Repair filler of wear groove in bottom bracket
08-23-09, 06:47 PM
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Repair filler of wear groove in bottom bracket
I had a bottom bracket bearing failure recently so picked up some replacement bearings.
I now notice after cleaning the cups to install the replacment bearings I have some slight recessed wear grooves in the cups, bigger on the non-drive side.
I remember some posters recently repairing wheel cones with some sort of filler-given the difficulty of removing BB cups and that this is a low end mountain bike, I thought I would give that a try if anyone recalls the filler.
These grooves don't exist on the BB cones, but I have a new set available anyway.
Anyone tried this with BB cups?
I now notice after cleaning the cups to install the replacment bearings I have some slight recessed wear grooves in the cups, bigger on the non-drive side.
I remember some posters recently repairing wheel cones with some sort of filler-given the difficulty of removing BB cups and that this is a low end mountain bike, I thought I would give that a try if anyone recalls the filler.
These grooves don't exist on the BB cones, but I have a new set available anyway.
Anyone tried this with BB cups?
08-23-09, 08:51 PM
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rebmeM roineS
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Not aware of any sort of filler that would work. New cups are in order. Or, old cups that are in good shape.
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08-23-09, 09:53 PM
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Most bearing surfaces are hardened steel, so that would make for some pretty stout filler.
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08-23-09, 10:39 PM
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As far as I know, there is no spread-on product that can be used to rebuild ball bearing races.\
Luckily, new bottom brackets are not too expensive (starting around $15 - $20), and worn ones can usually be put back together with some grease and readjusted to work well enough until you can find a suitable replacement... A worn or slightly wobbly bottom bracket is not a safety issue, and the only further damage is to the bottom bracket itself.
Luckily, new bottom brackets are not too expensive (starting around $15 - $20), and worn ones can usually be put back together with some grease and readjusted to work well enough until you can find a suitable replacement... A worn or slightly wobbly bottom bracket is not a safety issue, and the only further damage is to the bottom bracket itself.
08-24-09, 03:21 AM
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This is a 3-piece crank square-taper spindle with loose ball & cups? Send me some photos and your address and I'll COD you some new cups for cost of shipping ($4-7). I've easy got 150-200 of these BB cups & spindles around.
08-24-09, 03:33 AM
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I have "repaired" cups and cones by removing and then polishing with sand paper in a lathe chuck. It takes a while though. Start with course paper then move on to finer and finer paper until you are happy with the surface finish.
You can't beat DannoXYZ's offer though. New is best.
You can't beat DannoXYZ's offer though. New is best.
08-24-09, 11:06 AM
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The recessed groove might be mild enough so as to continue to be usable.
08-24-09, 11:09 AM
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I found the thread I had seen previously along with several others advocating the same thing to repair cones. The filler was Simichrome. The product looks like a decorative filler that cyclist have found effective at renewing worn parts.
