 Weapons Grade Bearings, China vs Germany |
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| 914Sixer |
 Nov 17 2020, 06:36 PM
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#1
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914 Guru  Group: Members Posts: 8,877 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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I was not able to get the video so I took a screenshot of results of bearing testing. Found results to be interesting.
Attached thumbnail(s) 
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| altitude411 |
Nov 17 2020, 07:02 PM
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#2
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I drove my 6 into a tree Group: Members Posts: 1,306 Joined: 21-September 14 From: montana Member No.: 17,932 Region Association: Rocky Mountains
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Wow. Harbor freight vs Mercedes Benz... (IMG:style_emoticons/default/blink.gif)
https://www.youtube.com/watch?v=hFBhqSscTbI |
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| mepstein |
Nov 17 2020, 07:12 PM
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#3
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914-6 GT in waiting Group: Members Posts: 19,258 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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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.
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| fixer34 |
Nov 18 2020, 07:30 AM
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#4
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Senior Member Group: Members Posts: 1,085 Joined: 16-September 14 From: Chicago area Member No.: 17,908 Region Association: Upper MidWest
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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? |
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| mepstein |
Nov 18 2020, 08:03 AM
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#5
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914-6 GT in waiting Group: Members Posts: 19,258 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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when you took the rubber seal out of a Swiss bearing, they spun that long. They also came with a special lube.
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| altitude411 |
Nov 18 2020, 08:21 AM
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#6
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I drove my 6 into a tree Group: Members Posts: 1,306 Joined: 21-September 14 From: montana Member No.: 17,932 Region Association: Rocky Mountains
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QUOTE(fixer34 @ Nov 18 2020, 06:30 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? 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. (IMG:style_emoticons/default/beerchug.gif) ABEC 5: 0.0035 mm (0.000138") ABEC 7: 0.0025 mm (0.000098") ABEC 9: 0.0012 mm (0.000047") |
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| rhodyguy |
Nov 18 2020, 02:12 PM
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#7
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,075 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
What is the application of those bearings?
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| sixnotfour |
Nov 19 2020, 08:36 AM
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#8
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914 Wizard Group: Members Posts: 10,423 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains 
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my kid had ceramic ball skateboard bearings,,
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