Setting up the correct rear shock sag on your RockShox Deluxe Coil Ultimate [paid link] is a crucial step in achieving optimal bike performance. Sag is the amount the shock compresses under your body weight when you are sitting on the bike. Getting this setup right ensures that the suspension performs optimally, improving comfort and control, whether you’re climbing or descending. This guide will walk you through the process of setting up your sag for the Deluxe Coil Ultimate [paid link], troubleshooting common issues, and optimizing it for better performance.

Tools Required

• Shock pump (compatible with RockShox Deluxe Coil Ultimate)
• Ruler or sag measurement tool
• A friend or something to lean against (for accurate measurement)
• Allen wrench [paid link] set (for any necessary adjustments to mounting hardware)
• Torque wrench [paid link] (for mounting hardware torque specs)

Understanding the RockShox Deluxe Coil Ultimate

The RockShox Deluxe Coil Ultimate rear shock is known for its smooth performance and durability, especially for riders who prefer coil shocks over air shocks. This shock is equipped with an adjustable rebound damping and a high-quality coil spring. The goal of setting sag properly on this model is to ensure that the shock responds effectively to both small and large bumps while maintaining proper bottom-out control and providing consistent performance during aggressive riding.

Step-by-Step Guide to Setting Sag

1. Prepare Your Bike and Shock

Before starting, ensure that your bike is in the right riding position. Adjust the saddle height and handlebar position to suit your riding style. Make sure the rear shock is mounted securely to the frame and that the coil spring is properly installed.

2. Adjust the Coil Spring (If Necessary)

The RockShox Deluxe Coil Ultimate features a coil spring that can be swapped for a different stiffness if the current spring does not suit your weight or riding style. Typically, the coil spring is labeled with a weight rating, which should align with your body weight. If the spring is too stiff or too soft, it will affect your sag measurement, so ensure the correct spring is installed before proceeding.

3. Set Up the Shock Pump

Attach the shock pump to the air valve on the Deluxe Coil Ultimate rear shock. Make sure the pump is calibrated and ready to adjust the air pressure in the shock. For coil shocks like the Deluxe Coil Ultimate, air pressure is used only for adjusting the negative air chamber if the shock has one. Most sag adjustments are made through coil selection, but air pressure can still have an impact on setup.

4. Get into Riding Position

Once the bike is prepared, get into your riding position. Put on your gear (helmet, pads, etc.), and stand over the bike with your feet off the ground. Have a friend help you hold the bike steady, or lean against a wall to keep the bike upright.

5. Measure the Sag

The correct sag percentage for the Deluxe Coil Ultimate is typically between 25% and 30% of the total shock stroke. To measure the sag, you need to compress the shock by your body weight.

• Stand on the pedals and sit down, compressing the shock under your body weight.
• With a ruler or sag measurement tool, measure the distance the shock compresses from the fully extended position. The distance should correspond to 25%-30% of the total shock stroke.

For example, if your shock has a 50mm stroke, 25% sag would equate to 12.5mm of compression. Adjust the coil spring or air pressure (if applicable) until the sag is within the desired range.

6. Fine-Tune the Rebound Damping

After setting the sag, the next step is to adjust the rebound damping on the Deluxe Coil Ultimate. Rebound damping controls how quickly the shock extends after being compressed. Too little rebound damping can cause the shock to “bounce” back too quickly, while too much can make it sluggish.

Start by adjusting the rebound to a mid-range setting. From there, fine-tune it based on your riding style and terrain. For faster, rougher trails, you might need a bit more rebound damping to prevent the shock from rebounding too quickly.

7. Test Ride and Recheck

Once you have adjusted the sag and rebound, take the bike for a test ride. Pay attention to how the rear shock behaves when you hit bumps, jumps, and during climbs. If the rear end feels too soft, you may need to increase the spring stiffness (a stiffer coil). If it feels too firm, consider reducing the spring stiffness or decreasing the air pressure (if applicable).

After the test ride, check the sag again, as it may settle slightly after the first few rides. Make any final adjustments as necessary to ensure the shock performs optimally under your riding conditions.

Troubleshooting Common Sag Issues

Spring Too Soft or Too Firm

If the shock feels bottomed out on bigger hits or fails to provide sufficient support on climbs, you might need to adjust the coil spring. If you’re using the stock coil and it’s too soft, consider swapping it for a stiffer spring. Conversely, if the spring is too stiff, a softer coil might provide better performance.

Excessive Rebound or Slow Rebound

Rebound damping can sometimes be tricky to set up. If the shock rebounds too quickly or “bounces” back, try increasing the rebound damping. If the shock feels sluggish and doesn’t return fast enough after compression, reduce the rebound damping slightly.

Optimizing the Deluxe Coil Ultimate for Better Performance

Customize the Rebound Damping

Fine-tuning the rebound damping based on terrain type is essential. On smoother trails, less rebound damping may be needed, while aggressive, rougher trails benefit from more rebound damping to keep the rear wheel in contact with the ground.

Experiment with Compression Settings

While the Deluxe Coil Ultimate doesn’t have external compression adjustment, you can still experiment with different spring rates to affect how the shock compresses. A stiffer coil will limit the shock’s overall compression, while a softer coil allows more compression. Adjusting your spring choice based on riding style and terrain will help optimize the shock’s performance.

Compatibility with Other Drivetrain Components

The RockShox Deluxe Coil Ultimate is compatible with most modern mountain bike frames, though compatibility with other drivetrain components depends on the frame’s design. Ensure that your bike frame is compatible with a coil shock and that the shock’s stroke length and mounting hardware match the specifications of your bike. Double-check the rear axle and linkage clearance to avoid interference with the shock.

Conclusion

Setting the rear shock sag on your RockShox Deluxe Coil Ultimate ensures that your suspension is dialed in for optimal performance. Proper sag setup allows the shock to absorb bumps effectively, provide better traction, and enhance comfort during your rides. By following the steps outlined above, adjusting the spring stiffness, and fine-tuning the rebound damping, you can maximize your suspension’s performance. With the right setup, your Deluxe Coil Ultimate will deliver an enhanced riding experience across various terrains.