Q: My only fear with my
onyx hub is condensation getting inside. Will things rust inside? Can the condensation freeze and wreck stuff?
If it is starting to fail will it slip some to let me know it needs service or keep operating normally till everything grenades?
A: I watched an
Onyx crewmember assemble a Fat hub, while chatting with him, and he showed me that the hub has pretty aggressive labyrinth seals. He said that during durability testing they contaminated the hub on purpose and the superhard sprags and driver tended to just grind the sand, etc. into dust.
According to them, the sprags are specifically shaped on several distinct angles, so in the case of a very high level of torque (he didn't say a #, but that it was beyond what any human could generate) the sprags would attain an angle that would simply allow slip, the driver would rotate, and once torque input levels subsided - business would continue as usual. He described a failure test that applied an inordinately large number of repeated hi-impact applications of torque to the hub. Afterwards, as you might suspect, the bearings were toast as well as other bike components - but the sprags and driver were unaffected.
This pic is a bmx and a mtb hub. The Fat hub has two sets of sprags as the mtb hub does, whereas the bmx hub only gets one set.
There really doesn't look like much inside to get wrecked... The sprags themselves are recommended to get a very thin type of oil - no grease, and it looks like it'd be a doddle to flush the hub out if you were worried that it had become contaminated. I'm no expert, but if enough moisture got inside to freeze it seems like it would just prevent some of the sprags from engaging and the driver would have less success engaging. it might slip. Then if the hub came inside where it was warm, the moisture would thaw and presumably it would work appropriately again.
Сообщение от schizo
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