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23-02.-2008, 01:35 AM
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#16 |
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Re: An easy way to tell if your bearings are worn out.
On Feb 22, 12:03*am, jobst.bra...@stanfordalumni.org wrote:
> Aside from all the noise over worn bearings, let's be clear about > this. *The only types of wear that affect bicycle ball bearings are > rust and spalling. * > > Riding ball bearings when wet will dry them out and leave fine rust > that causes intermittent and random sharp cracking sounds. *Such > bearings can be cleaned by wiping fine rust from the races and balls > with a clean cloth before re-installing and oiling them. *They will > work fine. > > Bearings that have rusted at rest from water are another matter > because that causes eroded rust grooves at the edge of the wet > meniscus. *The balls and probably their races are shot if this > condition developed over a few days. > > The most common failing is spalling, in which the highly polished > surface of bearing balls and even races, flake off much like a pot > hole in a repaved street in which the top layer of pavement cracked > and got displaced. *These are also shot. > > Other than that, bearing balls do not become oval or change their size > significantly without spalling. *Therefore, all the advice about oval > balls and undersized balls is imaginary. *If you were to watch bearing > balls in use, you would see that they spin about an ever changing > axis, causing uniform color and roundness. *They do not rotate about a > fixed axis as the ovality folks seem to visualize. > > Jobst Brandt chickens don't lay eggs unless you feed them therefore chickens don't lay eggs. |
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