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#713816 - 11/04/17 2:01 pm Main bearings again  
Joined: Sep 2008
Posts: 531
Stein Roger Online content
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Stein Roger  Online Content
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Skudeneshavn Norway
Having followed the ball vs roller main bearing debate with interest, I'd like to ask those in the know about 7 vs 8 balls imperial size ones. I tend to hang on to used bearings for some reason, two of the ball main bearings in my treasure trove sports 8 balls. The bearings supplied by my dealer always have 7. They seem to wear well enough, but do the 8 ball variety have a higher load rating? Are they available today?

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#713935 - 11/05/17 4:45 pm Re: Main bearings again [Re: Stein Roger]  
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Stein Roger Online content
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Stein Roger  Online Content
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Skudeneshavn Norway
Since there aren't any takers on this one, I'll answer it myself. CBS, where were you? grin

https://www.classicbritishspares.co...t-70-1591-rhp-mj1-1-8jc3-500-650-uk-made

#713957 - 11/05/17 7:59 pm Re: Main bearings again [Re: Stein Roger]  
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Adam M. Online content
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8 ball bearing has a higher load rating than 7 ball bearing.

#713978 - 11/05/17 10:21 pm Re: Main bearings again [Re: Stein Roger]  
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Thanks Adam, that answered the other question. I'd consider the question in itself kind of rhetorical, but it's nice to get confirmation.

#714044 - 11/06/17 3:42 pm Re: Main bearings again [Re: Stein Roger]  
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C.B.S Online content
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It also depends on the ball bearing size. I'm not sure if I seen a ball bearing with 7 balls for a unit 650 application. What brand bearing do you have with 7 balls?

#714171 - 11/07/17 11:46 am Re: Main bearings again [Re: Stein Roger]  
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Stein Roger Online content
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Skudeneshavn Norway
Had a quick look in my bearings drawer and the 7 ball variety are Skefko, Hoffman, SKF, Fafnir, NSK and FBC.
8 ball bearings are RHP, R&M and FAG. All came out of Triumph engines. Most are marked with 3 dots, some not marked at all. I presume unmarked are CN?

8 balls will have more contact points at any given time, thus an increased load rating. The balls are smaller too, which means less difference between inner and outer track diameter, and therefore less skidding motion between balls and tracks. As I understand it this should give less wear at higher rpm, and therefore a higher rpm rating. Is this correct?

I'll make sure to specify RHP mains next time I order. Sometimes more IS better.

#714172 - 11/07/17 11:53 am Re: Main bearings again [Re: Stein Roger]  
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kommando Online content
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A higher speed rating does not a mean higher load rating so it depends on your riding style, if you are after higher load rating then go for the roller.

#714188 - 11/07/17 3:49 pm Re: Main bearings again [Re: Stein Roger]  
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C.B.S Online content
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If you use a bearing with 7 rollers or 8 rollers on a standard road unit 650 you will be fine. Don't over think it

#714718 - 11/12/17 10:02 am Re: Main bearings again [Re: C.B.S]  
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Stein Roger Online content
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Stein Roger  Online Content
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Skudeneshavn Norway
I can assure you I don’t. Curious that’s all.

But thanks.


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