DIY Rear Shock Sag Setup for Float SL Factory

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Setting up your rear shock sag correctly is crucial for optimal performance, comfort, and control on your bike. The Fox Float SL Factory shock is a lightweight, high-performance model that offers excellent adjustability to meet the needs of riders across various disciplines. In this guide, we’ll walk through the process of setting up sag for the Float SL Factory rear shock, covering everything from installation to fine-tuning for optimal performance.

Tools Required

  • Shock pump with gauge
  • Measuring tape or ruler
  • Marker or tape for reference
  • Level ground (or a bike stand [paid link] for stability)
  • Helper (optional but recommended)

Installation of the Float SL Factory Rear Shock

Before adjusting sag, it is essential to install the Float SL Factory rear shock correctly. The shock must be installed securely to ensure proper function during the setup process.

  1. Position the Bike: Place your bike on level ground or a stable bike stand [paid link].
  2. Install the Rear Shock: Use the appropriate mounting hardware and install the shock into the rear triangle. Ensure the shock is seated properly and tighten the bolts to the manufacturer’s specifications.
  3. Check for Proper Clearance: Confirm there is no interference between the shock and the frame, especially in areas with suspension travel.

Understanding Rear Shock Sag

Sag is the amount the rear shock compresses under the rider’s weight when the bike is in use. It’s critical for achieving a comfortable and responsive ride, as improper sag can lead to poor handling or reduced shock performance. The recommended sag for the Fox Float SL Factory rear shock is typically between 25-30% of total shock travel. For example, with a 100mm travel shock, the sag should fall between 25mm and 30mm.

Adjusting Sag for the Float SL Factory Rear Shock

Step 1: Set the Air Pressure

To begin the sag setup, you’ll need to adjust the air pressure in the Float SL Factory shock. The correct air pressure varies depending on the rider’s weight and riding style. Fox provides a recommended air pressure chart based on rider weight, but the ideal pressure can vary slightly due to personal preferences and terrain.

  1. Determine Rider Weight: Use the rider’s body weight to estimate the starting air pressure. Fox’s chart will offer a base starting point.
  2. Use a Shock Pump: Attach the shock pump to the air valve of the shock and inflate it to the desired pressure. Always check the pump gauge to ensure the correct PSI.
  3. Check the Air Pressure Regularly: It’s important to check air pressure regularly, as it can fluctuate due to temperature changes and usage.

Step 2: Set Up the Bike

To measure sag properly, the rider must be in the correct position on the bike. This will ensure the shock is set up accurately for their weight and riding style.

  1. Position the Bike on Level Ground: Ensure the bike is stable and positioned on level ground to avoid inaccurate readings.
  2. Wear Your Full Riding Gear: The rider should wear all their riding gear, including a hydration pack or any other equipment that might affect their weight. This ensures the most accurate setup for real-world conditions.

Step 3: Measure the Sag

  1. Measure the Shock Stroke: First, measure the total stroke length of the Float SL Factory shock (e.g., 100mm of travel). Use a ruler or measuring tape to find the shock’s maximum extension.
  2. Mark the Shock Shaft: Use a marker or tape to mark the shaft of the shock at the maximum extension point.
  3. Check Rider Position: Have the rider mount the bike and assume their typical riding position, keeping the bike stable.
  4. Check the Compression: Once in position, the rider should compress the shock by sitting on the saddle. The shock will compress based on the rider’s weight.
  5. Measure the Sag: After the rider settles into position, check the distance between the original marker and the new position of the shock shaft. The difference in millimeters represents the sag.
  6. Adjust the Air Pressure: If the sag is too high (too little compression), reduce the air pressure. If the sag is too low (too much compression), increase the air pressure.

Step 4: Fine-Tune the Sag

After the initial setup, make slight adjustments to the air pressure until the sag falls within the recommended range (25-30% of the shock’s total travel). This will provide the best balance between comfort and control while riding.

  1. Test Ride and Adjust: Once you have set the initial sag, it’s a good idea to take the bike for a short test ride. During the ride, pay attention to how the shock feels over various terrains. If the ride feels too harsh or too soft, adjust the air pressure accordingly.
  2. Make Small Adjustments: Small adjustments to air pressure can significantly affect the overall feel of the shock. Fine-tuning this to your preference is key to getting the most out of the Float SL Factory.

Troubleshooting Common Setup Issues

While setting up the sag on the Float SL Factory rear shock, there are a few common issues that riders may encounter.

Too Little Sag (Shock Not Compressing Enough)

  • Possible Cause: If the sag is too small, it may indicate that the air pressure is too high.
  • Solution: Lower the air pressure to achieve a higher compression. This will allow for better shock absorption during impacts.

Too Much Sag (Shock Compressing Too Much)

  • Possible Cause: Excessive sag can occur if the air pressure is too low.
  • Solution: Increase the air pressure to ensure the shock has proper support and doesn’t bottom out during use.

Inconsistent Sag Readings

  • Possible Cause: Inconsistent sag readings can occur if the rider is not in the correct position or the bike is not on level ground.
  • Solution: Ensure the rider is in their typical riding position, and the bike is stable on level ground.

Customization and Optimization

To get the best performance from the Float SL Factory rear shock, consider fine-tuning additional settings such as rebound and compression damping.

Adjusting Rebound

Rebound adjustment controls the speed at which the shock returns after compression. If the rebound is too fast, the bike may bounce excessively. If it’s too slow, the bike may feel sluggish and unresponsive.

  1. Turn the Rebound Damping Knob: Turn the rebound knob clockwise to slow down the return or counterclockwise to speed it up.
  2. Test and Fine-Tune: After making adjustments, test the bike to find a rebound setting that feels smooth and controlled.

Adjusting Compression

Compression damping affects how the shock reacts to forces that compress it. Fine-tuning compression helps maintain control during rough terrain or aggressive riding.

  1. Adjust the Compression Damping Knob: Turn the knob to increase or decrease compression. The higher the compression, the stiffer the shock will feel.
  2. Test and Fine-Tune: Make small adjustments during test rides to find a compression setting that works well for the rider’s style and terrain.

Compatibility with Other Drivetrain Components

The Fox Float SL Factory rear shock is designed to be compatible with a wide range of mountain bike frames and drivetrains. However, it’s always essential to check compatibility, especially when upgrading components. Ensure that the shock is the correct size for the frame and that the shock’s mounting hardware matches the frame’s specifications.

Conclusion

Properly setting up sag on your Fox Float SL Factory rear shock is an essential step in optimizing the performance of your bike. With the correct air pressure, careful measurements, and fine-tuning of settings like rebound and compression, you can enhance your bike’s comfort, responsiveness, and control. By following these steps and troubleshooting common issues, you’ll be able to enjoy a smoother ride and better performance on any trail.