The Mara Pro Trunnion [paid link] rear shock by Manitou is a highly regarded component designed for superior performance and durability. Whether you are replacing an old shock or upgrading your bike’s suspension, understanding how to install, adjust, maintain, and optimize the Mara Pro Trunnion [paid link] can significantly enhance your riding experience. This guide provides a complete overview of this rear shock, including installation, troubleshooting, performance optimization, and compatibility insights.
Tools Required
- Shock pump
- 5mm Allen wrench [paid link]
- 3mm Allen wrench [paid link]
- Torque wrench [paid link]
- Rags or cleaning cloth
- Isopropyl alcohol
- Manitou Mara Pro [paid link] Trunnion-specific seal kit (for maintenance)
- Suspension fluid (specific to the Mara Pro [paid link] Trunnion)
Installation of the Mara Pro Trunnion Rear Shock
Installing the Mara Pro Trunnion rear shock is a straightforward process, but it requires careful attention to detail. Below is a step-by-step guide to help you with the installation:
- Remove the Old Shock
Start by removing the old shock from your bike frame. Use a 5mm Allen wrench to undo the bolts securing the shock to the frame and linkage. Keep track of any washers, nuts, or spacers that may be used. - Prepare the New Shock
Before installing the new Mara Pro Trunnion shock, check the shock for any visible damage. Ensure that the seals are intact and that the shock has the appropriate amount of oil for optimal performance. - Attach the Shock to the Frame
Using the 5mm Allen wrench, attach the Mara Pro Trunnion shock to the frame. Align the trunnion mount with the frame’s mounting points. Tighten the bolts in a criss-cross pattern to ensure even pressure distribution. - Set the Sag
Set the shock’s sag by adjusting the air pressure with a shock pump. The recommended sag for the Mara Pro Trunnion is typically between 25-30% of the shock’s total travel, depending on the rider’s weight and preferences. - Final Tightening
Once the shock is mounted, ensure all bolts are tightened to the manufacturer’s recommended torque specifications using a torque wrench [paid link]. Double-check the alignment and stability of the shock.
Adjustment of the Mara Pro Trunnion Rear Shock
The Mara Pro Trunnion rear shock features several adjustments that allow riders to fine-tune their suspension settings for optimal comfort and performance. The following adjustments are available:
- Rebound Damping
The rebound adjustment controls how quickly the shock returns to its normal position after compression. For faster rebound, turn the rebound knob counterclockwise. For slower rebound, turn the knob clockwise. Adjust this based on your riding style and terrain. - Compression Damping
Compression damping controls the shock’s resistance to compression. The Mara Pro Trunnion has both high-speed and low-speed compression adjustment. Adjusting the low-speed compression can affect how the shock behaves under pedaling forces, while high-speed compression will affect impacts from rough terrain. - Air Pressure
Air pressure in the shock should be adjusted according to your weight and preferred ride characteristics. As mentioned, aim for 25-30% sag. Adjust the air pressure to achieve this level, and fine-tune based on personal preferences for ride stiffness and support. - Lockout Function
The Mara Pro Trunnion features a lockout function for situations where you want a firmer ride, such as when climbing or on smooth trails. Engaging the lockout will stiffen the shock, preventing it from compressing under light loads.
Maintenance of the Mara Pro Trunnion Rear Shock
Regular maintenance is essential to keep the Mara Pro Trunnion shock performing at its best. Here are some key maintenance tasks:
- Cleaning the Shock
After every ride, wipe the shock with a clean rag or cloth to remove dirt and debris. This helps prevent dirt from damaging the seals. Use isopropyl alcohol to clean the shock body and ensure there is no oil or grease buildup. - Check the Seals
Inspect the seals regularly for signs of wear, such as cracks or excessive leakage. If the seals appear worn, replace them with a Manitou Mara Pro Trunnion-specific seal kit. Replacing seals can prevent oil leakage and extend the lifespan of the shock. - Change the Oil
Over time, the oil in the shock can degrade, leading to reduced performance. Manitou recommends changing the oil every 50-100 hours of riding, depending on usage. Ensure that you use the correct suspension fluid for the Mara Pro Trunnion shock. - Re-grease the Mounting Hardware
Apply a light layer of grease to the mounting hardware during installation and maintenance. This prevents rust and corrosion and ensures smooth movement when the shock is under load. - Check Air Pressure Regularly
Keep an eye on the air pressure, as it can fluctuate due to temperature changes or leaks. A proper air pressure check before each ride will ensure optimal performance.
Troubleshooting Common Issues with the Mara Pro Trunnion Rear Shock
Despite its durability, the Mara Pro Trunnion rear shock can experience a few issues that require troubleshooting. Here are common problems and their solutions:
- Shock Doesn’t Hold Air Pressure
If the shock loses air quickly, it may have a puncture or a faulty valve. Inspect the valve for leaks or damage. If you find any, replace the valve or the entire shock. If the issue persists, check the seals and the air chamber for any damage. - Poor Rebound Performance
If the shock rebounds too quickly or too slowly, the rebound setting may need adjustment. Try turning the rebound knob in small increments to find the ideal setting. If the issue continues, the internal components may need servicing. - Noise from the Shock
A knocking or squeaking noise may indicate that dirt has gotten into the shock’s moving parts. Clean and inspect the shock thoroughly. If the noise persists, check the mounting hardware and replace any worn or damaged components.
Customization and Optimization for Better Performance
The Mara Pro Trunnion is designed for customizable performance. Here are some ways to optimize its settings for your riding style:
- Tune for Terrain
Adjust the compression and rebound damping based on the type of terrain you ride most often. For technical trails with lots of drops and rough terrain, a higher compression damping and slower rebound will offer better control. For smoother trails, try reducing the compression to maximize comfort. - Adjust for Rider Weight
As a general rule, heavier riders will need higher air pressure to achieve the proper sag. Lighter riders will need less pressure. Fine-tune the air pressure to maintain the recommended 25-30% sag range for a balanced and responsive ride. - Lockout for Efficiency
Use the lockout feature during climbs or when riding on smooth, flat terrain to maximize pedaling efficiency. This setting reduces unnecessary suspension movement and conserves energy.
Compatibility with Other Drivetrain Components
The Mara Pro Trunnion rear shock is designed for use with modern mountain bikes that feature trunnion mounts. It is crucial to check compatibility with your bike’s frame and linkage system before installation. Ensure that the shock’s travel length, mounting hardware, and trunnion specifications align with your frame’s requirements.
If you are integrating the Mara Pro Trunnion with other drivetrain components, such as a specific rear derailleur or shock linkage, verify that the shock’s geometry complements the rest of your bike’s setup. The right combination of drivetrain and shock settings will enhance overall performance and ride comfort.