DIY Rear Shock Sag Setup for Storia V3 Trunnion

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The Storia V3 Trunnion [paid link] rear shock by EXT is a high-performance shock designed for riders seeking precision, customization, and exceptional performance on challenging terrain. Setting up the correct sag is a crucial step in ensuring that the shock functions optimally for your riding style and the terrain you tackle. In this guide, we will take you through the process of performing a DIY rear shock sag setup for your Storia V3 Trunnion [paid link], providing detailed steps, troubleshooting tips, and adjustments to help you achieve the best setup possible.

Tools Required

To perform the rear shock sag setup for the Storia V3 [paid link] Trunnion, you will need the following tools:

  • A shock pump (compatible with Schrader valve)
  • A tape measure or caliper
  • A bike stand [paid link] or suspension jack
  • A ruler or sag meter (optional)
  • A marker or tape (for reference points)
  • A level (to ensure the bike is properly aligned)

Understanding Rear Shock Sag

Sag refers to the amount the shock compresses under the rider’s weight when the bike is in use. It plays a significant role in how the suspension responds to bumps and impacts, affecting overall performance and comfort. For the Storia V3 [paid link] Trunnion, setting the correct sag ensures optimal traction, comfort, and control, whether you are tackling aggressive downhill runs or climbing technical ascents.

Why Sag Matters

The correct sag ensures that the shock is neither too soft nor too firm, which would result in poor control or inadequate absorption of shocks. Too little sag can lead to a harsh ride, while too much sag can cause the shock to bottom out too easily. By properly setting sag, you achieve a balance that maximizes performance and rider comfort.

Step-by-Step Guide to Setting Up Sag

Step 1: Check Your Rider Weight and Desired Sag Percentage

Before adjusting your rear shock, it’s essential to determine your body weight and select the appropriate sag percentage. The Storia V3 Trunnion typically requires 25-30% of sag for optimal performance, depending on your riding style and terrain. Heavier riders may opt for a slightly higher percentage within this range, while lighter riders may adjust towards the lower end.

  • 25% sag: Ideal for aggressive riders who prioritize stiffness and control on rougher trails.
  • 30% sag: Better suited for riders who prefer a plush ride with improved comfort and traction.

Step 2: Set the Bike in a Neutral Position

Place the bike on a bike stand [paid link] or suspension jack, ensuring it is level. This will allow for an accurate measurement of the sag without any interference from the ground or other surfaces. If you do not have a bike stand, a wall or similar structure will suffice, as long as the bike remains upright and level.

Step 3: Measure the Shock’s Eye-to-Eye Length (Uncompressed)

Before you start adjusting the sag, it’s essential to know the shock’s uncompressed eye-to-eye length. This is the maximum extended position of the shock without any rider load. Use a tape measure or caliper to record this measurement. You will refer to this measurement when checking the amount of sag later.

Step 4: Add Air Pressure to the Shock

Using your shock pump, gradually add air to the Storia V3 Trunnion shock. Begin by referring to the manufacturer’s recommendations based on your weight. You may want to add a little extra pressure to account for sag adjustments.

  • Start with the baseline pressure: This typically aligns with your body weight and sag percentage.
  • Check for air leaks: Ensure that the shock pump is securely attached and no air is leaking during inflation.

Step 5: Mark the Shock’s Stroke

To measure sag accurately, mark the shock’s stroke with a small piece of tape or a marker. This will act as a reference point. The mark should be placed near the middle of the shock’s stroke, giving you a clear visual of how much compression occurs when you sit on the bike.

Step 6: Mount the Bike and Assume Riding Position

Now, mount the bike and assume your normal riding position. Be sure to wear all your gear, including your helmet and any backpack or other equipment you typically carry. This ensures an accurate reading of your actual riding weight and sag.

  • Make sure the bike is level: Ensure the bike remains balanced during the measurement process.
  • Use a suspension buddy: If possible, ask a friend to help by keeping the bike steady while you take measurements.

Step 7: Measure the Sag

Once in the riding position, measure how much the shock compresses from the fully extended position (uncompressed eye-to-eye length) to the position marked by the tape. This is the amount of sag your shock has.

  • Sag = Compressed Length / Uncompressed Length × 100
  • For example, if the shock compresses by 30mm on a shock with an uncompressed length of 120mm, the sag is (30mm / 120mm) × 100 = 25%.

Step 8: Adjust the Air Pressure

If the sag is outside the recommended 25-30% range, use the shock pump to adjust the air pressure accordingly.

  • If the sag is too high: Add more air to the shock.
  • If the sag is too low: Release some air from the shock.

After each adjustment, repeat the measurement process to ensure the sag falls within the desired range. It may take several adjustments to get it just right.

Step 9: Final Check and Test Ride

Once you have the desired sag setting, perform a final check to ensure the shock behaves as expected. Take the bike for a short test ride on your usual trails to verify comfort, handling, and performance. Pay attention to how the shock reacts to various terrain types, ensuring it provides adequate support without bottoming out or feeling too stiff.

Troubleshooting Common Sag Setup Issues

Shock Bottoming Out Too Easily

  • Cause: Too little air pressure or too soft of a spring rate.
  • Solution: Increase the air pressure slightly to prevent the shock from bottoming out on impacts.

Harsh Ride or Lack of Comfort

  • Cause: Too much air pressure or insufficient sag.
  • Solution: Decrease the air pressure to increase sag and improve comfort and traction.

Inconsistent Performance

  • Cause: Air pressure set incorrectly or inconsistent compression adjustments.
  • Solution: Recheck the air pressure and ensure both rebound and compression settings are fine-tuned for your weight and riding style.

Optimizing Performance with Custom Adjustments

The Storia V3 Trunnion allows for extensive customization of rebound and compression settings, offering riders the ability to fine-tune their suspension performance based on terrain and riding style. After setting sag, experiment with different rebound and compression adjustments to optimize your ride.

  • Rebound: Adjust for how quickly the shock returns after compression. A slower rebound helps smooth out aggressive hits, while a faster rebound provides more control on smoother trails.
  • Compression: Customize the low-speed and high-speed compression to dial in your desired ride feel. For example, softer compression works well for aggressive downhill riding, while firmer settings improve pedaling efficiency on climbs.

Comparison with Similar Models

When comparing the Storia V3 Trunnion to other similar rear shocks, it stands out for its advanced tuning capabilities, high-quality materials, and consistent performance across a wide range of riding conditions. Its trunnion mount system allows for a more stable and efficient connection to the frame, providing riders with better handling, especially on rough terrain.

While shocks like the Fox Float X2 or RockShox Super Deluxe may offer similar performance, the Storia V3 Trunnion excels in its tuning precision and ability to cater to custom setups for different riders. Its high adjustability, combined with its unique damping system, sets it apart for riders who want a tailored suspension experience.

Compatibility with Other Drivetrain Components

The Storia V3 Trunnion is designed to be compatible with most modern drivetrain components. However, when choosing the right shock for your bike, consider the overall geometry and frame design to ensure proper fit and function. The trunnion mount system, in particular, requires specific frame mounts, so double-check your bike’s compatibility before purchasing or installing this shock.

Overall, the Storia V3 Trunnion offers a versatile [paid link] and high-performance solution for riders looking to optimize their bike’s suspension setup. By following the steps outlined in this guide, you can ensure your shock is tuned for optimal sag, comfort, and performance, allowing you to enjoy a smoother, more controlled ride on any terrain.