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Correct Ball Bearing Size for Front Hub HB-HF08

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Correct Ball Bearing Size for Front Hub HB-HF08

Old 01-30-17, 12:20 AM
  #1  
Donnie Johnson
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Correct Ball Bearing Size for Front Hub HB-HF08

Howdy,

I've just cleaned, regressed and replaced the front bearings in the hub of a older (2002/4) tandem wheel.

I think the hub model is HB HF08. The front hub has no model stamped on it however the rear hub is a Shimano FH-HF08 and the front is very similar.

The front hub had 9 x 1/4 inch bearings so I replaced them with the equivalent. Both the cups and cones appeared to be in good working order (no obvious pitting) however once resembled the wheel seem to be rolling roughly. If I back up the adjustment the wheel rolls smoothly however there is more play than usual. After rebuilding, I tried to find the Shimano Tech Document for this hub to confirm correct bearing size however I can only find a newer version and this specifies 10 x 3/16 sized bearings.

Could someone help to confirm what the correct bearing size is for this hub, 1/4 or 3/16.

Also, is it normal for there to be some some roughness in an older wheelset and is loosing the bearing compression a suitable solution, or should I strip the hub again and check that there is no obvious problem. I'm reasonably confident that the hub is adequately clean.

Thanks kindly

DJ
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Old 01-30-17, 12:25 AM
  #2  
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Tech drawing for an HB HF08 shows the "standard" 10 ea. 3/16" balls per side.
IF the hubs were different, they would have a "later" model#

I don't have a clue how you consider the front & rear hubs similar?
Like the FH Body to mount cogs....

Last edited by Bill Kapaun; 01-30-17 at 12:33 AM.
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Old 01-30-17, 02:07 AM
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Originally Posted by Bill Kapaun View Post
Tech drawing for an HB HF08 shows the "standard" 10 ea. 3/16" balls per side.
IF the hubs were different, they would have a "later" model#

I don't have a clue how you consider the front & rear hubs similar?
Like the FH Body to mount cogs....
Hi Bill,

Thanks for pointing out that the hub on my front wheel is different to the hub on my rear wheel.
As stated in my original post, the front hub has no model stamped on it so I cannot exactly identify the make and model. This makes finding the correct tech drawing difficult. I was simply drawing the conclusion that the both hubs have 40 spokes, the flange diameters are similar, both have axel and bearing components that are consistent with other Shimano hub and axel assemblies, they are built into the same Rhyolite rims with spokes of the same diameter. I assume that the hubs are from the same series however it is entirely possible that my assumption is incorrect.

The front hub is similar yet different the attached tech drawing. Specific differences are the external rubber dust covers and as identified by item 2 in the item list, and the fact that the hubs had inch bearings installed and the drawing specifies 3/16 inch bearings. The attached hyperlink of the hub appears to be of the same hub but perhaps a modern model remembering these wheels are potentially 15 years old.

https://www.paul-lange.de/tradepro/s...NO/HB-HF08.pdf

Perhaps you can send through the tech drawing they you refer to if it is different to the one attached.
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Old 01-30-17, 02:33 AM
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Maybe just reassemble the hub with 3/16" bearings and see how it works.
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Old 01-30-17, 02:45 AM
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Sounds like an easy solution. I will rebuild them tomorrow with the 3/16 bearings. Is did seem unusual that the fronts had bigger bearings than other shimano hubs.

In saying that, the wheels were built for heavy duty work, loaded cycle touring and MTB riding on a tandem. I was unsure sure if larger bearings are used considering the larger loads.
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Old 01-30-17, 07:34 AM
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An HB-HF08 is an HB-HF08 is an HB-HF08......

The only time I've seen 9 1/4" balls in a front was on a cheap Huffy.
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Old 01-30-17, 08:05 AM
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Originally Posted by AnkleWork View Post
Maybe just reassemble the hub with 3/16" bearings and see how it works.
+1 I've never seen a Shimano front hub that required anything but either 10 or 11 x 3/16"bearing balls per side.
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Old 01-30-17, 02:36 PM
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10 3/16" balls on each side, no matter the load.
If you search the web you can find that a single radial bearing of a similar size is capable of supporting a few hundred pounds.
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Old 01-30-17, 05:12 PM
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I have tried to rebuilt with 3/16 bearings. There is sufficient space for 13 bearings however they do not fit the cones. The contact diameter of the bearings exceeds the contact diameter of the cone. I will attempt to upload a photo.

Has anyone got a spec sheet for HB HF07 or earlier generations as the HB HF08 does not have the correct components. I cannot find a copy on the internet.

Perhaps this hub is not a shimano hub. Any ideas on how to identify if this is the case?

Last edited by Donnie Johnson; 01-30-17 at 05:46 PM.
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Old 01-30-17, 05:47 PM
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Originally Posted by Donnie Johnson View Post
I have just rebuilt with 3/16 bearings. There is sufficient space for 13 bearings however they do not fit the cones.
The fact you can cram 13 balls in doesn't mean that the right number. Shimano front hubs use either 10 or 11 balls/side.
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Old 01-30-17, 05:48 PM
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The 1/4 bearings fit the best so I have reused them, this time with a little less grease and the wheel rotates significantly smoother.

Problem solved.
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Old 01-30-17, 05:56 PM
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IF it's a Shimano hub, I can't imagine it NOT saying Shimano with a model#.
You obviously have a different brand hub.
As to identification? What are we looking at? All I see is thin air

Possibly somebody cannibalized parts from more than 1 hub to make a wheel that "kinda worked"?
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Old 01-30-17, 06:01 PM
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Originally Posted by HillRider View Post
The fact you can cram 13 balls in doesn't mean that the right number. Shimano front hubs use either 10 or 11 balls/side.
Hi Hillrider,

I take your advice and tried the 3/16. I didn't have to try to cram them in. There was more than ample space. In fact, when there was 10 x 3/16 bearings positioned cup, the approximately 12 mm gap between the bearings.

I measured the cup diameter of a more modern front shimano hub with vernier calipers that used 3/16 and the and outer diameter was 22mm. The hubs in question have an outer cup diameter of 28 mm. There is a significant difference in cup size.
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10 x 3.16th.JPG (35.9 KB, 29 views)

Last edited by Donnie Johnson; 01-30-17 at 06:13 PM.
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Old 01-30-17, 06:06 PM
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9 x 1/4
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Old 01-30-17, 06:11 PM
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Originally Posted by Bill Kapaun View Post
IF it's a Shimano hub, I can't imagine it NOT saying Shimano with a model#.
You obviously have a different brand hub.
As to identification? What are we looking at? All I see is thin air

Possibly somebody cannibalized parts from more than 1 hub to make a wheel that "kinda worked"?
I cannot imagine Shimano not having an identifying marker either. One way or another, it doesn't matter to me what the branding is, just as long as it does what its suppose to. Identifying the hub is necessary as at some point in the future I may need to replace other components.
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Old 01-30-17, 06:12 PM
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Whole Wheel
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Old 01-30-17, 06:25 PM
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Originally Posted by Donnie Johnson View Post
9 x 1/4
Well, that certainly looks right but it almost equally certainly isn't a Shimano hub.
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Old 01-30-17, 06:31 PM
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Originally Posted by HillRider View Post
Well, that certainly looks right but it almost equally certainly isn't a Shimano hub.
Ok and thanks for the confirmation, any ideas of a company that might have made a 40 spoke hub that is likely to be used on a tandem.

I'll email KHS (Tandemis a KHS Tandemania Comp) and see if they can shed some light on the hub.
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