The Tune Shock SK18 [paid link] from Trunnion is a high-performance rear shock designed for riders seeking an optimized ride. Whether you’re riding on rugged [paid link] trails or smooth roads, this shock offers impressive dampening and adjustability. Regular maintenance and proper setup can extend its lifespan and enhance your bike’s performance. This guide provides expert-level instructions on how to install, adjust, maintain, and troubleshoot the Tune Shock SK18 [paid link] to ensure optimal performance.
Tools Required
- Shock pump
- Allen wrenches [paid link] (specific sizes depending on the bolt type)
- Torque wrench [paid link]
- Clean rags or towels
- Isopropyl alcohol
- Lubricant (specifically for suspension parts)
- Replacement seals (if needed)
- Cleaning brush (soft-bristled)
- 5mm and 8mm socket wrenches
Installation of the Tune Shock SK18
Installing the Tune Shock SK18 on your bike requires attention to detail to ensure proper alignment and secure attachment. Here’s a step-by-step guide to getting your shock mounted properly.
- Remove the Old Shock (if applicable)
- Begin by removing the current rear shock from your bike frame. Use the appropriate Allen wrenches [paid link] to detach the shock from the frame.
- Carefully inspect the mounting hardware for any signs of wear or damage. If any part is worn out, replace it to ensure a secure installation of the new shock.
- Prepare the Tune Shock SK18
- Before mounting, ensure the shock is clean and free of debris. Use a soft rag and some isopropyl alcohol to wipe down the shock.
- Verify that the air pressure is set to the manufacturer’s recommended level using a shock pump. This is crucial for ensuring the shock’s proper performance.
- Mount the Shock on the Frame
- Align the Tune Shock SK18 with the rear triangle of the frame, ensuring that the mounting hardware fits correctly into the designated shock mounts.
- Tighten the bolts using a torque wrench [paid link], applying the manufacturer-recommended torque specification. Over-tightening or under-tightening can damage the shock or cause poor performance.
- Recheck Alignment and Secure Tightness
- Double-check the alignment of the shock and ensure there is no play or misalignment. Tighten the bolts fully but carefully, checking that all parts are secure.
Adjustment of the Tune Shock SK18
Adjusting the Tune Shock SK18 ensures that the shock provides optimal performance based on your weight, riding style, and terrain. Here’s how you can adjust it:
Air Pressure Adjustment
The Tune Shock SK18 uses air to control spring rate, so adjusting the air pressure is key to achieving the right ride feel.
- Check the Recommended Pressure
- Refer to the manufacturer’s recommendations for air pressure based on your body weight and riding style. The air pressure affects the shock’s responsiveness and comfort.
- Use the Shock Pump to Adjust Pressure
- Attach a shock pump to the valve and adjust the air pressure as needed. Start by setting the pressure low and gradually increasing it until you reach the desired pressure.
- It’s important not to overinflate the shock. Ensure that the shock’s sag is within the recommended range (usually 25-30% of the total shock stroke).
Rebound and Compression Adjustment
The Tune Shock SK18 features a rebound and compression adjustment that allows you to fine-tune the shock for various conditions.
- Rebound Adjustment
- Rebound controls the rate at which the shock returns to its normal position after compression. Turning the rebound adjuster counterclockwise slows down the rebound, while turning it clockwise increases the rebound speed.
- Test the rebound setting by compressing the shock and releasing it, noting how quickly it returns. Adjust until the shock returns at a comfortable rate for your riding style.
- Compression Adjustment
- Compression damping determines how quickly the shock compresses when it hits a bump or obstacle. Turn the compression knob clockwise to increase compression damping, which can be helpful on rough terrain.
- For smoother rides, adjust the compression to a softer setting. Test your settings in different conditions to find the optimal setting.
Maintenance of the Tune Shock SK18
Regular maintenance is vital to ensure the longevity and smooth operation of your Tune Shock SK18. Follow these steps to keep it in peak [paid link] condition.
Clean the Shock Regularly
A clean shock performs better and lasts longer. Here’s how to clean your Tune Shock SK18:
- Wipe Down After Every Ride
- Use a clean rag to wipe off dirt and grime from the shock. Focus on the body and seals, as accumulated debris can cause wear.
- Deep Clean Periodically
- Every few weeks, disassemble the shock to perform a deeper clean. Use a soft-bristled brush to gently scrub the shock’s body. Be sure not to damage any of the shock’s delicate components.
Lubricate the Shock
Proper lubrication of the shock’s moving parts prevents premature wear and maintains smooth performance. Apply lubricant to the shock’s seals and linkage points regularly.
Inspect the Seals
The seals on the Tune Shock SK18 are crucial for maintaining air pressure and preventing contamination. Check for leaks or damage to the seals and replace them if needed. Worn seals can significantly degrade the shock’s performance.
Service the Shock
Every 50-100 hours of riding, or once a year, it is a good idea to send your shock for a full service. This involves a complete disassembly, cleaning, and re-lubrication. If you’re comfortable with advanced bike maintenance, you can do this yourself, but it’s recommended to leave it to a professional mechanic if you lack experience.
Troubleshooting Common Set-Up Issues
While the Tune Shock SK18 is a reliable component, you may encounter some common issues. Here’s how to troubleshoot:
Shock Not Holding Air Pressure
- Check for Leaks
- If your shock is losing air, check for any visible signs of damage or punctures on the air chamber. A worn-out valve can also cause air loss. If you detect a leak, replace the valve core or the shock seals.
- Over-Inflation
- If the shock feels too stiff or harsh, you might have over-inflated it. Check the air pressure and adjust it to the recommended level.
Unstable Rebound
- Rebound Setting Too High or Low
- If the shock rebounds too quickly or too slowly, adjust the rebound setting to find a balance. You may need to fine-tune it multiple times to achieve the desired performance.
- Internal Damage
- If rebound issues persist despite adjustment, the internal components of the shock might be damaged. In such cases, a professional service is required to address the problem.
Customization and Optimization for Better Performance
For riders looking to extract the maximum performance from their Tune Shock SK18, consider these optimization tips:
- Adjust to Terrain
- Tailor your shock settings to your riding conditions. For downhill trails, increase compression damping for better control, while reducing it for cross-country riding to improve comfort.
- Upgrade the Shock Bushings
- Swapping out the stock bushings for high-quality options can improve responsiveness and reduce friction, leading to a smoother ride.
Compatibility with Other Drivetrain Components
The Tune Shock SK18 is compatible with most modern mountain bike drivetrains, but it’s important to ensure that your bike frame is designed for a trunnion mount rear shock. Always check your bike’s specifications for compatibility, especially regarding shock length, eye-to-eye distance, and shock mount type.
Common Drivetrain Pairings
- Shimano and SRAM Drivetrains: The Tune Shock SK18 works seamlessly with both Shimano and SRAM drivetrains, though you should always ensure proper rear triangle clearance and shock mount compatibility.
- Suspension Fork Pairing: Pair the rear shock with a suitable suspension fork to ensure balanced performance. The shock’s settings can be adjusted to complement the fork’s behavior, giving you a smooth and responsive ride.
Conclusion
Maintaining and optimizing your Tune Shock SK18 rear shock will keep your bike performing at its best, whether you’re tackling tough trails or enjoying a casual ride. By following the installation, adjustment, and maintenance steps outlined in this guide, you’ll extend the lifespan of your shock and enhance your riding experience. Regular cleaning, proper lubrication, and periodic servicing are key to keeping your rear shock in top condition for years to come.