DIY Rear Shock Sag Setup for Edge R

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Setting up the rear shock sag on your SR Suntour Edge R [paid link] is a crucial step in ensuring your bike’s suspension system performs optimally. Proper sag setup enhances your riding experience, improving comfort, control, and overall performance. This guide will walk you through the process of setting up the sag on your Edge R [paid link] rear shock, troubleshooting common setup issues, and providing tips for customizing the shock to fit your riding style. We’ll also discuss compatibility with other drivetrain components and compare the Edge R with similar models.

Tools Required

  • Shock pump with gauge
  • Ruler or caliper
  • Marker or tape
  • Bike stand [paid link] or secure mounting setup
  • Allen wrenches [paid link] (for removing the shock if needed)

Setting Up Rear Shock Sag

Setting the correct sag for your SR Suntour Edge R rear shock is essential for achieving optimal performance on various terrains. The sag refers to how much the shock compresses under your body weight when you’re on the bike. Too little sag can result in a harsh ride, while too much sag can make the bike feel unstable.

Step 1: Measure Your Rider Weight

Before setting the sag, you need to know your rider weight. This will determine the appropriate air pressure needed for the rear shock. Weigh yourself with your riding gear on, as this is the weight your shock will need to support during the setup.

Step 2: Adjust the Shock Pressure

Using a shock pump, adjust the air pressure in the Edge R rear shock based on your rider weight. SR Suntour typically provides a recommended pressure range for the Edge R, which can be found in the product manual or online. Start at the lower end of the recommended range if you are unsure.

Step 3: Set the Sag

The ideal sag for the Edge R rear shock typically falls between 25-30% of the shock’s total travel. For example, if your shock has 100mm of travel, your sag should be between 25mm to 30mm. To measure sag:

  • Sit on your bike in your normal riding position, making sure you are balanced and in full riding gear.
  • Use a ruler or caliper to measure the distance between the shock’s eyelet and the shock body. Mark this measurement before getting on the bike.
  • After sitting on the bike, check the measurement again. The difference between the two measurements is your sag. Adjust the air pressure accordingly—if the sag is too little, release air; if the sag is too much, add more air.

Step 4: Fine-Tune the Settings

Once you’ve set the initial sag, ride your bike to feel how it handles. Pay attention to any feeling of bottoming out or being too stiff. If the shock feels too soft or you notice excessive bottoming, increase the air pressure slightly. If the shock feels too firm or doesn’t allow for adequate travel, reduce the air pressure.

Troubleshooting Common Setup Issues

Issue 1: Too Much Sag (Shock Bottoms Out)

If your rear shock sags too much and bottoms out during rides, this indicates that the air pressure is too low. To correct this, add more air to the shock using a shock pump. Start in small increments and test the sag again after each adjustment. Additionally, check for any debris or damage to the shock’s seals that could cause improper performance.

Issue 2: Too Little Sag (Stiff Ride)

If the shock feels too stiff and doesn’t compress enough, you likely have too much air in the shock. Lower the air pressure in small steps until the sag falls within the recommended range. Keep in mind that the Edge R’s performance is highly sensitive to small changes in air pressure.

Issue 3: Inconsistent Performance

Inconsistent performance, such as poor responsiveness or a bouncy ride, may be due to incorrect sag or insufficient rebound adjustment. Check the rebound settings on the Edge R and adjust as necessary. Make sure the shock is clean and free of any dirt or grime, as this can affect its overall performance.

Customization and Optimization for Better Performance

Rebound and Compression Adjustment

To further fine-tune the performance of your Edge R rear shock, you can adjust the rebound and compression settings. These adjustments control how quickly the shock returns to its original position after compressing (rebound) and how much resistance the shock provides during compression (compression). The Edge R features external rebound adjustment, making it easy to dial in the right settings for your riding style.

  • Rebound: Adjust the rebound to suit your preferences. Faster rebound speeds will make the shock return quickly, providing more control during rapid movements. Slower rebound speeds offer better control over rough terrain but may make the ride feel less lively.
  • Compression: Adjust the compression to find the balance between plushness and support. If you’re riding on more aggressive terrain, increasing compression can provide a firmer, more controlled ride. For smoother trails, you may want to reduce compression for a more cushioned ride.

Volume Spacers

Volume spacers are available for the Edge R rear shock and can be used to adjust the shock’s air spring curve. Adding volume spacers can reduce the amount of sag, making the shock more progressive. This is particularly useful for heavier riders or those who ride aggressively on rough terrain.

Shock Lubrication and Maintenance

Regular maintenance of your SR Suntour Edge R rear shock will help keep it performing at its best. Ensure that the shock’s seals are properly lubricated to prevent dirt from entering the internal components. Over time, suspension oils can degrade, so it’s important to service the shock periodically for optimal performance.

Compatibility with Other Drivetrain Components

The SR Suntour Edge R rear shock is designed to be compatible with a wide range of mountain bike frames. It is important to ensure that your bike’s frame can accommodate the shock’s size, travel, and mounting hardware. Always consult the specifications of both your bike frame and the Edge R rear shock to confirm compatibility.

The Edge R is also optimized for use with SR Suntour’s other suspension components, ensuring a seamless integration between your fork and rear shock. When pairing the Edge R with other drivetrain components, make sure the entire system’s geometry and performance characteristics are aligned to avoid any potential issues.

Comparison with Similar Models

The SR Suntour Edge R rear shock stands out for its reliable performance at an affordable price point. However, if you’re considering alternative models, there are a few things to keep in mind.

  • RockShox Monarch RT3 [paid link]: The Monarch RT3 [paid link] offers a similar level of performance to the Edge R but comes with additional adjustment options, such as a lockout feature for climbing. However, the Edge R offers better value for riders on a budget.
  • Fox Float DPS: The Float DPS is a high-end option with exceptional damping performance, but it comes at a higher price. The Edge R offers competitive performance at a fraction of the cost, making it a great choice for casual riders or those looking for budget-friendly performance.

The Edge R offers excellent performance for riders who want a reliable, cost-effective shock that provides all the essential features without unnecessary complexity. If you’re seeking more advanced tuning options, models like the Fox Float DPS might be worth considering.