Upgrading Your Suspension with Tune Shock SK18 Rear Shocks

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Overview of Tune Shock SK18 Rear Shocks

The Tune Shock SK18 [paid link] from Trunnion is a

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high-performance rear shock designed to provide exceptional comfort and control for serious road cyclists. Whether you’re tackling rugged [paid link] trails or navigating technical terrain, the SK18 rear shock offers a refined suspension experience, allowing for improved shock absorption and ride quality. This guide will take you through the installation, adjustment, maintenance, and troubleshooting of the Tune Shock SK18 [paid link], as well as offer insights into optimizing it for superior performance.

Tools Required

  • Torque wrench [paid link]
  • Allen wrenches [paid link] (sizes: 4mm, 5mm, 6mm)
  • Shock pump
  • Grease
  • Rags for cleaning
  • Needle nose pliers (for lock rings and adjustments)
  • Suspension oil (for maintenance)

Installation of Tune Shock SK18 Rear Shock

Installing the Tune Shock SK18 is a straightforward process, but it is critical to ensure everything is aligned and properly torqued to guarantee optimal performance and safety.

Step-by-Step Installation Guide

  1. Remove the Existing Shock:
    • Start by removing the existing shock from your bike frame. Use the appropriate Allen wrench [paid link] to unscrew the mounting bolts that secure the shock to the frame. Make sure to keep the bolts in a safe place, as you will need them for the new shock installation.
  2. Prepare the New Tune Shock SK18:
    • Before installing the new shock, check that the Tune Shock SK18 is properly set up for your bike frame. Verify the shock’s length, stroke, and mounting hardware to ensure compatibility. Use a grease to lubricate the shock eyelets for smoother operation.
  3. Position the Shock on the Mounting Bracket:
    • Place the shock onto the mounting bracket, ensuring the shock’s eyelets align with the frame mounts. Carefully slide the shock into position. You may need to gently compress the shock if it’s a tight fit.
  4. Secure the Shock:
    • Use your Allen wrenches [paid link] to install and tighten the bolts that secure the shock to the frame. Make sure each bolt is tightened to the manufacturer’s recommended torque specifications to prevent over-tightening or under-tightening.
  5. Check for Play or Movement:
    • After securing the shock, check for any play or movement by gently pulling on the shock. There should be no noticeable shift between the shock and frame once properly mounted.
  6. Adjust the Suspension Settings:
    • Adjust the air pressure and damping settings based on your weight, riding style, and terrain. Use a shock pump to set the air pressure according to the specifications for your body weight. Fine-tune the rebound and compression settings for your desired ride feel.

Adjusting Your Tune Shock SK18

Once installed, the Tune Shock SK18 can be fine-tuned for a customized ride experience. Here’s how to make adjustments to the air pressure and damping settings.

Adjusting Air Pressure

  • Use a Shock Pump: Attach the shock pump to the air valve located on the top of the shock. Increase or decrease air pressure to achieve the recommended sag. For the Tune Shock SK18, the typical sag range is between 25% and 30% of the total shock stroke.
  • Testing the Sag: After setting the air pressure, sit on the bike in a riding position and check the shock’s compression. You should see the shock compress by the recommended percentage when you mount the bike. If the sag is too much or too little, adjust the air pressure accordingly.

Fine-Tuning the Damping

  • Rebound Damping: Use the rebound knob to adjust how quickly the shock returns after compression. For faster terrain, you may want a slightly faster rebound, while on rougher trails, slower rebound might be preferred for better control.
  • Compression Damping: Adjust the compression knob to fine-tune how much the shock compresses under load. A stiffer compression setting can help you maintain control over technical terrain, while a softer setting allows for more comfort on smoother trails.

Maintaining the Tune Shock SK18

Proper maintenance is crucial to ensuring the longevity and performance of your Tune Shock SK18. Regular cleaning and periodic servicing will prevent wear and ensure that your shock continues to function smoothly.

Cleaning the Shock

  • Wipe Down the Shock: After each ride, clean the shock with a damp rag to remove dirt and debris. Make sure not to use harsh chemicals that could damage the shock’s components.
  • Lubricate the Eyelets: Periodically apply a small amount of suspension grease to the shock eyelets to prevent wear and ensure smooth movement when the shock is compressed and extended.

