The Tune Shock SK18 [paid link] rear shock from Trunnion is a high-performance component designed for mountain bikers who demand precision, comfort, and durability. Like any crucial component of a road or mountain bike, proper maintenance is essential to ensure its longevity and optimal performance. In this guide, we will cover the best ways to maintain, adjust, troubleshoot, and optimize your Tune Shock SK18 [paid link] to keep it functioning at its peak [paid link] for as long as possible.

Installation and Setup

Correct Installation of the Tune Shock SK18

Installing the Tune Shock SK18 rear shock requires careful attention to detail to avoid issues down the line. It is essential to follow the manufacturer’s specifications and use the correct tools for the job.

1. Prepare the Bike Frame: Ensure the rear triangle and shock mounting points are clean and free from any dirt or debris. This will prevent any contaminants from causing wear or damage to the shock or frame.
2. Insert the Shock: Position the Tune Shock SK18 in the frame’s rear shock mount, making sure the eyelet or trunnion mount is aligned properly.
3. Secure the Mounting Bolts: Use a torque wrench [paid link] to tighten the mounting bolts to the recommended torque values. Over-tightening or under-tightening the bolts can cause damage or affect performance.
4. Check the Shock Position: Once installed, ensure the shock is seated correctly and that there is no binding or misalignment.

Initial Setup

Once the shock is installed, it’s important to set it up according to your riding style and weight. The Tune Shock SK18 offers a range of tunability, including air pressure and rebound adjustments.

1. Set the Sag: Adjust the air pressure in the shock to achieve around 25-30% sag. This is typically done by using a shock pump and adjusting the pressure while sitting on the bike.
2. Rebound Adjustment: Set the rebound damping to a position where the shock returns slowly but not too fast. A good baseline is to adjust it to the midpoint and fine-tune from there based on your preferences.
3. Compression Damping: If applicable, adjust the compression damping to suit the type of terrain you ride. Start with a mid-range setting and adjust based on your experience.

Maintenance and Care

Regular Cleaning and Inspection

Routine maintenance is vital to extend the lifespan of your Tune Shock SK18. Cleaning the shock and inspecting it regularly helps prevent dirt and debris from building up, which can degrade the shock’s performance.

1. Clean the Shock: After every ride, wipe down the shock with a clean, damp cloth. Make sure to remove any mud, dirt, or dust from the shock body, seals, and air chamber.
2. Inspect the Seals: Check the seals for any signs of wear or damage. Replacing worn seals promptly will prevent air or oil leaks and ensure the shock performs properly.
3. Check the Mounting Bolts: Periodically check the bolts for tightness and make sure they are not loosening. This helps to avoid any unwanted movement or damage.

Re-grease the Shock Mounts

To prevent creaking and wear, it’s important to regularly re-grease the mounting points of the shock. Apply a thin layer of grease to the bushings and mounting hardware when servicing the shock to ensure smooth movement.

Air Pressure and Lubrication

Over time, the air pressure in the shock can decrease, affecting its performance. It’s essential to check and adjust the air pressure periodically to maintain the correct sag and shock feel.

1. Adjust Air Pressure Regularly: Use a shock pump to check and adjust the air pressure according to your weight and riding conditions. Recheck it after every few rides or if you notice changes in performance.
2. Lubricate the Shock: Apply a light coating of silicone-based lubricant to the shock shaft periodically to reduce friction and prevent the seals from drying out.

Troubleshooting Common Set-Up Issues

Lack of Rebound Control

If you notice that your shock rebounds too quickly or too slowly, there may be an issue with the rebound settings or the shock’s internal components.

• Solution: Double-check the rebound adjustment dial. If the issue persists, it could be due to oil loss or contamination inside the shock. In such cases, it may be necessary to service the shock by disassembling it, cleaning it thoroughly, and replacing any damaged parts.

Air Leaks

An air leak can cause a loss of pressure, affecting the performance and sag of the shock. This is a common issue, particularly if the shock is not properly sealed or has been exposed to harsh conditions.

• Solution: Inspect the air valve for any damage or dirt. If the valve appears compromised, replace it. If the issue persists, have the shock serviced at a professional shop to replace seals and fix any internal leaks.

Insufficient Compression or Damping

If the shock feels too soft or unresponsive during rides, it might indicate insufficient compression or damping.

• Solution: Check the compression settings and adjust them according to your preferences and riding style. If the damping feels inadequate even after adjustment, it could indicate an issue with the shock’s oil or internals. In such cases, servicing the shock will be necessary.

Customization and Optimization

Tuning the Shock for Better Performance

The Tune Shock SK18 offers various adjustments to optimize performance for different riders and terrains. Tuning the shock to suit your needs can significantly improve comfort, handling, and overall performance.

1. Compression Settings: For smoother trails or XC riding, a lighter compression setting is ideal. If you plan on tackling more technical or aggressive trails, increasing the compression will help reduce bottoming out and provide more control.
2. Rebound Settings: Fine-tuning the rebound settings based on the terrain and your riding style is crucial. A faster rebound is suited for smoother trails, while a slower rebound works better for rough terrain to keep the shock from bouncing uncontrollably.
3. Air Pressure Adjustments: Adjust the air pressure in accordance with changes in weight, riding conditions, or bike setup. Lighter riders may require less pressure, while heavier riders or those riding on rougher terrain may need to increase it.

Upgrading Components for Improved Performance

Consider upgrading components such as the shock bushings, seals, and air chambers to get the most out of your Tune Shock SK18. These upgrades can increase the shock’s responsiveness and durability, especially for aggressive riders or those who frequently ride in harsh conditions.

Compatibility with Other Drivetrain Components

Ensuring Compatibility with Your Frame

Before installing the Tune Shock SK18, make sure that your bike frame is compatible with the shock’s mounting style (eyelet or trunnion). Additionally, check that the frame’s suspension design aligns with the shock’s specifications to prevent any issues with mounting or performance.

Pairing with Drivetrain Components

While rear shock performance is independent of the drivetrain, optimizing the suspension and drivetrain components for a smoother, more efficient ride is key. Make sure that the gear ratios, chainline, and derailleur are correctly adjusted, as these can affect the overall feel and performance of the bike when paired with a high-performance shock like the SK18.

Conclusion

The Tune Shock SK18 is an excellent choice for riders looking to optimize their suspension setup. By following the installation, maintenance, and troubleshooting steps in this guide, you can ensure that your shock remains in top condition for years to come. With the right tuning and periodic servicing, the Tune Shock SK18 will continue to deliver outstanding performance on the trails.