DIY Rear Shock Sag Setup for TTX2Air

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When setting up your TTX2Air [paid link] rear shock from Öhlins, achieving the proper sag is one of the most critical steps for optimizing your bike’s suspension performance. Sag is the amount your shock compresses under your body weight, and it’s essential for balancing comfort, handling, and control. Incorrect sag can lead to a harsh ride, poor handling, and reduced performance, so it’s crucial to adjust it correctly. In this guide, we’ll walk you through the process of setting up rear shock sag for the Öhlins TTX2Air [paid link].

Understanding Sag and Its Importance

Before diving into the setup, it’s essential to understand why sag is important. The correct sag ensures that the suspension is neither too soft nor too firm. This balance allows the shock to react to terrain changes properly and ensures that the bike handles well across a range of conditions.

  • Too little sag can make the ride feel harsh, and you might struggle to maintain control over rough terrain.
  • Too much sag can cause the bike to wallow, compromising stability and performance.

For the TTX2Air, achieving the correct sag is vital for maintaining optimal performance and handling characteristics, especially on challenging trails.

Tools Required

  • Shock pump with gauge
  • Measuring tape
  • Marker or tape for body measurement
  • A helper (optional, but recommended)

Step-by-Step Guide to Setting Up Rear Shock Sag

Step 1: Prepare Your Bike and TTX2Air Shock

Ensure that your bike is on a stable surface, preferably in an upright position on a bike stand [paid link] or leaning against a wall. Before adjusting the sag, you must check that the TTX2Air shock is set to the correct air pressure. This will depend on your weight and riding style, which you can find in the shock’s manual or Öhlins’ recommended guidelines. Start by adjusting the air pressure to the suggested baseline.

Step 2: Check Your Riding Gear

Sag measurements must be taken while you’re in your riding gear, as your clothes and accessories (e.g., helmet, backpack) add weight to your overall load. If you’re planning to ride with these items frequently, it’s best to include them in the setup process.

Step 3: Set Your Shock Pressure

Using the shock pump, adjust the air pressure on your TTX2Air shock to your baseline setting. The TTX2Air comes with a high degree of adjustability, and the air pressure will vary depending on your body weight and riding style. Öhlins generally recommends a starting point of about 25-30% of the shock’s total travel for most riders. For example, if you have a 150mm travel shock, start with an air pressure that gives you about 37-45mm of sag.

Step 4: Measure the Sag

Now that the shock is properly pressurized, it’s time to measure the sag. To do this, you need to mark a reference point on your shock. Use a marker or a piece of tape on the shock shaft to indicate its uncompressed position (the “zero point”).

To measure sag, sit on your bike in your riding position, ensuring that you’re in the middle of the saddle with your full body weight on the bike. If possible, ask a helper to measure the distance between the reference mark on the shock and the shock’s actual compressed position when you are seated.

Step 5: Adjust the Air Pressure

If the sag measurement is off from your desired target (usually between 25% and 30% of the shock’s total travel), use the shock pump to adjust the air pressure.

  • If there is too much sag (more than 30%), add air to the shock to increase its pressure.
  • If there is too little sag (less than 25%), release some air to decrease the pressure.

After adjusting the air pressure, re-measure the sag to ensure you are within the desired range. It may take a few iterations to get the settings just right.

Step 6: Final Adjustments

Once you’ve achieved the correct sag, ensure that the shock feels balanced when riding. If you notice any odd handling or feel that the bike is either too harsh or too soft, consider fine-tuning your settings by making slight adjustments to the air pressure or adjusting the rebound and compression damping settings on the TTX2Air. These adjustments help fine-tune the shock’s responsiveness and rebound, which can be critical for specific trail conditions.

Troubleshooting Common Sag Setup Issues

While setting up the sag on the TTX2Air, you might run into a few common issues. Here’s how to resolve them:

  • Sag Doesn’t Stay Consistent: If your sag measurement fluctuates, check for any leaks or damage to the shock. Ensure the air valve is sealed tightly and that the shock is in good condition.
  • Shock Feels Too Stiff or Too Soft: If, after setting the sag, the shock still feels too stiff or too soft, it might be time to tweak the compression and rebound settings. The TTX2Air has separate low and high-speed compression adjustments, which allow you to tune the shock for various terrain types.
  • Suspension Bottoming Out: If the shock is bottoming out on rough trails, you may need to add more air pressure to reduce the amount of travel. Conversely, if it feels too harsh, you might need to adjust the rebound to allow quicker return strokes.

Customization and Optimization for Better Performance

To optimize the performance of your TTX2Air shock, consider the following additional adjustments:

  • Rebound Adjustment: The TTX2Air includes a separate rebound damping adjustment. Adjust this to control how fast the shock returns to its original position after compression. A slower rebound can enhance stability on rough terrain, while a faster rebound can improve comfort and control.
  • Compression Settings: Use the low and high-speed compression adjustments to refine the shock’s performance for different terrain. For smoother trails, you may prefer less compression, while rougher terrain often benefits from more compression to reduce bottoming out.
  • Volume Spacers: Consider adding or removing volume spacers from the TTX2Air to fine-tune the shock’s progression. More spacers will increase the shock’s ramp-up at the end of the stroke, preventing bottoming out on aggressive hits.

Comparing TTX2Air with Similar Models

While the Öhlins TTX2Air offers excellent performance for riders looking for precision and adjustability, it’s important to consider how it compares to other rear shock options in the market:

  • Fox Float X2: A direct competitor to the TTX2Air, the Fox Float X2 offers similar adjustability in terms of compression and rebound settings. However, the TTX2Air is often preferred for its smoother, more predictable damping characteristics, particularly on technical and high-speed trails.
  • RockShox Super Deluxe: The RockShox Super Deluxe is another option with adjustable compression and rebound settings. While the TTX2Air is favored for its superior handling and overall precision, the Super Deluxe is often considered a more budget-friendly option for casual riders.

Compatibility with Other Drivetrain Components

The TTX2Air rear shock is designed to work seamlessly with a wide range of mountain bike drivetrain components. However, it’s essential to verify that your shock’s specifications align with your bike frame’s geometry and suspension design. Be sure to check the shock’s stroke length and mounting hardware compatibility with your frame.

In conclusion, setting up rear shock sag for the Öhlins TTX2Air requires careful attention to detail and an understanding of how the shock interacts with your body weight and riding style. With the right adjustments, your TTX2Air shock can provide the performance and control you need to tackle a variety of trails and riding conditions effectively.