DNM AO-8RC Bicycle Air Shock Absorber User Manual

Introduction

Congratulations on your purchase of the DNM AO-8RC Bicycle Air Shock Absorber. These shock absorbers are engineered with lightweight, high-strength materials to provide high performance, ease of use, and simple maintenance for your mountain bike. This manual provides essential information for safe installation, operation, and maintenance to ensure an enjoyable and trouble-free riding experience.

For a comprehensive manual, you can also refer to the official PDF: DNM AO-EN_1.pdf

Safety Information

Warning: Always wear a safety helmet, protective clothing, and eye protection when riding. Do not exceed your limits. Maintain your bike and suspension regularly.

Never modify your shock or bike frame. Modifications can lead to a broken or malfunctioning shock, serious injury, or premature termination of life.

Do not disassemble or service your shock if it is compressed or has not returned to its original length without any load. If unusual noises or oil loss occur, return it to a DNM authorized dealer for service. Use only genuine DNM parts.

Do not use the locked-out system during jump riding, as this is considered very dangerous.

Product Overview

The DNM AO-8RC is an air shock absorber designed for Mountain Bikes (XC / TRAIL / AM / MTB). It features a hard-anodized shaft and black shock body, made from 7075+6061 aluminum alloy. It offers adjustable compression, rebound, negative air spring, and a lock-out function.

Specifications

Setup

Installation of a New Shock

1. Determine Shock Length: Measure from mounting eyelet to eyelet using calipers or a metal ruler.
2. Determine Bushing Width: Measure the width of the aluminum sleeves at both ends of the shock. The gap where the shock mounts on the frame and swing arm should match this width.
3. Clearance for Travel: If extending travel, ensure sufficient clearance for the full travel of the rear swing arm. For external reservoir (piggyback) shocks, ensure it fits your frame without causing damage.
4. Fitting the New Shock: Remove the old shock, clean the inside surfaces of the frame and swing arm. Position the new shock, considering access to adjusters. Use appropriate tools (e.g., 5mm Allen key, 10mm open-ended spanner).
5. Tightening: Tighten with medium pressure. Nylock nuts and Loc-tite fastening solution are recommended.
6. Initial Test: Gently sit on the bike and progressively apply pressure. If there are no strange noises, the installation is likely successful.
7. Fine Tuning: Adjust ride height using the collar on the main shock body. Control rebound speed with the red adjuster and compression damping with the blue adjuster. These adjustments are variable and should be tuned periodically based on riding conditions.

SAG Set-up Instructions

For optimal performance, adjust the SAG (Static Air Gap) based on your weight and riding style. SAG is the amount the shock compresses when the rider is sitting on the bike in a normal riding position. The recommended displacement percentage is 15-25% of full travel for cross-country and approximately 25% for downhill applications.

Note: The above numbers are for reference only. Air pressure depends on rider's weight and frame specification.

Operating the Shock Absorber

Key Functions

• Compressing Damping: Resistance felt when compressing the shock.
• Rebound Damping: Force needed to compress the spring.
• Preload: Amount of static force placed on the spring.
• Spring Rate: Force needed to compress the spring.
• Shock Sag: Amount the shock compresses when the rider is seated.
• Lock-Out: A unique DNM device that allows the rider to choose different riding styles. It locks the movement of the shock, reducing suspension travel for climbing or fast acceleration.
• Remote Lock-Out: Allows operation of the Lock-Out system from handlebars via a thumb shifter.

Adjustments

• Air Pressure Adjustment: The air valve mouth is used to adjust the air pressure. Maximum air pressure is 275psi. Increasing air pressure makes the shock harder, decreasing it makes it softer. Negative air pressure should be between 50psi and 80psi.
• Damping Adjustment Knob (Red): Controls the speed at which the shock rebounds. Turning '+' slows rebound, turning '-' speeds it up.
• Deadlock Switch (Blue): This is a 3-stage adjustable switch:
  • LOCK: Turns off the shock absorber.
  • OPEN: Opens the shock absorber.
  • MIDDLE: Half suspension.

Maintenance

• Do Not Disassemble: Do not attempt to disassemble the shock yourself. Contact your nearest DNM authorized service center for any malfunctions. The internal air is nitrogen-filled, and self-disassembly will void the warranty.
• Air Pressure: The shock is filled with 150psi during production. Maximum air pressure is 250psi. Negative air chamber pressure is 50psi (maximum 80psi).
• Regular Cleaning: After muddy rides, clean the main shaft, dust seal, and bumper rubber with soap and water. Avoid high-pressure washers.
• Bearing Sleeves: After approximately 5000km of riding, remove, clean, grease, and replace the mount bearing sleeves.
• Pre-Ride Check: Before each ride, check and adjust the main air spring pressure and negative air spring pressure to your desired level.
• Adjusting Hardness: If you need to adjust the shock harder or softer, always adjust the air pressure to match your sag.

Troubleshooting

If your shock absorber makes unusual noises or loses oil, do not attempt to repair it yourself. This indicates a potential issue that requires professional attention. Please return the shock to a DNM authorized dealer for inspection and service to prevent further damage or injury.

User Tips

• Always ensure your SAG is correctly set for your weight and riding style. This is crucial for optimal performance and comfort.
• Regularly check air pressure before each ride, especially if you notice changes in handling or comfort.
• Familiarize yourself with the rebound and compression adjustments. Small changes can significantly impact your ride feel on different terrains.
• Keep the shock clean, especially after riding in wet or muddy conditions, to prolong its lifespan and maintain performance.

Warranty and Support

Terms and Conditions / Limited Warranty

• DNM warrants its fork or shock for one year from the date of purchase to the original purchaser. This warranty is not transferable to third parties.
• Warranty covers defects in materials and workmanship. All forks must be returned to DNM for inspection. Defective products will be replaced or repaired.
• Warranty does not cover improper installation, adjustments not outlined in this manual, misuse, missing or altered serial numbers, or normal wear and tear.
• In case of a defect, contact your dealer or a DNM service center. A copy of the proof of purchase is required.
• If a product needs replacement and is discontinued or unavailable, DNM reserves the right to replace it with one of equal value. No refunds will be provided.

Disclaimer

DNM is not responsible for any damages arising from riding, transporting, or any other use of your shock or bicycle. In case your shock breaks or malfunctions, DNM's liability is limited to the repair or replacement of the shock, as per the terms and conditions outlined in this manual.

Contact Information

For other regional support and dealer information, please refer to the official user manual PDF.