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Bearing Buddy: Fallen Off or Stolen?

by | Oct 16, 2017 | Trailer & Caravan Safety | 0 comments

Has your Bearing Buddy fallen off or was it stolen? This simple question has never satisfactorily been answered.

Theft from the boat ramp is the popular culprit but is it true?

There is overwhelming support for the theory of stolen a Bearing Buddy that we decided to investigate the science.

We have measured hubs and drums from Alko and found them to be the most accurate.

Other brands did not fare as well with both loose-fitting machine fits and out of round fits. The out of round fit means the bearing buddy would spin in an elliptical fashion and eventually sping itself out of the hub.

Standard Compression Dust Caps

Standard dust caps are a compression or taper fit. The outside of the lip is larger than the profile of the lip of the dust cap. The inside ID of a hub can vary by 0.2mm.

When the dust cap is inserted into a trailer hub, the outer lip is compressed against the inside of the hub (the hub boss).American Bearing Buddy

Therefore, the pressure keeps the dust cap in position thereby making a compression fit flexible enough to make a good seal with variation in hub sizes.

Bearing Buddy

Bearing Buddy, also called bearing a protector. is a machine fit as opposed to a compression fit. Machine fit sizes are not as flexible as compression fits.

You may lose your bearing buddy on the first bump in the road unless you are aware of precautions.

For example, Australian parallel or 2t hubs are 63.1mm on average. Variations are 63.00mm – 63.4mm

In reality, a 63mm bearing buddy will fall off the wheel at the first bump where a 63.4mm unit will be difficult to insert.

Why Caravan Bearings and Boat Bearing fail

Finally, here is your fix

Locktite, locktite, locktite. Chose a Medium strength locktite even if your bearing buddy® is tight. Do not use high strength or you will NEVER get it off to adjust your bearings. Umm, too late? Have you already used the high strength locktite? Well, I am afraid you will have to use a 5kg lump hammer and whack it off!!

Finally, buy Bearing Buddy for Trailers & Caravans … click here.

Has Bearing Buddy fallen off or was it stolen?


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