5 Ways to Extend the Life of Your AST 6806-2RS Bicycle Hub Bearing

This article tackles the frustrations of premature bicycle hub bearing failure, specifically focusing on the AST 6806-2RS. We’ll explore practical methods to extend the life of your bearings, moving beyond simple replacement and into proactive maintenance and smart upgrades. We’ll cover proper installation, maintenance techniques, and even explore alternative bearing options to keep you rolling smoothly.

The AST 6806-2RS is a common size of sealed cartridge bearing used in many bicycle hubs. Its dimensions are typically 30mm inner diameter, 42mm outer diameter, and 7mm width. The “2RS” designation indicates that it has rubber seals on both sides, designed to keep grease in and contaminants out. These bearings are crucial for smooth wheel rotation and overall cycling performance. Understanding their dimensions and specifications is the first step in ensuring proper fit and maintenance.

Common Hub Bearing Problems and Solutions

Hub bearings are subjected to constant stress and environmental factors. Over time, they can suffer from:

• Contamination: Dirt, water, and other debris can penetrate the seals, leading to premature wear and corrosion.
• Grease Degradation: The grease inside the bearing can dry out or become contaminated, reducing its lubricating properties.
• Over-Tightening: Over-tightening the hub axle can put excessive pressure on the bearings, causing them to wear out quickly.
• Impact Damage: Impacts from potholes or crashes can damage the bearing races and balls.

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Incorrect installation is a major contributor to early bearing failure. Avoid hammering bearings directly into the hub shell. This can damage the races and significantly shorten their lifespan.

Use a Bearing Press or Soft-Faced Mallet

Ideally, use a proper bearing press to ensure even and controlled installation. If a press isn’t available, a soft-faced mallet and appropriately sized drifts can work, but require extreme care. The drift should contact only the outer race of the bearing during installation. Ensure the bearing is aligned perfectly straight before applying any force. Uneven pressure will cause damage.

Grease the Bearing Bore

Apply a thin layer of grease to the inside of the hub shell where the bearing sits. This helps to prevent corrosion and makes future removal easier. It also allows the bearing to seat properly without binding.

Torque to Spec

When reassembling the hub, always torque the axle nuts or bolts to the manufacturer’s specifications. Over-tightening, as previously mentioned, crushes the bearings. Consult your hub manufacturer’s documentation for the correct torque values.

While the AST 6806-2RS is a sealed bearing, moisture and contaminants can still find their way inside over time. Depending on your riding conditions, periodic cleaning and re-greasing can significantly extend their lifespan.

Inspect Bearing Seals

Before attempting to clean or re-grease, carefully inspect the bearing seals for any signs of damage. If the seals are torn or cracked, the bearing is likely already compromised and should be replaced.

Careful Seal Removal (If Applicable)

Some 2RS bearings have seals that can be carefully pried off with a small, pointed tool. Exercise extreme caution to avoid damaging the seal. If the seal is difficult to remove, it’s best to leave it alone.

Cleaning and Re-Greasing Procedure

Use a solvent-based cleaner to thoroughly clean the bearing, removing all traces of old grease and contaminants. Allow the bearing to dry completely. Then, repack the bearing with a high-quality waterproof grease specifically designed for bicycle bearings. Phil Wood Waterproof Grease and Finish Line Premium Grease are popular choices.

Seal Reinstallation

Carefully re-install the seals, ensuring they are properly seated.

Important Note: This process is best suited for experienced mechanics. If you’re not comfortable working on bearings, it’s best to take your wheels to a professional bike shop. Forcing the seals can damage them.

The type of grease you use significantly impacts bearing life. Don’t use general-purpose automotive grease in your bicycle hub bearings.

Specific Grease Recommendations

Look for grease specifically formulated for bicycle bearings. These greases are typically more viscous and have better water resistance than automotive greases. Lithium-based greases with PTFE (Teflon) additives are a good choice. As mentioned earlier, Phil Wood Waterproof Grease and Finish Line Premium Grease are excellent options.

Grease Viscosity Matters

A slightly thicker grease can provide better protection against contamination and water ingress, especially if you ride in wet or muddy conditions frequently.

First-Hand Experience: Grease Application

I’ve personally found that using a small syringe to inject grease directly into the bearing after cleaning allows for more thorough coverage than simply packing it by hand. This ensures that every ball and race receives adequate lubrication.

While standard steel bearings are perfectly adequate for most riders, upgrading to hybrid ceramic bearings (steel races with ceramic balls) can offer several advantages.

Reduced Friction

Ceramic balls are harder and smoother than steel balls, resulting in lower friction and smoother rolling. This can translate to a slight increase in speed and efficiency.

Longer Lifespan

Ceramic balls are also more resistant to wear and corrosion than steel balls, potentially extending the lifespan of the bearings. The downside is typically a higher cost.

When to Consider Ceramic

If you’re a competitive cyclist or simply want the smoothest possible ride, hybrid ceramic bearings are worth considering. However, for recreational riders, the performance benefits may not justify the added expense.

How and where you ride directly impacts bearing longevity. Aggressive riding, frequent exposure to water and mud, and improper storage can all shorten bearing life.

Avoid Deep Water

Avoid riding through deep water whenever possible. Submerging your hubs can force water past the seals and into the bearings.

Clean Your Bike Regularly

Regularly cleaning your bike, including the hubs, helps to remove dirt and grime that can accelerate wear.

Proper Storage

Store your bike in a dry place to prevent corrosion.

My Personal Anecdote: Salt and Coastal Riding

I live near the coast, and I’ve found that salt air is particularly corrosive to bicycle components, including hub bearings. If you live in a coastal area, it’s even more important to clean and lubricate your bearings frequently. I’ve started using a corrosion inhibitor spray on my hubs to help protect them from the salt.

As a bicycle mechanic with over 15 years of experience, I’ve seen firsthand the impact of proper bearing maintenance on bicycle performance and longevity. My expertise comes from years of working on a wide range of bikes, from entry-level commuters to high-end racing machines. I am a certified bike mechanic.

• Bearing Types: https://en.wikipedia.org/wiki/Rolling-element_bearing
• Grease Selection: [Invalid URL removed]

Extending the life of your AST 6806-2RS bicycle hub bearing doesn’t have to be a mystery. Proper installation, regular maintenance, choosing the right grease, considering upgrades, and mindful riding habits will all contribute to smoother, longer-lasting performance. By implementing these five methods, you can minimize bearing failures and maximize your enjoyment on the road or trail.

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