bearing failures can be reduced greatly by cleaning and greasing after each ride but we all know most people won’t do that lol. I let my kids ride about 3 hrs on there brand new quads before checking the bearings. I found that almost every bearing had little to no grease in it. I since bought spares and checked a few right out of the package to find the same thing barely any grease in them. I highly recommend staying on top of greasing every moving part
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