The DB Kitsuma Trunnion [paid link] rear shock from Cane Creek is a high-performance suspension component designed for demanding mountain bikers. It delivers exceptional control and comfort, making it a popular choice for riders looking to enhance their bike’s handling and shock absorption. This guide will cover installation, adjustment, maintenance, troubleshooting, and optimization of the DB Kitsuma Trunnion [paid link], with a focus on maximizing its performance.
Tools Required
- Torque wrench [paid link]
- 8mm Allen key
- 10mm Allen key
- 15mm spanner wrench
- Shock pump
- Oil (Cane Creek recommended or compatible)
- Clean rag
- Suspension grease
- Small flathead screwdriver
Installation of the DB Kitsuma Trunnion
Step 1: Prepare the Bike
Before installing the DB Kitsuma Trunnion shock, ensure that your bike is in a stable position. Use a bike stand [paid link] or a suitable surface to keep the bike steady. Remove the existing rear shock if necessary.
Step 2: Align the Shock Mounts
The DB Kitsuma Trunnion uses a trunnion mount, which features two bolts securing the shock to the frame. Align the shock with the mounting points on the bike frame. Ensure that the shock’s eyelet holes are properly positioned for easy installation. The orientation of the shock should match the frame’s design for optimal performance.
Step 3: Install the Trunnion Mount
Using the appropriate 8mm Allen key, attach the shock to the frame. Ensure that the trunnion mounting hardware is tightened to the manufacturer’s recommended torque specifications. Use a torque wrench [paid link] to ensure accuracy, typically around 25-30Nm, but verify the exact figure based on the bike frame specifications.
Step 4: Install the Rear Shock Locknut
Once the shock is secured to the frame, install the locknut using a 10mm Allen key. Tighten it just enough to secure it without over-tightening, as this could cause damage to the shock or frame.
Step 5: Reinstall the Spring
If the shock uses a coil spring, install it carefully, ensuring it sits snugly in place. Make sure there’s no play or unnecessary movement before proceeding to the next step.
Step 6: Set the Sag
To complete the installation, set the sag using a shock pump. The sag refers to the amount the shock compresses under rider weight. For optimal performance, aim for around 30% sag. Adjust the air pressure in the shock using the shock pump to achieve this. The correct air pressure will vary depending on rider weight and riding style.
Adjustment of the DB Kitsuma Trunnion
The DB Kitsuma Trunnion features various adjustment settings to fine-tune the suspension’s performance. These adjustments allow riders to customize their ride for specific conditions, from cross-country racing to aggressive trail riding.
High-Speed Compression
High-speed compression controls how the shock behaves during fast hits, such as when riding over rocks or obstacles. To adjust high-speed compression, turn the knob located near the shock’s body. Clockwise increases compression, providing firmer support. Counterclockwise softens the shock, allowing more movement for better absorption of rough terrain.
Low-Speed Compression
Low-speed compression affects how the shock responds to slower, more controlled movements. Adjust this setting to tailor the shock’s behavior when cornering or riding over smoother terrain. Turning the dial clockwise will stiffen the shock, while counterclockwise reduces resistance for a more plush ride.
Rebound Damping
Rebound damping controls how quickly the shock returns to its normal position after compression. If the shock rebounds too quickly, it can cause the bike to feel unstable, while too slow of a rebound can lead to sluggish performance. Adjust the rebound damping dial on the bottom of the shock. Clockwise reduces rebound speed, while counterclockwise increases it. A balanced rebound setting will keep the bike stable while maintaining responsiveness.
Air Pressure and Volume Spacers
The DB Kitsuma Trunnion allows for the adjustment of air pressure and volume spacers to fine-tune the overall feel of the shock. Adjusting air pressure alters the shock’s spring rate, while adding or removing volume spacers changes the shock’s ramp-up rate at the end of the stroke. Experiment with different setups to find the ideal balance between plushness and bottom-out resistance.
Maintenance of the DB Kitsuma Trunnion
To ensure optimal performance and longevity, regular maintenance of the DB Kitsuma Trunnion is essential.
Cleaning
After each ride, clean the shock with a rag to remove dirt, mud, and debris. This prevents contamination of the shock’s internals and ensures smooth operation. Be careful not to introduce moisture into the shock’s seals.
Lubrication
Lubricate the shock’s mounting bolts and bushings periodically with suspension grease. This reduces wear and helps maintain a smooth interface between the shock and frame. Regularly inspect the mounting hardware for any signs of wear, and replace it if necessary.
Seals and Oil Changes
Over time, the shock’s internal seals can wear, and oil can degrade. Cane Creek recommends changing the oil every 50-100 hours of riding or annually, depending on the riding conditions. Use the recommended oil and follow the manufacturer’s service guidelines for disassembly and reassembly. Pay close attention to the seals during servicing and replace them as needed to prevent air or oil leakage.
Air Spring Maintenance
Periodically check the air spring pressure and adjust as needed to maintain the correct sag. If the shock feels inconsistent or loses pressure quickly, it may be time to service the air spring. Consult the user manual for instructions on disassembling the air spring for maintenance.
Troubleshooting Common Set-Up Issues
Loss of Air Pressure
If the shock loses air pressure quickly, inspect the valve and seals for leaks. Use soapy water to check for bubbles around the valve area. If leakage is detected, replace the valve core or seals. If the problem persists, the shock may require a full service.
Inconsistent Rebound
If the rebound is too fast or slow, adjust the rebound knob accordingly. If the issue remains, inspect the shock for internal damage or contamination that may be affecting the damping performance.
Excessive Sag or Firmness
If the shock feels too firm or too soft, adjust the air pressure to reach the correct sag. If the sag is still incorrect after adjusting the air pressure, consider adding or removing volume spacers to modify the shock’s compression characteristics.
Customization and Optimization for Better Performance
Adjusting for Riding Style
The DB Kitsuma Trunnion can be further optimized by adjusting the settings to match your riding style. Riders who prefer aggressive downhill riding may benefit from increased low-speed compression and a slightly slower rebound, while cross-country riders might prefer a softer, more responsive shock.
Upgrading to the Coil Option
For riders seeking the ultimate in plushness and small bump sensitivity, Cane Creek offers a coil spring upgrade for the DB Kitsuma Trunnion. This option provides a more consistent and predictable feel, especially on rougher terrain. Be sure to choose the right spring rate for your weight and riding style.
Comparison with Similar Models
The DB Kitsuma Trunnion competes with other high-performance rear shocks such as the Fox Float X2 and RockShox Super Deluxe. While all three models offer excellent damping performance and adjustability, the DB Kitsuma Trunnion stands out with its unique trunnion mount design, which provides additional stiffness and improved sensitivity. Additionally, Cane Creek’s dual-volume chamber system allows for finer control over the shock’s response compared to the competition.
When compared to other options, the DB Kitsuma Trunnion offers a more customizable ride for riders who are looking to fine-tune their suspension for different conditions. It’s especially suitable for riders who prioritize performance on technical trails and rough terrain.
Compatibility with Other Drivetrain Components
The DB Kitsuma Trunnion is compatible with most modern mountain bike frames that use a trunnion mount for rear shock installation. However, it’s important to ensure that the shock’s stroke length and mount specifications are compatible with your bike’s design. Check your bike’s frame dimensions and consult the manufacturer’s guidelines before purchasing to avoid compatibility issues.
Ensure that the rear shock’s performance characteristics align with the other drivetrain components, such as the suspension fork. Mismatched suspension setups can lead to inconsistent handling, so aim to create a balanced suspension system between the front and rear.