The Mara Pro Trunnion [paid link] rear shock from Manitou is a highly regarded component in the world of mountain biking. Designed with a combination of cutting-edge technology and performance-enhancing features, it promises an exceptional riding experience for riders seeking the best in suspension performance. This detailed guide will walk you through the installation, adjustment, maintenance, troubleshooting, and optimization of the Mara Pro Trunnion [paid link] rear shock. It will also provide insights into its compatibility with other drivetrain components, its comparison to similar models, and how you can customize it for better performance on the trail.

Tools Required

• 5mm, 8mm, and 10mm Allen wrenches [paid link]
• Torque wrench [paid link]
• Shock pump (preferably one with a digital pressure gauge)
• Suspension grease
• Soft cloth
• Isopropyl alcohol
• Thread locker (optional)

Installation of the Mara Pro Trunnion Rear Shock

Installing the Mara Pro [paid link] Trunnion rear shock on your mountain bike is a relatively straightforward process, but it requires precision to ensure optimal performance. Follow these steps for a seamless installation:

1. Remove the old shock: If you’re replacing an existing shock, start by detaching it from the bike frame. Use a 5mm Allen wrench [paid link] to remove the bolts securing the shock to the bike’s rear triangle. Make sure to keep the bolts in a safe place for reinstallation.
2. Clean the mounting areas: Before installing the new shock, clean the shock mount points on both the frame and the shock itself. Use a soft cloth and isopropyl alcohol to ensure no dirt or debris will interfere with the mounting process.
3. Position the shock: Align the Mara Pro [paid link] Trunnion shock with the mounting points on your bike frame. Ensure that the eyelet or trunnion mount fits perfectly into the shock’s mounting hardware.
4. Attach the shock: Using the appropriate Allen wrenches [paid link], secure the shock to the frame. Tighten the bolts to the manufacturer’s recommended torque settings (typically 8-10 Nm), ensuring they are not over-tightened, which could damage the shock or frame.
5. Check the setup: Ensure that the shock is mounted securely and that there is no play or movement. The shock should move freely within its range of motion but should not be loose.

Adjusting the Mara Pro Trunnion Rear Shock

One of the key advantages of the Mara Pro Trunnion is its adjustability. Fine-tuning the shock to suit your riding style and terrain is crucial for maximizing comfort and performance. Here’s how to adjust it:

1. Set sag: The Mara Pro Trunnion features an adjustable air spring, and setting the correct sag is essential. To do this, use a shock pump to inflate the shock to the recommended pressure based on your rider weight (usually indicated on the shock’s label). Check the sag by sitting on your bike and measuring the amount the shock compresses. Aim for around 30-35% sag for optimal performance.
2. Adjust rebound: The Mara Pro Trunnion includes an adjustable rebound setting. To adjust it, turn the rebound knob located on the shock’s lower body. For faster rebound, turn the knob counterclockwise; for slower rebound, turn it clockwise. Start with a neutral setting and make small adjustments based on the type of terrain you ride.
3. Fine-tune compression: The compression settings on the Mara Pro Trunnion allow you to adjust the shock’s response to impacts. If you are riding rough terrain, a firmer compression setting may be beneficial, while smoother trails may call for a softer setting. Use the compression knob to fine-tune the setting based on your preferences.
4. Lockout feature: The Mara Pro Trunnion comes equipped with a lockout feature for improved pedaling efficiency on smoother trails. Use the lockout lever to engage this feature when you don’t need suspension travel, such as during climbs or on flat ground.

