The Öhlins TTXAir 2.1 is a high-performance rear shock designed to provide exceptional control, comfort, and durability for your road bike. Proper sag setup is crucial for achieving optimal suspension performance, ensuring that you get the best ride quality, handling, and efficiency. This guide will take you step-by-step through the process of setting up the sag on your TTXAir 2.1.
Understanding Sag and Its Importance
Sag refers to the amount the suspension compresses under the rider’s weight. The correct amount of sag ensures that the suspension works within its optimal range, allowing for smooth travel, responsive handling, and efficient energy transfer. Too little sag can make the bike feel harsh, while too much sag can result in sluggish handling and wasted energy. The TTXAir 2.1 rear shock is designed to provide excellent performance across a range of rider weights and riding styles, but achieving the correct sag is essential for getting the best out of this sophisticated shock.
Tools Required
- Suspension pump (compatible with Öhlins TTXAir 2.1)
- Measuring tape or ruler
- Marker or tape for reference points
- Torque wrench [paid link] (for securing components)
Step 1: Set Up the Bike
Before adjusting the sag, ensure that your bike is in a stable position. Set the bike on a flat surface and make sure the rear wheel is securely on the ground. If possible, have a helper hold the bike in place or use a bike stand [paid link] to keep it steady during the setup process.
Step 2: Adjust Air Pressure
The first step in setting up the sag is to adjust the air pressure in the TTXAir 2.1 shock. This pressure directly influences how much the shock compresses under the rider’s weight. To begin:
- Check the recommended air pressure: Consult the Öhlins manual for the TTXAir 2.1 to find the manufacturer’s recommended air pressure based on your rider weight.
- Use the suspension pump: Attach the suspension pump to the valve on the TTXAir 2.1 and adjust the pressure to match the recommended value. If you are unsure, start with a baseline and make adjustments as needed after testing the sag.
Step 3: Set Your Sag Measurement
To properly set your sag, you need to measure how much the shock compresses under your weight. This requires marking the shock’s stanchion or shaft to easily track the compression. Follow these steps:
- Use a measuring tape or ruler: Measure the distance between a fixed point (like the shock’s upper body) and the shock’s stanchion or shaft when the bike is unweighted.
- Mark the shock shaft: Using a marker or tape, mark the shock’s shaft at the point where it meets the shock body when the bike is in its unloaded position.
Step 4: Apply Rider Weight
Now that the shock is properly inflated, it’s time to apply your weight to simulate normal riding conditions:
- Mount the bike: Put on your riding gear (including a backpack if you normally ride with one) and mount the bike.
- Assume riding position: Stand up on the pedals, keeping your weight centered over the bike. This mimics the stance you would have during typical riding, ensuring an accurate sag measurement.
Step 5: Measure Sag
With your weight on the bike, check how far the shock compresses. The goal is to achieve the correct amount of sag, which is typically around 30% of the shock’s total travel. For example, if your TTXAir 2.1 shock offers 50mm of total travel, your sag should be around 15mm.
- Check the compression: Measure the distance between the fixed point and your mark on the shock shaft. This will show how much the shock has compressed under your weight.
- Adjust sag: If the sag is too much (over 30% of the shock’s travel), add air pressure to the shock. If the sag is too little (less than 30%), reduce the air pressure.
Step 6: Fine-Tune the Sag
After your initial setup, it’s important to fine-tune the sag:
- Test the setup: Go for a short ride and pay attention to how the bike feels. If it feels too stiff or too soft, adjust the air pressure incrementally and recheck the sag.
- Repeat if necessary: It’s normal to make small adjustments to the air pressure after a test ride to fine-tune the performance.
Step 7: Final Check
Once you’ve dialed in the sag, double-check the air pressure and ensure all components are securely fastened. Use a torque wrench [paid link] to tighten the shock bolts according to the manufacturer’s specifications. Double-check the sag measurement to ensure consistency with your desired setup.
Troubleshooting Common Sag Issues
If you’re experiencing issues with sag, consider the following:
- Sag too soft: This may indicate too low an air pressure in the shock. Increase the air pressure incrementally until you achieve the correct sag.
- Sag too firm: If the bike feels harsh or bouncy, your air pressure may be too high. Reduce the pressure slightly and recheck the sag.
- Uneven sag: If the shock compresses unevenly (e.g., one side of the shock is more compressed than the other), check for dirt or debris on the shock, which could impede smooth movement. Clean the shock thoroughly and recheck the sag.
Customization and Optimization for Better Performance
Once you’ve set your sag correctly, you can optimize the TTXAir 2.1 rear shock for even better performance:
- Adjust the rebound damping: The rebound damping controls how quickly the shock returns after compressing. If your shock feels too bouncy, increase the rebound damping to slow down the return. If the bike feels too harsh, reduce the rebound damping.
- Set up compression damping: Compression damping controls how much the shock resists compression. Experiment with different settings to find the balance that suits your riding style.
Conclusion
Setting up the sag on your Öhlins TTXAir 2.1 rear shock is essential for achieving a smooth, responsive ride. By following the steps outlined in this guide, you can ensure that your bike’s suspension is perfectly tuned to your weight and riding style, giving you optimal performance on every ride. Regularly check and maintain the sag to keep your bike in peak condition.