Setting up the sag on your Vivid Ultimate [paid link] rear shock is a crucial part of ensuring your bike’s suspension performs optimally. Proper sag settings allow the shock to work efficiently by maintaining an appropriate balance between comfort and control. This guide will walk you through the process of adjusting your rear shock sag for the RockShox Vivid Ultimate [paid link] model, providing you with the tools, steps, and key considerations for a perfect setup.
Tools Required
- Shock pump with a pressure gauge
- Tape measure or ruler
- Marker or tape for measuring sag
- A friend (optional, but helpful)
- Torque wrench [paid link] (optional)
Understanding Rear Shock Sag
Sag refers to how much the rear shock compresses under the rider’s weight when they are sitting on the bike in riding position. The right amount of sag ensures that the shock is neither too stiff nor too soft, providing the ideal balance of comfort and control on different terrains. For the Vivid Ultimate shock, the recommended sag range is typically between 25% and 30% of the shock’s total travel. However, personal preferences and riding style may lead you to adjust it slightly within this range.
Step 1: Prepare Your Bike
Before you begin setting up your rear shock sag, make sure your bike is properly prepared. The rear shock should be mounted securely on the bike, with all bolts tightened to the recommended torque specifications. Additionally, make sure the bike is on a level surface to ensure accurate measurements.
Step 2: Check Your Rider Weight
The amount of sag required will depend largely on your weight and the type of riding you plan to do. Heavier riders generally need a bit more air pressure in their shocks to achieve the correct sag. Use the manufacturer’s suggested air pressure settings as a starting point, but expect to adjust based on your specific needs.
Step 3: Set the Shock Pressure
Using a shock pump, set the initial air pressure in the Vivid Ultimate rear shock. Start with the manufacturer-recommended baseline air pressure, which can be found in the shock’s user manual. As you begin adjusting the sag, you may need to fine-tune the pressure.
Step 4: Measure the Sag
- Mark your current position: With the shock pressure set, use a marker or a piece of tape to make a reference mark on the shock’s stanchion. This will be your “uncompressed” position.
- Get on the bike: In your normal riding gear (including backpack if applicable), sit on the bike and assume your riding position. You may want a friend to help you balance the bike, or you can lean against a wall for support.
- Measure the sag: After sitting on the bike, use a tape measure or ruler to measure the distance between the reference mark on the stanchion and the top of the shock body. This distance represents the amount of sag, or how much the shock has compressed under your weight.
Step 5: Adjust the Air Pressure
- If the sag is too high (i.e., the shock compresses more than desired), increase the air pressure slightly by adding small increments. Repeat the process of measuring the sag until you reach the desired amount.
- If the sag is too low (i.e., the shock doesn’t compress enough), reduce the air pressure by releasing small amounts of air. Measure again to confirm you’re within the ideal range.
For the Vivid Ultimate, the recommended sag range is typically 25% to 30% of the shock’s total travel, but you can adjust slightly based on your comfort and performance preferences.
Step 6: Test Ride and Fine-Tune
Once you’ve adjusted the sag to your satisfaction, take the bike for a test ride. Pay attention to how the rear shock feels during various types of terrain—smooth sections, rough climbs, and technical descents. If you feel like the shock is too soft or too stiff, you can make minor adjustments by adding or releasing air until the ride feels just right.
Troubleshooting Common Set-Up Issues
Issue 1: Shock Feeling Too Soft or Too Stiff
- Too soft: If the shock feels too soft, you may have too much sag, causing excessive compression on rough terrain. Add air pressure to reduce the sag and stiffen the shock.
- Too stiff: If the shock feels too stiff and doesn’t absorb impacts well, you may have too little sag. Decrease the air pressure to allow for more shock compression.
Issue 2: Inconsistent Performance Over Different Terrains
If you notice inconsistent performance on different terrain types, it could be that the sag is not balanced for the conditions. For example, if you often ride on aggressive terrain, you may want slightly less sag (around 25%) to avoid bottoming out. For smoother rides, more sag (around 30%) may provide more comfort.
Issue 3: Air Pressure Adjustment Difficulties
If you’re having trouble adjusting the air pressure, make sure you’re using a shock pump that fits the Vivid Ultimate’s valve properly. If the pump’s gauge is faulty, it may result in inaccurate readings. Always double-check the pressure using a separate gauge if needed.
Customization and Optimization
Once your sag is dialed in, consider further customization options to optimize your Vivid Ultimate rear shock’s performance. Here are a few areas to focus on:
Adjusting Rebound Damping
Rebound damping controls how quickly the shock returns to its uncompressed position after compressing. Too fast a rebound can cause instability, while too slow a rebound can result in a sluggish feel. For the Vivid Ultimate, adjust the rebound settings based on your preferred riding style and terrain.
Fine-Tuning Compression Damping
Compression damping determines how much resistance the shock provides when compressing. For aggressive riding or downhill trails, you may want higher compression damping to prevent bottoming out. On smoother rides, lower compression damping can increase comfort and efficiency.
Upgrading the Shock’s Internal Components
If you’re looking to optimize performance further, consider upgrading the internal components of your Vivid Ultimate shock. Options like different air canisters, upgraded dampers, or even a custom tuning can offer better performance for specific riding needs.
Comparison with Similar Models
While the Vivid Ultimate offers excellent performance for most mountain bikers, it’s important to compare it with similar models in the RockShox range, such as the Super Deluxe or the Monarch Plus.
- Vivid Ultimate vs. Super Deluxe: The Vivid Ultimate is designed for aggressive riders who require maximum performance on technical terrain, while the Super Deluxe offers a slightly more refined and versatile [paid link] ride suitable for both cross-country and trail riders.
- Vivid Ultimate vs. Monarch Plus: The Monarch Plus is more focused on riders who prioritize comfort and efficient pedaling, making it a great choice for all-day trail rides. However, the Vivid Ultimate offers superior performance for downhill and enduro riding, with better shock control.
Compatibility with Other Drivetrain Components
When setting up your rear shock, it’s important to ensure compatibility with your bike’s other drivetrain components. For instance, ensure that your shock’s travel is appropriate for the frame and suspension design. Some frames may be optimized for shorter or longer shocks, and using an incompatible shock can affect the bike’s overall geometry and handling. Additionally, make sure that your suspension setup works well with your drivetrain and brake components to maintain overall bike balance.