3 Steps to Find the Right Bearing Buddy Size Chart

Choosing the correct Bearing Buddy size is crucial for protecting your trailer’s wheel bearings. This article streamlines that process, offering actionable methods, unique insights, and expert-backed information to ensure you select the perfect fit and extend the life of your trailer’s bearings. We’ll cover a practical approach to sizing, share some often-overlooked considerations gained from years of trailering, and provide essential resources to confidently choose the right Bearing Buddy for your needs.

Bearing Buddies are designed to maintain a slight pressure of grease inside your wheel hub, preventing water and contaminants from entering and causing bearing damage. A properly sized Bearing Buddy is essential for this system to function correctly. An incorrectly sized Bearing Buddy can lead to either insufficient grease pressure, resulting in water intrusion, or excessive pressure, potentially damaging the grease seals.

The first step in finding the right Bearing Buddy size is accurately measuring your wheel hub. Don’t rely on assumptions or guesswork – precise measurements are key.

Determining the Correct Hub Bore Diameter

This is arguably the most critical measurement. The Bearing Buddy needs to fit snugly into the hub bore.

1. Remove the existing dust cap: Carefully remove the dust cap from your trailer’s wheel hub.
2. Measure the inside diameter (ID): Use a caliper to measure the inside diameter of the hub bore. This is the opening where the Bearing Buddy will be inserted. Ensure you measure at multiple points around the bore to account for any potential irregularities.
3. Record the measurement: Note the measurement in inches. This is the critical dimension you’ll use to select the correct Bearing Buddy size.

Confirming Spindle Nut Size (If Necessary)

Some Bearing Buddy models also require you to know the spindle nut size. This is less common, but crucial if the model you choose relies on this for secure attachment.

1. Expose the spindle nut: Remove the cotter pin and any retaining hardware securing the spindle nut.
2. Measure the nut across the flats: Use a wrench or socket to determine the size of the spindle nut. Alternatively, you can measure the nut across its flats with a caliper.
3. Record the measurement: Note the size of the spindle nut.

Once you have your measurements, it’s time to consult a Bearing Buddy size chart. Many manufacturers, like UFP (Unique Functional Products), provide charts to help you match your hub measurements to the correct Bearing Buddy model.

Finding a Reliable Bearing Buddy Size Chart

• Manufacturer Websites: The best place to find a size chart is directly on the Bearing Buddy manufacturer’s website. UFP is a popular brand, and their website offers detailed sizing information.
• Retailer Websites: Many online retailers that sell Bearing Buddies also provide size charts or compatibility tools.
• PDF Downloads: Some websites offer downloadable PDF versions of Bearing Buddy size charts for easy reference.

Interpreting the Size Chart: A Practical Approach

The chart will typically list Bearing Buddy models and their corresponding hub bore diameters.

1. Locate your hub bore diameter: Find the measurement you took in Step 1 on the size chart.
2. Identify the corresponding Bearing Buddy model: The chart will indicate which Bearing Buddy model is compatible with your hub bore diameter.
3. Double-check the spindle nut size (if applicable): If the Bearing Buddy model you’ve identified requires a specific spindle nut size, ensure your spindle nut matches.
4. Confirm compatibility: Before purchasing, confirm the compatibility with your specific trailer axle and bearing type. Consult your trailer’s manual or a qualified mechanic if you’re unsure.

While a size chart is a great starting point, consider these practical insights gathered from years of experience with trailer maintenance.

The “Slightly Snug” Principle

The Bearing Buddy should fit snugly into the hub bore. If the chart indicates that your measurement falls between two sizes, it’s generally better to opt for the slightly larger size and use a thin shim if necessary to achieve a secure fit. A loose fit is far more problematic than a slightly tight fit.

Grease Type Matters

The type of grease you use can affect the performance of your Bearing Buddy system. Use a high-quality, marine-grade grease specifically designed for wheel bearings. These greases are water-resistant and provide excellent lubrication, even in harsh conditions. Avoid using general-purpose greases, as they may not provide adequate protection.

Visual Inspection is Key

Even after installing the Bearing Buddy, regularly inspect it for signs of leaks, damage, or excessive grease build-up. These signs can indicate a problem with the Bearing Buddy itself, the wheel bearings, or the grease seals. Address any issues promptly to prevent further damage.

Avoiding Over-Greasing: A Common Mistake

It’s tempting to pump a lot of grease into the Bearing Buddy, but over-greasing can be detrimental. Excessive pressure can damage the rear grease seal, leading to grease leaking onto your brakes. Follow the manufacturer’s instructions for proper greasing procedures. The Bearing Buddy typically has a spring-loaded piston that provides visual indication of the grease level.

Through years of towing trailers for both work and recreation, I’ve learned some valuable lessons about Bearing Buddies that you won’t find in a typical manual:

• Saltwater is the Enemy: If you frequently launch your boat in saltwater, consider investing in stainless steel Bearing Buddies. They are more resistant to corrosion and will last longer.
• Regular Maintenance is Essential: Don’t wait until you notice a problem. Regularly inspect and grease your Bearing Buddies, especially before and after long trips.
• Carry a Spare: Keep a spare Bearing Buddy and grease seal in your trailer’s toolbox. This can save you from being stranded on the side of the road.
• Document Everything: Keep a maintenance log that records when you greased your bearings, replaced seals, and inspected the Bearing Buddies. This helps track wear and tear and schedule preventative maintenance.
• Feel the Hub After a Drive: After a long drive, carefully touch the hub. If it’s excessively hot, it’s a sign of a bearing issue, even if the Bearing Buddy looks okay. Pull over and investigate immediately.

While I’ve shared my practical experience, it’s also crucial to consult with experts and reputable sources.

• Trailer Mechanics: A qualified trailer mechanic can provide personalized recommendations for Bearing Buddy selection and installation.
• Bearing Buddy Manufacturer Websites: These websites offer detailed product information, installation instructions, and troubleshooting tips.
• Online Forums: Online forums dedicated to trailers and RVs can be a valuable source of information and advice from other trailer owners.

Reference:
* Trailer Wheel Bearing Maintenance: https://en.wikipedia.org/wiki/Wheel_bearing#Trailer_wheel_bearing_maintenance

While exact sizes vary between manufacturers, here’s a general example of what a Bearing Buddy size chart might look like. Always refer to the manufacturer’s specific chart for accurate sizing.

Note: This table is for illustrative purposes only. Always consult the manufacturer’s size chart for accurate measurements.

By following these steps, incorporating my personal insights, and consulting with experts, you can confidently choose the right Bearing Buddy size for your trailer and enjoy years of trouble-free towing.

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