These bearings don't work as well as my Swiss 6 bearing set. When the bearing spins it starts to spin quickly then the balls close and immediately slow the bearing. They felt noticeably slower when driving and during freeplay tests than the Swiss 6, Bronson G3, Bronson Raw, Spaceballs and Oldboy and Ceramics Chrome. These didn't go well at all. I've cleaned them with acetone and tried different lubes but they didn't help the bearing. They are poorly made and have too much play. They are as good as the ABEC 3 bearings I had on my longboard. For the money I would recommend the Bronson G3 or Raw, they can actually be faster than the Swiss 6. The world speed record on a skateboard was set on the Bronson G3. I would recommend Swiss 6 if you want Swiss machining standards bearings and don't want to support Chinese labor practices.
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