The STX22 Coil rear shock from Öhlins is a high-performance component designed for serious mountain bikers and cyclists looking to upgrade their rear suspension for optimal control, comfort, and durability. In this guide, we’ll walk you through the installation, adjustment, maintenance, troubleshooting, and optimization of this shock. We’ll also compare it with similar models to help you understand its unique advantages and ensure compatibility with other drivetrain components.

Tools Required

• Shock pump
• 5mm Allen wrench [paid link]
• Torque wrench [paid link]
• Suspension fluid (recommended by the manufacturer)
• Grease (appropriate for suspension components)
• Soft cloth or rag
• Compression and rebound adjustment tools (specific to the STX22 Coil)

Installation of the STX22 Coil Rear Shock

Step 1: Remove the Existing Shock

Before installing the STX22 Coil rear shock, remove your current shock from the bike frame. Use the 5mm Allen wrench [paid link] to carefully remove the bolts securing the shock to the frame. Be sure to support the frame while doing this to prevent any damage to the suspension linkages.

Step 2: Prepare the Shock

Apply a light layer of grease to the mounting hardware and shock eyelets of the STX22 Coil. This helps ensure smooth operation and makes future disassembly easier. Make sure the shock is oriented correctly, with the reservoir facing the rear for proper air and oil flow.

Step 3: Install the New Shock

Align the mounting holes of the STX22 Coil with the frame’s shock mount locations. Insert the mounting bolts and tighten them to the manufacturer’s recommended torque specifications. Use the torque wrench [paid link] for accuracy to avoid damaging the shock or frame.

Step 4: Check for Proper Function

Once installed, compress the shock by pressing down on the rear triangle of the bike. Check for any unusual resistance or abnormal movement that might indicate improper installation. The shock should move smoothly without any significant play.

Adjustment of the STX22 Coil Rear Shock

The STX22 Coil offers several adjustment points, allowing riders to fine-tune their suspension for different terrain and riding styles. The primary adjustments include:

Compression Adjustment

The STX22 Coil features a high-speed and low-speed compression adjustment. These settings allow you to modify the damping characteristics of the shock. To adjust the compression:

• Turn the compression knob clockwise to increase resistance, reducing suspension travel and making the shock stiffer.
• Turn the knob counterclockwise to decrease resistance, which allows for more suspension travel and a softer ride.

This is particularly useful when adjusting for different trail conditions, such as rough terrain or smooth, flowy trails.

Rebound Adjustment

The rebound knob adjusts how quickly the shock returns to its neutral position after compression. A slower rebound can be beneficial in rougher terrain, as it provides more control, while a faster rebound can help reduce the shock’s “bobbing” effect on smoother trails.

• Turn the rebound knob clockwise to slow the return.
• Turn the knob counterclockwise to increase the return speed.

Spring Rate Adjustment

One of the key features of the STX22 Coil shock is the ability to choose the right spring rate for your weight and riding style. This ensures optimal performance, preventing either too much sag or not enough travel. The correct spring rate can be determined using the Öhlins spring calculator or by consulting with a suspension expert.

Maintenance of the STX22 Coil Rear Shock

Proper maintenance is crucial to ensure the longevity and performance of your STX22 Coil rear shock. Here’s a breakdown of the most important maintenance tasks:

Regular Cleaning

After each ride, clean the shock with a soft cloth or rag. Pay special attention to the shock’s eyelets, where dirt and debris can accumulate. Use suspension-specific cleaners or mild soap and water to avoid damaging the shock seals.

Lubrication and Inspection

Periodically inspect the shock for signs of wear, including oil leakage or damage to the seals. Lubricate the mounting hardware and eyelets lightly to prevent corrosion. Over time, you may need to replace the shock’s oil or seals—consult the manufacturer’s maintenance schedule for specific intervals.

Spring Replacement

Depending on your riding style and conditions, you may need to replace the coil spring. If you notice that the shock is bottoming out or doesn’t provide enough support, consider switching to a stiffer or softer spring.

Full Suspension Overhaul

Every 50-100 hours of riding, it’s recommended to do a complete suspension overhaul, which includes draining the old suspension fluid and replacing it with fresh oil. This ensures optimal damping performance and extends the life of your shock.

Troubleshooting Common Issues

While the STX22 Coil is a durable and reliable shock, riders may encounter a few common issues during use. Here are some potential problems and how to resolve them:

1. Shock Bottoming Out

If the shock bottoms out too frequently, this may be a sign of insufficient spring rate or incorrect compression settings. To fix this:

• Check the spring rate and consider upgrading to a stiffer coil if necessary.
• Increase the compression setting to prevent the shock from bottoming out on bigger hits.

2. Excessive Rebound

If the shock rebounds too quickly or feels uncontrollable, try adjusting the rebound knob to slow it down. This will help keep the shock from bouncing uncontrollably after each hit.

3. Stiff or Sticky Shock

If you notice that the shock feels unusually stiff or sticky, this could be caused by dirty seals or inadequate lubrication. Clean the shock thoroughly and reapply lubrication to the mounting points. If the issue persists, inspect the seals for damage and replace them as needed.

4. Air or Oil Leaks

Any visible leaks from the shock’s eyelets or the reservoir should be addressed immediately. Leaking oil or air could indicate a damaged seal or a compromised shock. In this case, it is best to send the shock to an authorized service center for repair or replacement.

Customization and Optimization for Better Performance

The STX22 Coil rear shock offers several opportunities for customization, allowing riders to tune the suspension for their individual needs. Some optimization tips include:

1. Choosing the Right Spring Rate

As mentioned earlier, the right spring rate is crucial for optimal performance. Riders should choose a coil spring that matches their weight and riding style. Öhlins offers different spring rates, and it’s important to select one that provides the correct sag and support for your specific needs.

2. Fine-Tuning Damping Settings

Experiment with different compression and rebound settings to find the perfect balance between comfort and performance. Lighter riders may prefer a softer setting, while heavier riders may need a firmer setup.

3. Upgrading Mounting Hardware

Consider upgrading to higher-quality mounting hardware if you’re looking for smoother performance. Some riders opt for shock bushings or inserts that help reduce friction and provide a more responsive ride.

Comparison with Similar Models

When comparing the STX22 Coil to other rear shocks in the market, such as the RockShox Super Deluxe or the Fox DHX2, there are a few key distinctions:

• Performance: The STX22 Coil excels in offering consistent, linear progression, making it ideal for riders who prefer a more predictable and controlled feel. In contrast, models like the Fox DHX2 offer more versatility in terms of damping adjustments, allowing for more fine-tuned control.
• Customization: The STX22 Coil offers less customization compared to the RockShox Super Deluxe, which features a more advanced external damping adjustment system. However, the simplicity of the STX22 Coil makes it easier to maintain and tune for many riders.
• Weight: While the STX22 Coil is heavier than air shocks, it’s appreciated for its durability and reliability, especially for riders who prioritize a consistent feel over weight savings.

Compatibility with Other Drivetrain Components

The STX22 Coil rear shock is compatible with most modern mountain bike frames that feature standard shock mounting hardware. However, it’s essential to ensure that the shock’s eyelet size matches your bike frame’s shock mount. Additionally, riders should verify that the frame offers sufficient clearance for the shock’s reservoir.

To ensure smooth integration with other drivetrain components, make sure that the shock’s performance settings align with your bike’s geometry. For example, certain suspension designs may require specific rebound and compression settings for optimal handling.