DIY Rear Shock Sag Setup for Monarch Plus RC3

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The Monarch Plus RC3 by RockShox is a high-performance rear shock designed for enduro and trail riding. Proper sag setup is essential to get the most out of your suspension. Sag refers to the amount the shock compresses under your body weight when you’re on the bike. Setting it correctly ensures optimal performance, comfort, and control. This guide walks you through the steps to achieve the correct rear shock sag setup for the Monarch Plus RC3.

Tools Required

  • Shock pump (compatible with RockShox air shocks)
  • Tape measure or ruler
  • Marker or masking tape
  • Flat surface (like a workbench or driveway)
  • Your bike
  • Helper (optional but recommended)

Understanding Sag and Its Importance

Sag is a critical factor in suspension setup, as it determines how much of your shock’s travel is used when riding. If your shock has too little sag, it will feel harsh and stiff, reducing traction and control. Conversely, too much sag can lead to bottoming out too easily, causing poor performance and a less responsive feel on the trail.

For the Monarch Plus RC3, achieving the right sag will ensure your bike handles rough terrain effectively while maintaining comfort.

Optimal Sag Range for the Monarch Plus RC3

The recommended sag for the Monarch Plus RC3 typically falls between 25% and 30% of the shock’s total travel. This means if your shock has 160mm of travel, you should aim for 40mm to 48mm of sag. The specific setting within this range will depend on your riding style, weight, and the terrain you tackle.

Step-by-Step Setup for Rear Shock Sag

Step 1: Prepare Your Bike

  • Position your bike on a flat, stable surface.
  • Ensure that the rear wheel is off the ground so that the shock can move freely.
  • If possible, have a helper hold the bike while you set it up, or use a bike stand [paid link] to stabilize it.

Step 2: Measure Your Current Sag

  1. Set your air pressure: Begin by adjusting the air pressure in the Monarch Plus RC3 to the manufacturer’s recommended setting based on your rider weight. This can be found on the shock body near the air valve.
  2. Mark your starting position: With the shock pumped to the recommended pressure, use a piece of masking tape or a marker to mark the shock’s shaft where it meets the body when there is no load (bike is stationary).
  3. Get on the bike: Put on your full gear, including any pack or water bottle, and hop onto the bike. Make sure to assume your riding position with both feet on the pedals and the handlebars in their normal riding position.
  4. Check the sag: With your weight on the bike, the shock will compress, so you will need to measure how much the shock shaft has moved. Measure from the original mark (when no load was on the bike) to the new mark where the shaft now sits.
  5. Determine the sag: Calculate the percentage of travel used by the shock by dividing the amount the shock shaft has compressed by the total travel of the shock, then multiply by 100. For example, if your shock has 160mm of travel and the shaft has moved 40mm, your sag is 25% (40mm ÷ 160mm x 100).

Step 3: Adjust the Air Pressure

  • If the sag is too high (more than 30%), increase the air pressure in the shock by a few PSI and test again.
  • If the sag is too low (less than 25%), reduce the air pressure by a few PSI and test again.

Repeat this process until you are within the recommended sag range.

Step 4: Fine-tune the Shock Settings

Once you’ve achieved the correct sag, it’s time to fine-tune other settings to optimize the shock’s performance:

  • Rebound: Adjust the rebound dial to control how quickly the shock returns after compression. For a smoother ride, set the rebound so that the shock returns slowly but doesn’t cause you to bounce.
  • Compression: The Monarch Plus RC3 features a three-position compression adjuster: Open, Pedal, and Lock. You can use these to fine-tune the shock’s responsiveness to different trail conditions.
    • Open: Provides maximum travel and is best for rough terrain.
    • Pedal: Offers more resistance to prevent excessive bobbing during pedaling.
    • Lock: Completely locks the shock for climbing or smooth trails.

Adjust these settings to suit your riding preferences.

Step 5: Test Ride and Reassess

After completing the setup, take your bike for a test ride. Pay attention to how the shock performs on rough terrain and during climbs. If the shock feels too soft or too stiff, return to the shop and make minor adjustments to the air pressure and compression settings.

Troubleshooting Common Sag Issues

Sag Too High (Shock Bottoms Out)

  • Cause: Insufficient air pressure.
  • Solution: Increase the air pressure in the shock by small increments and test again.

Sag Too Low (Harsh Ride)

  • Cause: Excessive air pressure.
  • Solution: Decrease the air pressure to achieve more sag.

Lack of Adjustability

  • Cause: Incorrect compression and rebound settings.
  • Solution: Adjust the rebound and compression settings as per your needs for more control and comfort.

Customization and Optimization for Better Performance

Customizing the Monarch Plus RC3 can improve performance on specific terrain types:

  • For Enduro Riders: Focus on a lower air pressure to maximize shock absorption. Use the Open compression setting for downhill sections.
  • For Cross-Country Riders: Set higher air pressure for a firmer feel, and use the Pedal setting to minimize pedal bob.
  • For Heavy Riders: If you are on the heavier side, start at the higher end of the recommended air pressure range and adjust based on ride feedback.

These adjustments help tailor the shock to the rider’s style, weight, and trail conditions.

Comparison with Similar Models

The Monarch Plus RC3 competes with other premium air shocks in the market, such as the Fox Float X2 and DVO Jade X. Each of these shocks has its own set of features:

  • Fox Float X2: Known for its smoothness and responsiveness but at a higher price point.
  • DVO Jade X: Offers a coil-spring setup, providing more consistent performance but less adjustable than air shocks.

The Monarch Plus RC3 is often chosen for its adjustable compression settings and good value for performance, making it an excellent choice for riders who want versatility without breaking the bank.

Compatibility with Other Drivetrain Components

The Monarch Plus RC3 is compatible with a wide range of drivetrain setups, from 1x to 2x systems. When selecting a shock, ensure that the mount type matches your bike’s frame (e.g., metric or traditional eyelet) and that the shock’s travel is suitable for your bike’s geometry.

It’s essential to pair the shock with a compatible fork and ensure the overall suspension balance matches the rider’s weight and riding style. For example, pairing the Monarch Plus RC3 with a RockShox fork can optimize suspension performance across both ends of the bike.

By following this guide, you can ensure that your Monarch Plus RC3 is set up correctly for maximum performance, comfort, and durability.