
- Shock Absorber Locking: Lockout feature for climbing or smooth terrain.
Available Lengths:
- 165mm
- 190mm
- 200mm
- 210mm
Bushings:
The shock absorber comes with 24mm bushings. Other sizes are available:
4. Installation Guide
Before installing, ensure your bicycle frame is compatible with the chosen shock absorber length. Frame manufacturers typically specify the required shock length and width.
General Installation Steps:
- Measure Frame: Use a measuring tool to confirm the required length and width for the shock absorber on your frame.
- Install Bushings: Insert the appropriate bushings into the shock absorber's eyelets.
- Mount Shock Absorber: Carefully align the shock absorber with the mounting points on your bicycle frame. Insert the mounting bolts and tighten them securely according to your frame manufacturer's torque specifications.
Wire-Controlled Shock Absorber Installation:
For wire-controlled versions (AO-38RL), follow these additional steps to install the remote control cable:
- Pass Steel Cable: Guide the steel cable through the center hole of the remote lockout mechanism on the shock absorber.
- Extend Cable: Ensure the cable extends about 15mm through the hole.
- Tighten with Hex Wrench: Use a 1.5mm hex wrench to tighten the cable securely.
- Connect to Remote Lever: Attach the other end of the cable to your handlebar-mounted remote control lever, ensuring proper tension and function.
Video: Product demonstration and installation guide.
5. Initial Setup and Adjustments
Proper setup is crucial for optimal performance and rider comfort. The DNM AO-38RC offers several adjustment options:
5.1. Air Pressure Adjustment
The main air chamber allows for adjustment of the shock's firmness. It is recommended to use a high-pressure pump with a pressure gauge for accurate inflation. The maximum air pressure is 270 PSI.
5.2. Damping Adjustment
The red damping adjustment button (labeled '3' in the structure diagram) controls the rebound speed of the shock absorber. Rotate it to increase or decrease damping:
- Clockwise rotation: Increases damping (slower rebound).
- Counter-clockwise rotation: Decreases damping (faster rebound).
5.3. Compression Adjustment / Lock Switch
The lock switch (labeled '1' in the structure diagram) controls the compression adjustment, effectively locking out the shock for a more rigid ride.
- '+' direction (clockwise): Locks the shock absorber.
- '-' direction (counter-clockwise): Opens the shock absorber.
6. Operation
The DNM AO-38RC shock absorber is designed for ease of use, offering both manual and wire-controlled options for its locking mechanism.
Manual Control:
For manual control versions, the lock switch is located directly on the shock absorber. To engage or disengage the lockout, you will need to reach down and turn the switch by hand.
Wire Control:
For wire-controlled versions, a remote lever is mounted on your handlebars. This allows you to conveniently control the lockout function without taking your hands off the handlebars, providing quick adjustments while riding.
7. Maintenance
Regular maintenance will prolong the life and performance of your DNM AO-38RC Air Rear Shock.
- Cleaning: After each ride, especially in dirty or wet conditions, clean the shock absorber with mild soap and water. Avoid high-pressure washers directly on seals.
- Lubrication: Keep the exposed shaft clean and lightly lubricated with a suspension-specific lubricant.
- Inspection: Periodically check for any signs of wear, damage, or air leaks. Pay close attention to seals and mounting hardware.
- Air Pressure: Check air pressure regularly and adjust as needed to maintain your preferred sag and performance.
- Professional Service: For internal service or if you notice significant performance degradation, it is recommended to have the shock serviced by a qualified technician.
8. Troubleshooting
Here are some common issues and potential solutions:
- Loss of Air Pressure: Check the air valve for proper sealing. If the issue persists, inspect the shock for external damage or consult a professional.
- Poor Damping Performance: Adjust the damping knob. If the shock feels too bouncy or too slow, fine-tune the red adjustment knob.
- Lockout Not Engaging/Disengaging: For wire-controlled versions, check the cable tension and ensure the cable is not frayed or stuck. For both versions, ensure the lock switch is fully rotated to the desired position.
- Unusual Noises: Inspect all mounting bolts for tightness. If noises persist, it may indicate internal issues requiring professional inspection.
9. Specifications
| Feature | Specification |
|---|---|
| Brand | DNM |
| Model Number | AO-38RC / AO-38RL |
| Material | Alloy |
| Use | Mountain Bikes |
| Lengths Available | 165mm, 190mm, 200mm, 210mm |
| Stroke (for respective lengths) | 165mm: 35±2mm, 190mm: 50±2mm, 200mm: 53±2mm, 210mm: 53±2mm |
| Max Air Pressure | 270 PSI |
| Control Type | Wire Control / Manual Control |
| Features | Adjustable Damping, Compression Adjustment, Air Pressure Adjustment, Shock Absorber Locking |
10. User Tips
- For optimal performance, experiment with different air pressure settings to find the 'sag' that best suits your weight and riding style.
- When adjusting damping, make small incremental changes and test them on familiar terrain to feel the difference.
- Utilize the lockout feature on climbs or smooth sections of trail to improve pedaling efficiency.
- Always carry a small shock pump on rides for on-the-fly air pressure adjustments.
11. Warranty and Support
For warranty claims, technical support, or replacement parts, please contact the authorized DNM dealer or the point of purchase. Keep your proof of purchase for any warranty-related inquiries. Ensure all installation and maintenance procedures are followed as outlined in this manual to maintain warranty validity.