The Kage RC rear shock from RockShox is a robust and reliable component designed for mountain biking enthusiasts. Over time, the internal oil in the shock can break down or get contaminated, which negatively impacts the shock’s performance. Performing a rear shock oil change on the Kage RC is an essential part of maintaining its performance, responsiveness, and longevity. This guide will walk you through the installation, maintenance, and troubleshooting steps to ensure your shock is functioning at its best.
Tools Required
- RockShox Rear Shock Rebuild Kit
- 10mm and 8mm socket wrenches
- Torque wrench [paid link]
- Oil seal driver
- Suspension fluid (RockShox recommended)
- Shock oil (RockShox 15wt or equivalent)
- Shock pump
- Clean rags or paper towels
- Isopropyl alcohol for cleaning
- Small container for drained oil
- Safety gloves
Disassembling the Kage RC Shock
Before beginning the oil change, ensure that your bike is properly secured in a work stand. This will make the entire process more comfortable and reduce the risk of accidents.
1. Remove the Shock from the Bike
To remove the shock from your bike, first, relieve the air pressure by using a shock pump. Be sure to completely deflate the shock before unbolting it from the frame. Use the appropriate wrench sizes (usually 8mm or 10mm) to remove the bolts securing the shock to the bike’s frame and rear triangle. Carefully remove the shock and set it aside on a clean surface.
2. Remove the External Canister
The Kage RC shock has an external canister, which houses the oil. Begin by removing the outer body of the shock. Use a 10mm socket wrench to undo the bolts securing the canister to the shock body. Carefully separate the canister from the shock’s main body, taking note of the O-rings and seals for later reinstallation.
3. Drain Old Oil
Once the canister is removed, place the shock upside down over a clean container to allow the old oil to drain completely. This is a crucial step to ensure that any old, degraded oil is entirely removed before adding fresh fluid.
4. Clean All Parts
After draining the old oil, take time to clean all components using isopropyl alcohol and a clean rag. This includes the canister, shock body, and any seals or O-rings. This step helps to avoid contamination from old dirt or oil when assembling the shock again.
Replacing the Oil in the Kage RC
1. Install New Seals and O-Rings
Before reassembling the shock, inspect the seals and O-rings for wear or damage. If any of these parts are damaged, replace them using a RockShox rebuild kit. This is essential to ensure that the shock maintains proper compression and rebound functions.
2. Add the New Oil
Once the shock is clean and all parts are inspected, it’s time to add the new oil. Place the shock in an upright position and carefully fill the reservoir with the recommended suspension fluid. For the Kage RC, RockShox recommends using their 15wt oil or an equivalent oil. Be sure to fill the shock to the correct level as specified by the manufacturer. Avoid overfilling, as this could lead to improper shock performance.
3. Reassemble the Shock
With the shock now filled with oil, carefully reassemble the external canister onto the shock body. Ensure that the seals and O-rings are properly seated, and tighten the bolts securely with a torque wrench [paid link]. It’s crucial that all bolts are tightened to the manufacturer’s specifications to prevent any leakage or damage to the shock.
4. Perform a Compression Test
After reassembling the shock, perform a quick compression test by pressing down on the shock’s body and slowly releasing it. This will allow you to check if the shock is functioning smoothly. If the compression is too soft or too stiff, you may need to adjust the oil volume or swap the oil weight based on the rider’s preferences.
Installing the Kage RC Shock Back onto the Bike
1. Reattach the Shock to the Frame
Place the shock back into the bike frame and secure it with the bolts that were removed earlier. Ensure that all bolts are properly torqued to the correct specifications. Double-check the alignment to avoid damaging the shock or frame.
2. Reinflate the Shock
Once the shock is installed back onto the bike, use a shock pump to inflate the shock to the recommended pressure. The ideal pressure depends on the rider’s weight and the shock’s intended use, so consult the manufacturer’s guidelines for the correct pressure setting.
3. Test the Shock’s Performance
Before taking the bike out on the trail, check the shock’s performance by pressing down on the bike’s saddle or rear triangle to test for proper function. Make sure that there is no excessive sag or bottoming out. Perform a final visual inspection to ensure everything is correctly installed and secure.
Troubleshooting Common Issues After Oil Change
1. Shock Not Compressing Smoothly
If the shock doesn’t compress or rebound smoothly after an oil change, check for the following:
- Ensure that the shock oil is the correct type and has been filled to the correct level.
- Verify that the seals are properly installed, and that the O-rings are intact.
- Check if there is any air trapped inside the shock or reservoir, as this can affect performance. If necessary, bleed the shock to remove any air.
2. Oil Leaks
If oil is leaking from the shock after reassembly, inspect all seals and O-rings for damage. If you find any damaged components, replace them immediately. Ensure that all bolts are properly tightened to prevent leakage from the canister or shock body.
3. Inconsistent Rebound
If the rebound is inconsistent or too fast/slow, it may indicate that the oil level is incorrect or that the damper assembly needs further attention. Try adjusting the oil level first, and if the issue persists, consider servicing the damper components or seeking professional assistance.
Customization and Optimization for Better Performance
1. Adjusting Air Pressure
The Kage RC shock allows for precise adjustment of air pressure, which directly impacts the bike’s suspension performance. Adjust the air pressure based on your weight, riding style, and trail conditions to fine-tune the shock’s performance.
2. Upgrading to Higher-Quality Oil
For smoother operation and increased durability, consider upgrading to higher-quality suspension oil. Some riders opt for oils with better viscosity stability, which can improve shock consistency in varying temperatures.
3. Fine-Tuning Rebound and Compression Settings
The Kage RC comes with adjustable rebound and compression settings. Use these settings to tailor the shock’s performance to specific riding conditions, such as smoother terrain or more aggressive downhill riding.
Comparing the Kage RC with Similar Models
When compared to other shocks in the RockShox lineup, such as the Monarch or the Vivid, the Kage RC offers a solid balance of performance and reliability. It’s a popular choice for riders who want a dependable shock without the complexity of more advanced models.
- Monarch: The Monarch offers a more compact and lighter design but may not offer the same level of customization as the Kage RC. It’s better suited for cross-country riders.
- Vivid: On the other hand, the Vivid is designed for more aggressive riders and offers a higher level of performance in extreme conditions but comes with a higher price point.
The Kage RC strikes a balance between performance and ease of maintenance, making it a great choice for riders who want reliability without excessive maintenance requirements.
Compatibility with Other Drivetrain Components
The Kage RC rear shock is compatible with most standard mountain bike frames, including those with a 7.875” (200mm) eye-to-eye measurement. However, it’s crucial to check that your bike frame has the correct shock mount standards and that the shock’s travel is appropriate for your frame. While the Kage RC is primarily used for trail and enduro bikes, it can also be used with some all-mountain bikes. Ensure that the shock’s specifications match your bike frame’s requirements before installing it.
With proper maintenance, the Kage RC shock will continue to provide reliable performance over the long term. Regular oil changes and proper adjustments are key to maximizing its lifespan and performance on the trail.