Servicing the Shock

  • Check for Leaks: Inspect the shock for any signs of fluid leakage, particularly around the seals. If you notice any oil or air leaks, it may be time for a rebuild or seal replacement.
  • Suspension Fluid Change: For optimal performance, change the suspension oil in your Tune Shock SK18 after every 100 hours of riding or annually, whichever comes first. This helps maintain consistent damping and performance.

Troubleshooting Common Issues

While the Tune Shock SK18 is a highly reliable component, you may encounter some issues during its use. Here are common problems and their solutions:

1. Shock Bottoming Out

  • Cause: Insufficient air pressure or a lack of compression damping.
  • Solution: Increase the air pressure to ensure the shock is properly set up for your weight. If the issue persists, increase the compression damping to prevent excessive shock compression under load.

2. Rebound is Too Slow or Too Fast

  • Cause: Incorrect rebound damping settings.
  • Solution: Adjust the rebound knob in small increments to achieve the desired rebound speed. If the shock feels too slow to return after compression, turn the knob clockwise to speed it up. If it’s too fast, turn the knob counterclockwise.

3. Shock Feels Too Harsh or Too Soft

  • Cause: Incorrect air pressure or damping settings.
  • Solution: Recheck the air pressure and adjust it to ensure it falls within the recommended range for your weight. Additionally, fine-tune the compression damping to achieve a comfortable, controlled ride.

Customizing the Tune Shock SK18 for Better Performance

The Tune Shock SK18 can be tailored to fit your specific riding style and terrain preference. Here are a few ways to optimize its performance:

  • Change the Air Spring: Consider experimenting with different air springs to adjust the ride feel. A stiffer air spring can be ideal for aggressive riders or rougher trails, while a softer air spring may be more comfortable for casual rides.
  • Optimize Compression and Rebound: For more technical riding, you might want a firmer compression setting and a slower rebound to maintain better control on steep descents. For endurance rides, a softer compression and faster rebound will improve comfort.

Compatibility with Other Drivetrain Components

The Tune Shock SK18 is compatible with most modern road bike drivetrains. However, when upgrading to this shock, it’s important to ensure that the overall suspension and drivetrain components work well together for optimal performance.

  • Rear Triangle Compatibility: Ensure the rear triangle of your bike frame can accommodate the shock’s mounting dimensions.
  • Drivetrain Integration: Check that your bike’s chain, cassette, and derailleur can function smoothly with the additional suspension feedback that comes from the rear shock. In some cases, upgrading your rear shock may require fine-tuning your drivetrain components for smoother shifts and power transfer.

Comparing Tune Shock SK18 to Other Rear Shocks

When considering rear shocks, it’s essential to compare the Tune Shock SK18 with similar models to determine which is best for your needs.

Tune Shock SK18 vs. FOX Float X2

  • Tune Shock SK18: Known for its lightweight and versatile [paid link] performance, offering excellent ride comfort across a wide range of conditions. Ideal for both casual riders and those looking for more refined suspension.
  • FOX Float X2: A more advanced shock with additional customization options and a focus on high-performance riders. The Float X2 is better suited for more aggressive riders looking for ultimate suspension control on steep descents and rough trails.

Tune Shock SK18 vs. RockShox Super Deluxe

  • Tune Shock SK18: Delivers a more balanced performance with an emphasis on comfort and ease of use. Ideal for riders who prioritize smoothness and consistent performance.
  • RockShox Super Deluxe: Offers a higher level of performance for aggressive riders. It comes with a more specialized feature set but can be overkill for those who ride more casually or on smoother terrain.

Conclusion

Upgrading to the Tune Shock SK18 rear shock offers significant improvements in comfort, control, and overall bike performance. By carefully installing, adjusting, and maintaining this shock, you can enhance your cycling experience, ensuring smoother rides and more efficient handling. With the right adjustments and care, the Tune Shock SK18 will provide years of reliable performance, whether you’re riding trails or handling technical terrain.