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Posted by: 914Sixer Nov 17 2020, 06:36 PM

I was not able to get the video so I took a screenshot of results of bearing testing. Found results to be interesting.


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Posted by: altitude411 Nov 17 2020, 07:02 PM

Wow. Harbor freight vs Mercedes Benz...



https://www.youtube.com/watch?v=hFBhqSscTbI

Posted by: mepstein Nov 17 2020, 07:12 PM

When I ran the bike shop, we sold skateboards. Chinese bearings were $8, German $15 and Swiss $25. This was 30 years ago. There was an obvious difference.

Posted by: fixer34 Nov 18 2020, 07:30 AM

I don't disagree there are differences in bearing manufacturers. But there's something fishy here. There is no way a caged ball bearing will spin freely for that long no matter what the quality. The only time I have seen bearings spin like that is when they are worn, perfectly clean, and had compressed air on them.

Think about it; did you try this on your new front or rear wheel bearings? Did they spin at all?

Posted by: mepstein Nov 18 2020, 08:03 AM

when you took the rubber seal out of a Swiss bearing, they spun that long. They also came with a special lube.

Posted by: altitude411 Nov 18 2020, 08:21 AM

Wheel bearing aren't high precession bearings. They are greased and have sealing rings in place. High precession bearings are for very high speed industrial machines built to high tolerances. They aren't prone to shock or exposed to the elements. Here are some of ABEC allowed tolerances of bearing ratings.


ABEC 5: 0.0035 mm (0.000138")
ABEC 7: 0.0025 mm (0.000098")
ABEC 9: 0.0012 mm (0.000047")

Posted by: rhodyguy Nov 18 2020, 02:12 PM

What is the application of those bearings?

Posted by: sixnotfour Nov 19 2020, 08:36 AM

my kid had ceramic ball skateboard bearings,,