How Trailer Bearings Work

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If you own a trailer or plan to use one soon, it pays to recognize how bearings work and how to keep them in good repair. Bearings require regular maintenance, such as greasing, to keep them rolling. With enough wear and tear, you may even have to replace them. This article "How Trailer Bearings Work" from Robert Lamb will definitely give you a better understanding with your bearing endeavor.
http://auto.howstuffworks.com/auto-parts/towing/equipment/accessories/trailer-bearings.htm