DIY Guide: Suspension Fork Inspection for Boxxer Select RC

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The Boxxer Select RC [paid link] from RockShox is a high-performance suspension fork designed to handle the demands of downhill mountain biking and aggressive riding. Regular inspection and maintenance of your Boxxer Select RC [paid link] will ensure it continues to perform at its best. This guide covers the essential steps for inspecting, adjusting, and maintaining your suspension fork, as well as troubleshooting common issues.

Tools Required

  • 5mm, 6mm, and 8mm Allen wrenches [paid link]
  • Torque wrench [paid link]
  • Shock pump
  • Suspension oil (specific to your model)
  • Cleaning supplies (rags, brush, degreaser)
  • 10mm socket wrench
  • T25 Torx driver
  • Bicycle stand (optional)

Fork Inspection

1. Visual Inspection

Begin by thoroughly inspecting your Boxxer Select RC for any visible damage. Check for cracks, dents, or bends in the fork legs, stanchions, and lowers. Ensure the fork seals are intact and free from tears. Any visible damage can lead to poor performance and even failure if left unchecked, so replacing damaged parts is critical.

2. Check the Stanchion Condition

The stanchions should be smooth, free of scratches or pitting, as these imperfections can affect the fork’s performance. If you notice any damage to the stanchions, such as scratches or scoring, it is important to have the fork serviced, as this can damage the fork seals and cause air or oil leakage.

3. Examine the Seals and Bushings

Inspect the fork seals for signs of wear, dirt, or oil leakage. The seals should fit snugly and prevent contaminants from entering the fork. If you notice excess oil or dirt around the seals, it may indicate they need replacing. Also, check the bushing for smoothness when the fork compresses and rebounds; any roughness or grinding sensation suggests that the bushings may need lubrication or replacement.

Suspension Performance Check

1. Air Pressure Adjustment

The Boxxer Select RC uses an air spring system. Begin by checking the air pressure to ensure it matches your weight and riding style. Use a shock pump to adjust the air pressure in the positive and negative chambers. The recommended air pressure can typically be found in the owner’s manual or the side of the fork. If the air pressure is too low, the fork will feel too soft and could bottom out during heavy impacts. If the pressure is too high, the fork may feel harsh and have insufficient small bump compliance.

2. Compression and Rebound Damping

Ensure that the compression and rebound damping adjusters are functioning correctly. Adjust the compression knob to test whether the fork reacts appropriately to pressure. The rebound damping should also be tested by compressing the fork and observing how quickly it returns to the starting position. A fork with poor rebound damping can make it difficult to control the bike, especially after landing jumps or during rapid descents.

3. Check for Leaks

Another important performance check is to inspect the fork for any signs of oil leakage. If oil is leaking from the seals or other components, it can significantly degrade the fork’s performance. A small amount of leakage around the seals can usually be cleaned, but consistent leakage may require a rebuild or seal replacement.

Suspension Fork Adjustments

1. Adjusting Air Pressure

For optimal performance, adjust the air pressure to your weight. To do this, start by measuring the sag. Sag is the amount the fork compresses under your body weight, and it should be around 20-30% of the total travel for the Boxxer Select RC. If you’re unsure of the exact pressure needed, start with the manufacturer’s recommended pressure and adjust from there.

2. Compression Damping Adjustment

The compression damping controls how quickly the fork compresses when hitting obstacles. To adjust the compression damping, rotate the compression knob on the right side of the fork (if it’s equipped with one). Start with a middle setting and gradually increase or decrease the compression based on your riding style. A stiffer setting is useful for aggressive riding or downhill racing, while a softer setting is better for smooth trails and comfort.

3. Rebound Damping Adjustment

The rebound damping determines how quickly the fork returns to its original position after compression. A slower rebound is useful for rougher terrain, as it helps maintain control. To adjust, turn the rebound knob (located on the bottom of the right leg) to increase or decrease the rebound speed. Start with the rebound set to the middle and fine-tune from there.

Common Set-Up Issues and Troubleshooting

1. Fork Bottoming Out

If your Boxxer Select RC bottoms out too easily, it could be a sign of insufficient air pressure, worn-out seals, or improper damping. Begin by checking the air pressure and increasing it slightly if necessary. If the fork continues to bottom out, check the compression damping setting to ensure it is adequately adjusted for the terrain you are riding.

2. Unstable Rebound

If the rebound of the fork is too slow or too fast, it can affect control and comfort. Start by adjusting the rebound damping to the middle setting, then gradually fine-tune it. If adjusting the rebound doesn’t solve the problem, check the oil level and cleanliness, as dirty or insufficient oil can cause inconsistent rebound behavior.

3. Noisy Fork

A noisy fork is often caused by air or oil leakage, or dirt build-up in the seals. Check the seals and clean them with a soft rag. If the noise persists, inspect the fork for any internal damage or wear that might require a full rebuild or servicing by a professional.

Fork Maintenance

1. Cleaning the Fork

Regular cleaning is essential to maintain the Boxxer Select RC’s performance. After every ride, wipe down the fork’s lowers and seals with a clean cloth to remove dirt and debris. Use a mild degreaser if necessary but avoid harsh chemicals that may damage the fork’s finish. Keeping the fork clean will help prevent wear on the seals and internal components.

2. Lubricating the Fork

Lubricating the fork’s seals and stanchions is crucial for smooth performance. Use a specialized suspension lubricant designed for your fork model and apply it to the stanchions before each ride. Avoid over-lubricating, as excess oil can attract dirt and debris, leading to seal wear and performance issues.

3. Rebuilding the Fork

While the Boxxer Select RC is a durable fork, it will require periodic maintenance, including oil changes and seal replacement. A full rebuild should be performed every 50-100 hours of riding, depending on how aggressively the fork is used. This involves disassembling the fork, cleaning all components, replacing worn seals, and refilling the fork with the appropriate oil.

Compatibility with Other Drivetrain Components

The Boxxer Select RC is designed to work with a variety of downhill and enduro bikes. When selecting compatible components, such as the headset, brake mounts, and axles, ensure that the fork’s specifications match the frame of your bike. The Boxxer Select RC uses a 20mm thru-axle system, so make sure your frame is compatible with this type of axle.

Conclusion

Regular inspection, maintenance, and adjustment of your RockShox Boxxer Select RC fork will help ensure it delivers optimal performance on the trail. By performing these checks and addressing common issues promptly, you can extend the life of your fork and enjoy a smoother, more controlled ride. Always refer to the manufacturer’s specifications and consult a professional mechanic if you encounter any significant issues that require advanced repairs.