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Sheared free hub


maidenmole

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Posted

post-30044-1454782213,2082.jpgpost-30044-1454782234,1021.jpg

 

Hubbers, any idea why this happened?

 

My LBS have never seen it happen before, the Powertap guys say it's due to strain from marginally too big bearing being inserted by my LBS.

 

I've wondered if the cassette cap may have been over tightened (even though it requires 40NM), causing stress and then a crack.

 

The free hub is about 2/3yrs old. So maybe just geriatric issues?

post-30044-1454782094,5117.jpg

Posted

"My LBS have never seen it happen before, the Powertap guys say it's due to strain from marginally too big bearing being inserted by my LBS

I've wondered if the cassette cap may have been over tightened (even though it requires 40NM), causing stress and then a crack." 

 

Ha ha. That is a new one.

Getting a marginally too big bearing in there. 

http://www.bearingworks.com/bearing_sizes/index.php

 

As you can see from these size charts the outer diameter of bearings go up in millimetres.

One size up from common bearings like the 6802 and 6902 have an outer diameter of 2 millimetres bigger. Anyone who has ever installed a bearing will tell you it will be impossible.

Posted

Can I borrow your legs!!! :whistling:   On a serious note I have never seen or herd of anything like that and I've been around a few bike shops. The bearing could be an issue but would have to know the proper size and the size of the one fitted my the LBS.

Posted

"I've wondered if the cassette cap may have been over tightened (even though it requires 40NM), causing stress and then a crack."

 

The tightening or loosening process maybe

But that will take a helluva strongarm

Posted

"My LBS have never seen it happen before, the Powertap guys say it's due to strain from marginally too big bearing being inserted by my LBS

 

I've wondered if the cassette cap may have been over tightened (even though it requires 40NM), causing stress and then a crack." 

 

Ha ha. That is a new one.

Getting a marginally too big bearing in there. 

http://www.bearingworks.com/bearing_sizes/index.php

 

As you can see from these size charts the outer diameter of bearings go up in millimetres.

One size up from common bearings like the 6802 and 6902 have an outer diameter of 2 millimetres bigger. Anyone who has ever installed a bearing will tell you it will be impossible.

 

 

110% agreed. Why do Distributors think they can get away with BS excuses??!!

The failure appears to be more due to the thread perhaps cut to deep cos it failed on the end of the thread. Manufacturing r material defect by the looks of it. Should be a straight warranty.

Posted

What make freehub. The freehub body is placed under tension by the cassette lockring and the point where if failed is weak because both the bearing socket and the lockring thread end nearby, possibly concentrating stress.

 

The last two gears on your cassette are loose with spacers and so when you use them, all the force is transmitted to the piece that broke rather than to the whole freewheel barrel.

 

To me it looks like a combination of poor design and possibly substandard materials and hard pedalling in the small gears. The bearing story is unadulterated BS. They blowing smoke to deflect responsibility

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