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When is a cup/cone wore out?…(8 posts)

When is a cup/cone wore out?…TFerguson
Aug 26, 2003 1:31 PM
If you can see a ring on the cup or cone, does this mean they need to be replaced? Not pitting, just a wear ring. Any ring? ½ mm ring?

Depends on your threshold of wornoutnesscory
Aug 26, 2003 3:17 PM
Just a visible ring shouldn't be a problem. If it's a gouge you can put a fingernail in, you need new ones. As a practical matater, though, I've clamped the axle in a power drill with the cup or cone on it and used fine sandpaper to smooth out gouges while it spins. Worked fine.
(I'm not saying that's a GOOD idea, but it was what was available at the time).
No, when the cone gets pits, replace it.MR_GRUMPY
Aug 26, 2003 4:50 PM
When the cups gets pits, it's new hub time.
Any shop, worth its salt, can get new cones from Qualty Bicycle Products.
I read somewhere ...edmundtan
Aug 26, 2003 8:28 PM
that you can refinish the bearing surfaces. Use lapping compund instead of grease and assemble the hub, then ride aound for 10 minutes or so.

Pull the hubs apart, clean thoroughly and reassemble with new ball bearings and proper grease.

Interesting, but i've not tried it :-)
What is lapping compound? (nm)TFerguson
Aug 27, 2003 5:26 AM
There are different types, but in general...PsyDoc
Aug 27, 2003 6:34 AM
lapping compound is an abrasive (e.g., some use diamond powder, silicon carbide, etc.). If you are going to try something like the above poster mentioned, I would first try it on a hub you could do without in case something goes wrong.
LOLoff roadie
Aug 27, 2003 9:10 AM
"I would try it first on a hub you could do without..."

Understaement of the year- mixing abrasives and hubs is something I'd say falls squarely in the "experimental" camp for most folks. I'm guessing it wouln't be needed if the hubs were still servicable...

I'm not saying it would not work, or at least SEEM to work (smooth out ride quality in short term). But somehow the idea seems wrong. Do you really want to create a LARGER "contact patch" between the balls and the races?
The path to nowhereKerry Irons
Aug 27, 2003 4:35 PM
Cups and cones have hardened surfaces. Once they have pitted, the hardened surface is gone (like chipping the enamel off a tooth - soft stuff underneath). You could refinish the surface to smoothness, but it wouldn't last. Pitted cups/cones are done for.