The bearings have survived a few hard rides, but it's hard to say about durability as they're still fresh. But please do yourself a favor and lubricate these things with wheel bearing grease. I had a separate one after installation and it looks like they use white lithium grease. It may be advertised as marine grade grease, but it's poor quality, to say the least. I was very disappointed with the quality of the Super ATV grease they use in it.
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