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that is what's left of the outer bearing on a dt240 freehub. just the inner and outer races remain. dust cover and ball bearings are nowhere to be found. my question; did singlespeeding cause this? was it overtightening the rear axle? I guess this is why I've been struggling to maintain chain tension. I may try to press new bearings into this freehub and save it but I've already ordered a replacement with a new end cap. Just wondering if anyone has seen failures like this, thanks!
 

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Do you know what kind of mileage the freehub had on it?

I have trouble wearing out these bearings at all, nevermind like you have here! I HAVE worn out the endcaps before (specifically the o-ring that holds everything together). Once that o-ring starts to go I could see contamination pick up and spiral from there maybe?
 

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psycho cyclo addict
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The bearings in DT hubs may be negatively impacted/stressed if you over tighten the skewer/axle/bolts in the dropout.

I generally tighten just enough to keep it from rattling loose.
 

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Wanna ride bikes?
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What frame is this used in? If the rear wheel is slipping you may be over tightening the hub to try to correct it. Is there a tension adjustment screw on the dropout, or is it sliders? Got a pic?
 
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