Introduction
The DNM DV22AR is a high-quality coil spring hydraulic rear shock absorber designed for mountain bikes (MTB). It features a 2-system damping mechanism with adjustable rebound and preload, providing stable performance across various terrains. This manual provides essential information for the proper setup, operation, maintenance, and troubleshooting of your DV22AR shock absorber.
Figure 1: DNM DV22AR Shock Absorber variants.
Setup
1. Installation
Ensure the shock absorber is compatible with your bicycle frame's eye-to-eye length and travel. The DV22AR is available in various lengths including 125mm, 150mm, 165mm, 190mm, and 200mm. The eyelet inner diameter is 8mm and the eyelet width is 24mm. Use appropriate mounting hardware for your specific bike model.
Figure 2: Dimensions of the DV22AR shock absorber and eyelet bushings.
2. Adjustments
The DV22AR features both preload and rebound adjustments to fine-tune your ride experience.
Preload Adjustment
Preload refers to the initial compression of the spring. It can be adjusted by rotating the collar at the top of the spring. Turning the collar clockwise increases preload, making the suspension stiffer, while turning it counter-clockwise decreases preload, making it softer. Adjust preload to achieve the desired sag for your weight and riding style.
Rebound Adjustment
Rebound controls the speed at which the shock absorber extends after compression. The red knob at the top of the shock absorber is for rebound adjustment. Turning the knob clockwise slows down the rebound speed, preventing the wheel from “pogo-sticking” over bumps. Turning it counter-clockwise increases rebound speed, allowing the suspension to recover faster for successive impacts.
Figure 3: Rebound adjustment knob (red).
Operation
Once installed and adjusted, the DV22AR shock absorber will provide a smoother ride by absorbing impacts from the terrain. The hydraulic damping system, combined with the coil spring, ensures stable performance even on complex trails.
The rebound control feature helps maintain tire contact with the ground, improving traction and control. As demonstrated in the video, the shock absorber effectively reduces vibration amplitude compared to a system without damping, leading to a more comfortable and controlled ride.
Video 1: Demonstration of DNM DV22AR shock absorber rebound adjustment and performance on a mountain bike, including a graph illustrating vibration reduction.
Maintenance
Regular maintenance will prolong the life and performance of your shock absorber.
- Cleaning: After each ride, especially in wet or muddy conditions, clean the shock absorber with mild soap and water. Rinse thoroughly and dry with a soft cloth. Avoid high-pressure washers directly on seals.
- Inspection: Periodically check for any signs of damage, leaks, or excessive wear on the shaft, seals, and spring. Ensure all mounting bolts are securely tightened to the manufacturer's recommended torque specifications.
- Lubrication: Keep the damper shaft clean and lightly lubricated with a suspension-specific lubricant to ensure smooth operation and protect the seals.
- Professional Service: For internal maintenance, seal replacement, or if you notice any significant performance degradation, it is recommended to seek service from a qualified bicycle mechanic or an authorized DNM service center.
Troubleshooting
- Loss of Damping: If the shock feels bouncy or lacks control, the damping system might be compromised. Check for oil leaks around the seals. This usually requires professional service.
- Incorrect Sag/Bottoming Out: Adjust the preload to achieve the correct sag for your weight. If the shock frequently bottoms out, a higher spring rate might be necessary.
- Excessive Noise: Check all mounting hardware for tightness. Ensure the spring is seated correctly. If noise persists, it may indicate an internal issue requiring inspection by a professional.
- Stiff or Sticky Operation: Clean and lubricate the damper shaft. Check for any debris or damage to the seals.
Specifications
| Feature | Specification |
|---|---|
| Model Number | DNM DV22AR |
| Material | Aluminum/Alloy |
| Damping System | 2-system Hydraulic |
| Adjustments | Rebound / Preload |
| Damper Shaft | Hard chromed shock Ø 10 mm (0.39 inch) |
| Shock Body | Dark hard-anodized AL-6061 (one piece) |
| Spring Type | Coil spring |
| Riding Style | XC / AM (Cross Country / All Mountain) |
| Eye to Eye x Travel Options | 125mm, 150mm, 165mm x 35mm (6.50" x 1.38"), 190mm x 50mm (7.48" x 1.97"), 200mm x 55mm (7.87" x 2.17") |
| Spring Rate Options | 350LBS, 450LBS, 550LBS, 650LBS, 750LBS, 850LBS, 1000LBS, 1500LBS (depending on model/length) |
| Eyelet Inner Diameter | 8mm |
| Eyelet Width | 24mm |
User Tips
- Compatibility Check: Always verify the eye-to-eye length and travel of your bike's existing shock absorber before purchasing a replacement. While the DV22AR is versatile, specific frame designs may require particular dimensions.
- Spring Rate Selection: When replacing an air shock with a coil shock, or if you're unsure about the correct spring rate (LBS), consult a bike shop or an online calculator that considers your weight, riding style, and bike's leverage ratio. An incorrect spring rate can negatively impact performance and comfort.
- Initial Setup: Take the time to properly set your sag and rebound. These adjustments significantly affect how your bike handles and feels on the trail. Experiment with small changes to find your optimal settings.
Warranty and Support
For warranty claims, technical support, or replacement parts, please contact the seller or the manufacturer directly. Keep your purchase receipt as proof of purchase. Ensure all installation and maintenance procedures are followed to avoid voiding any potential warranty.
