Introduction
This manual provides detailed instructions for the installation, operation, maintenance, and troubleshooting of your MEROCA MR-2 MTB Bike Air Shock Absorber. Please read this manual thoroughly before use to ensure proper function and longevity of your product.
Important Note: The MR-2 air pressure shock absorber features a single air chamber and DOES NOT support damping adjustment. This means the rebound speed cannot be independently adjusted.
Specifications
| Attribute | Detail |
|---|---|
| Brand | MEROCA |
| Model | MR-2 |
| Product Name | Air Pressure Shock Absorber |
| Material | High-strength Aluminum Alloy |
| Lengths Available | 125mm, 150mm, 165mm, 190mm |
| Travel (Journey) | 20mm (for 125mm), 30mm (for 150mm), 35mm (for 165mm), 50mm (for 190mm) |
| Bushing Size | 24*8mm |
| Weight (Approx.) | 240g (125mm), 248g (150mm), 259g (165mm), 276g (190mm) |
| Valve Type | American Valve |
| Damping Adjustment | Not supported (single air chamber) |
Components and Key Features
- High-Quality Aluminum Alloy: Constructed from high-strength and durable aluminum alloy, providing excellent hardness, anti-corrosion, and anti-rust properties.
The MR-2 is made from high-quality aluminum for durability. - Adjustable Air Pressure: The shock absorber allows for adjustment of air pressure to control the softness or hardness, optimizing the shock-absorbing effect for different riding conditions.
The red knob indicates the air valve for pressure adjustment. - Stroke Seal: Equipped with a weatherproof, waterproof, and dustproof stroke seal to effectively protect the inner tube and prolong the life of the shock absorber.
The blue ring indicates the stroke seal for protection. - American Valve: Features a standard American valve for easy inflation and pressure adjustment.
The American valve allows for easy air pressure adjustments. - Lightweight Design: Engineered for stability and lightness, reducing the overall burden on your bicycle.
The lightweight design contributes to a reduced bike weight. - Bushing: Standard 24*8mm bushing for compatibility.
Detail of the 24x8mm bushing.
Installation and Setup
Proper installation is crucial for the performance and safety of your shock absorber. If you are unsure about any steps, please consult a professional bicycle mechanic.
- Preparation: Ensure your bicycle frame is compatible with the selected length of the MEROCA MR-2 shock absorber (125mm, 150mm, 165mm, or 190mm). Gather necessary tools, including a torque wrench, appropriate Allen keys, and a high-pressure shock pump.
- Remove Old Shock (if applicable): Carefully remove the existing shock absorber from your bicycle, noting the orientation and any spacers or hardware.
- Install Bushings: The MR-2 shock absorber comes with 24*8mm bushings. Ensure these are correctly installed into the shock eyelets.
- Mount the Shock Absorber: Position the MEROCA MR-2 shock absorber into the frame's mounting points. Insert the mounting bolts through the frame and shock eyelets.
- Tighten Bolts: Hand-tighten the mounting bolts first. Then, using a torque wrench, tighten them to your bicycle manufacturer's specified torque settings. Overtightening can damage the frame or shock, while undertightening can lead to play and unsafe riding conditions.
- Initial Air Pressure Setting: Before riding, set the initial air pressure. Refer to the "Operating Instructions" section for guidance on adjusting air pressure. Start with a lower pressure and gradually increase it to achieve your desired sag and feel.
Always double-check all bolts and connections before your first ride after installation.
Operating Instructions: Air Pressure Adjustment
The MEROCA MR-2 shock absorber's performance is primarily tuned by adjusting its air pressure. This allows you to customize the softness or hardness to suit your weight, riding style, and terrain.
- Access the Air Valve: Locate the American valve on the shock absorber, typically covered by a cap. Unscrew the cap.
- Attach Shock Pump: Securely attach a high-pressure shock pump to the valve. Ensure it's threaded on straight to prevent air leaks.
- Adjust Pressure:
- To Increase Hardness (firmer ride): Pump air into the shock using the shock pump.
- To Decrease Hardness (softer ride): Slowly release air using the bleed button on your shock pump.
Adjust the air pressure incrementally. A common method is to set the "sag" – the amount the suspension compresses under your body weight. Typically, for MTB rear shocks, sag is set between 25-35% of the total travel.
- Check Sag: Sit on your bike in your normal riding position (with all riding gear). Have someone measure the distance the shock compresses. Adjust pressure until the desired sag percentage is achieved.
- Remove Pump and Replace Cap: Once the desired pressure is set, carefully remove the shock pump and replace the valve cap to protect the valve from dirt and moisture.
Remember: The MR-2 does not have damping adjustment. The feel of the shock will be solely determined by the air pressure.
Maintenance
Regular maintenance will ensure optimal performance and extend the lifespan of your MEROCA MR-2 shock absorber.
- Clean Regularly: After each ride, especially in dirty or wet conditions, wipe down the shock absorber with a clean, damp cloth. Pay attention to the exposed shaft and seals. Avoid using high-pressure washers directly on the seals.
- Inspect Seals: Periodically check the stroke seal (blue ring) for any signs of wear, cracking, or damage. A damaged seal can lead to air leaks and reduced performance.
Ensure the stroke seal is clean and undamaged. - Check Air Pressure: Air pressure can fluctuate over time. Check your shock's air pressure with a shock pump before every few rides or if you notice a change in performance.
- Lubrication: A small amount of suspension-specific lubricant can be applied to the exposed shaft to keep the seals supple and reduce friction. Consult a bike shop for appropriate lubricants.
- Bolt Torque: Periodically check the torque of the mounting bolts to ensure they are tightened to the manufacturer's specifications.
- Storage: Store your bicycle in a clean, dry environment away from extreme temperatures and direct sunlight.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Shock feels too soft/bottoms out easily | Insufficient air pressure | Increase air pressure using a shock pump. Refer to "Operating Instructions". |
| Shock feels too hard/stiff | Excessive air pressure | Release air pressure slowly using the bleed button on your shock pump. Refer to "Operating Instructions". |
| Air leaks from valve | Loose valve core or damaged valve cap | Tighten valve core with a valve core tool. Ensure valve cap is securely in place. If leak persists, valve core may need replacement. |
| Air leaks from seals | Damaged or worn stroke seal | Inspect the stroke seal for damage. If damaged, it may need replacement by a qualified technician. |
| Unusual noises (creaking, clunking) | Loose mounting bolts, worn bushings, or internal issue | Check and re-torque mounting bolts. Inspect bushings for wear. If noises persist, seek professional inspection. |
User Tips
- Experiment with Pressure: Don't be afraid to experiment with different air pressures to find the setting that feels best for your weight and riding style. Small adjustments can make a big difference.
- Regular Sag Checks: Your sag can change over time due to temperature fluctuations or minor air loss. Check it periodically to maintain consistent performance.
- Cleanliness is Key: Keeping the shock clean, especially the shaft and seals, is the easiest way to prevent premature wear and maintain smooth operation.
Warranty and Support
For warranty information, technical support, or service inquiries, please contact the retailer or manufacturer directly. Keep your proof of purchase for any warranty claims.
Ensure all installation and maintenance procedures are followed as outlined in this manual to avoid voiding any potential warranty.