Maintenance of the Mara Pro Trunnion Rear Shock

To ensure the Mara Pro Trunnion rear shock continues to perform at its best, regular maintenance is essential. Here’s a breakdown of the key maintenance tasks:

1. Clean after each ride: After every ride, especially on muddy or dusty trails, wipe down the shock with a soft cloth. Use isopropyl alcohol to remove any grease, dirt, or grime from the shock’s surface. This will prevent dirt from entering the shock and causing wear.
2. Inspect for damage: Periodically inspect the shock for signs of wear or damage, such as oil leaks or bent shafts. If you notice any damage, it’s important to address it immediately to avoid further issues.
3. Check air pressure: Check the air pressure regularly to ensure it’s within the recommended range. Air pressure can drop over time, and maintaining proper pressure is crucial for maintaining the shock’s performance.
4. Service the shock: Depending on the frequency of use and the riding conditions, it’s a good idea to send the Mara Pro Trunnion for a full service every 12-18 months. This typically involves a complete overhaul, including the replacement of seals, oil, and other internal components.

Troubleshooting Common Set-Up Issues

While the Mara Pro Trunnion rear shock is known for its reliability, like any mechanical component, it can experience issues. Here are some common problems and how to troubleshoot them:

1. Shock not holding air: If the shock loses air pressure rapidly, it could indicate a leak in the air chamber. Inspect the shock for visible signs of damage, such as cracks or punctures in the air sleeve. If the shock is leaking, it may require servicing or replacement of the internal seals.
2. Excessive rebound or slow rebound: If the rebound is either too fast or too slow, you may need to adjust the rebound knob. Make small adjustments and test ride the bike to find the ideal setting.
3. Squeaking or creaking noises: If you hear unusual noises from the shock, it could be caused by insufficient lubrication or dirty mount points. Clean and lubricate the shock’s mounting hardware to eliminate noise.

Customization and Optimization for Better Performance

The Mara Pro Trunnion rear shock offers several customization options to enhance your riding experience:

1. Custom air spring tune: For riders who want more specific tuning, the Mara Pro Trunnion’s air spring system can be modified to suit different body weights, riding styles, and terrain types. This may include adjusting the positive and negative air chambers for better small-bump compliance and mid-stroke support.
2. Use of volume spacers: The shock includes internal volume spacers that can be adjusted to change the shock’s compression curve. Adding or removing spacers can help you fine-tune the shock’s bottom-out resistance and control over larger impacts.
3. Valving modifications: For advanced riders, the Mara Pro Trunnion’s damping system can be tuned or modified to suit different riding conditions. Upgrading the valving can improve the shock’s performance on rough, technical trails or provide a smoother feel on flowy sections.

Compatibility with Other Drivetrain Components

The Mara Pro Trunnion is compatible with a wide range of mountain bike frames and drivetrain components, provided the shock’s dimensions and mount type match the frame’s specifications. When selecting a shock, it’s important to consider the following:

1. Frame compatibility: Ensure that the frame uses a trunnion mount design, as this is a critical feature of the Mara Pro Trunnion shock. Trunnion mounts offer greater frame flexibility and better shock performance compared to traditional eyelet designs.
2. Drivetrain compatibility: While the rear shock does not directly interact with the bike’s drivetrain, compatibility with other components, such as the rear derailleur or chainstay, should be considered when choosing suspension. Make sure that the suspension setup does not interfere with chainstay clearance or drivetrain movement.

Comparison with Similar Models

When comparing the Mara Pro Trunnion rear shock to other models in the market, several key differences make it stand out:

1. Superior dampening system: Unlike some competitors, the Mara Pro Trunnion utilizes an advanced damping system that offers precise control over compression and rebound settings. This ensures better performance across varied trail conditions.
2. Lightweight design: The Mara Pro Trunnion features a lightweight, durable design, making it an ideal choice for riders looking to minimize weight without compromising on performance.
3. Advanced adjustability: While some shocks offer basic adjustment options, the Mara Pro Trunnion provides a wide range of tuning possibilities, allowing riders to customize their shock for different trail types and riding styles.

In conclusion, the Mara Pro Trunnion rear shock is a premium option for mountain bike enthusiasts who value performance, adjustability, and durability. It excels in areas such as comfort, responsiveness, and tuning flexibility, making it an excellent choice for riders looking to upgrade their suspension system. Whether you are installing, adjusting, or maintaining your Mara Pro Trunnion shock, following the guidelines provided will ensure you get the most out of your suspension setup.