Extend the Life of Your Mara Pro Trunnion Rear Shock with These DIY Hacks

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The Manitou Mara Pro Trunnion [paid link] rear shock is a high-performance component designed for durability and smooth handling on mountain and trail bikes. However, like all bike parts, it requires proper maintenance and attention to ensure its longevity and continued performance. In this guide, we’ll explore the best DIY hacks to extend the life of your Mara Pro Trunnion [paid link] rear shock, helping you get the most out of your investment.

Tools Required

  • Shock pump
  • 8mm and 10mm wrenches
  • Torque wrench [paid link]
  • Isopropyl alcohol (99%)
  • Clean rags or towels
  • Suspension grease
  • Silicone-based lubricant
  • Small brush (for cleaning)
  • Shock oil (specific to Manitou shocks)
  • T20 or T25 Torx driver (depending on model)
  • Pliers (for removing seals, if necessary)

Routine Maintenance for the Mara Pro Trunnion Rear Shock

Regular maintenance of your Mara Pro [paid link] Trunnion rear shock is critical for its longevity. Taking time to clean and lubricate the shock after every few rides or when noticeable performance issues arise can help to avoid major repairs down the line.

Cleaning the Shock

After every ride, especially if you’ve been riding in muddy or dusty conditions, cleaning your Mara Pro [paid link] Trunnion rear shock is essential. Dirt and debris can quickly degrade the performance of the shock and cause premature wear.

  • Use a clean rag soaked in isopropyl alcohol to wipe down the shock body and surrounding areas. This removes any dust, grime, or oily residues that can compromise the seals.
  • Avoid using harsh chemicals or abrasives that could damage the shock’s finish or seals.
  • Pay close attention to the eyelets and the shock mount, as these areas are prone to collecting dirt and debris.

Lubricating the Shock

Lubrication is key to ensuring smooth operation and reducing friction, which can cause wear on internal components over time.

  • Apply a small amount of silicone-based lubricant to the shock’s shaft and seals. Be sure to use a lubricant that’s specifically designed for suspension components.
  • When lubricating the seals, avoid over-applying the lubricant as this could attract more dirt.
  • Lubricate the shock’s pivot points and bushings lightly using suspension grease to maintain smooth movement when the shock compresses and rebounds.

Checking the Shock Air Pressure

Maintaining the correct air pressure in your Mara Pro Trunnion rear shock is crucial for both performance and longevity. Over- or under-inflated shocks can cause the suspension to work inefficiently, potentially leading to damage.

  • Use a shock pump to check the air pressure regularly. The recommended air pressure for the Mara Pro Trunnion varies based on rider weight and riding style, but a typical range is between 180-250 PSI.
  • If you find that the shock pressure has dropped, it could indicate a slow air leak or insufficient sealing, which will need further investigation.

Advanced Maintenance: Rebuilding the Mara Pro Trunnion Rear Shock

If you’re comfortable performing more in-depth work, you can rebuild your Mara Pro Trunnion rear shock to further extend its lifespan. This requires disassembling the shock and servicing internal components.

Disassembling the Shock

To access the internal components, carefully remove the shock from the bike frame using the proper wrenches. Ensure the shock is completely deflated before attempting any disassembly.

  • Begin by removing the shock from the frame using the appropriate 8mm or 10mm wrenches.
  • Use a torque wrench [paid link] to ensure that the shock mounting bolts are tightened to the manufacturer’s specifications during reinstallation.

Inspecting the Internal Components

Over time, parts like seals, o-rings, and bushings can wear out. Inspect these components when rebuilding the shock.

  • Remove the shock’s air valve and lower the pressure completely to access the internals.
  • Check for any wear on the piston or shock shaft. Scratches, dents, or unusual friction could be signs of damage.
  • Inspect the oil bath and replace the shock oil if it’s cloudy or has a burnt smell, indicating that it has lost its effectiveness.

Replacing Seals and O-Rings

Seals and o-rings prevent dirt and moisture from entering the shock, keeping internal components clean and functioning smoothly.

  • Carefully remove the old seals with pliers, being cautious not to damage any other parts.
  • Clean the shock body with a soft rag, and replace the seals with new, compatible ones. Lubricate the new seals lightly with suspension grease to aid in installation and improve performance.

Troubleshooting Common Set-Up Issues

Occasionally, you may encounter issues with the performance of your Mara Pro Trunnion rear shock. Below are some common problems and solutions.

Shock Not Rebounding Properly

If your shock isn’t rebounding as it should, the issue may lie with the air pressure or oil level.

  • Ensure the shock is properly inflated. Low air pressure can cause sluggish rebound.
  • If the rebound is still sluggish after adjusting the air pressure, it may be time to check the oil levels or the shock’s internal components for any wear or blockages.

Excessive Sag

Excessive sag could indicate that the shock is not properly tuned for your weight or riding style. This can lead to poor performance and potential damage to the shock.

  • Adjust the air pressure to suit your weight and riding preferences. You can use a sag chart from Manitou as a reference to ensure the sag is within the optimal range (typically 25-30%).
  • Consider adding volume spacers if you experience bottoming out frequently during aggressive riding. This can help to control the compression and prevent excessive sag.

Customization and Optimization for Better Performance

The Mara Pro Trunnion rear shock is highly customizable, allowing riders to fine-tune its performance to suit their riding style and preferences.

Adjusting the Rebound and Compression

Manitou’s Mara Pro Trunnion rear shock comes with multiple adjustments for both rebound and compression damping. These adjustments are crucial for optimizing shock performance based on terrain and personal preference.

  • Rebound adjustment: Controls how quickly the shock returns after compression. If you’re riding technical terrain with lots of drops, a slower rebound can help maintain control. On smoother trails, a faster rebound can offer better efficiency.
  • Compression adjustment: Controls how the shock reacts when you hit bumps or obstacles. If you prefer a firmer ride, turn the compression dial clockwise. For a softer, more plush ride, turn it counterclockwise.

Upgrading to Volume Spacers

Volume spacers allow riders to adjust the progressiveness of the shock’s compression. If you’re experiencing bottoming out during aggressive descents or jumps, adding volume spacers can prevent the shock from compressing too much and help improve its overall performance.

  • To install volume spacers, simply remove the air spring and insert the spacers into the designated slots. Ensure that the shock is fully deflated before starting this process.

Compatibility with Other Drivetrain Components

The Mara Pro Trunnion rear shock is designed to be compatible with a wide range of modern mountain bike frames and drivetrain components. However, compatibility with other parts, especially the rear triangle of your bike, should always be checked.

  • Ensure that the shock’s eye-to-eye length and stroke length match your bike frame’s specifications. If your bike uses a different shock configuration, the Mara Pro Trunnion may not be suitable.
  • It’s crucial to check the shock mounting hardware and ensure that it fits the frame’s shock mounts. The trunnion mounting system used by the Mara Pro is highly compatible with a variety of modern frames, but double-checking your bike’s specifications is always recommended.

Conclusion

Proper maintenance and thoughtful customization are key to ensuring the Mara Pro Trunnion rear shock performs optimally for many years. By following the tips in this guide, from basic cleaning to advanced rebuilds, you’ll keep your shock working efficiently and extend its life. Regular attention to detail, such as checking air pressure, adjusting damping settings, and replacing seals, will enhance your riding experience while minimizing the risk of costly repairs. Whether you’re a weekend warrior or a competitive rider, these DIY hacks will ensure your Mara Pro Trunnion remains a reliable and high-performing component for your bike.