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Hub repacking….(7 posts)

Hub repacking….TFerguson
Aug 10, 2002 9:13 AM
Whenever I remove the bearings from a hub and I'm not going to replace them, I keep the left and right separate. I figure that the manufacturer may have gone to the effort of using the same size within a tolerance or a least using the same lot of bearings for each side. Is this overkill?

Also, if the consensus is that this is absolutely necessary, should I also keep track of which side they came from and see that they get back there?

The worry basket.Spoke Wrench
Aug 10, 2002 11:10 AM
Each of us has a basket that we put all of our worries into. Everybody always manages to find just enough things to worry about to keep their basket full all of the time. I've always had enough other crap going on in my life that I've never thought about which side of the hub a bearing came from.
The worry basket.Rusty Coggs
Aug 10, 2002 2:30 PM
And if one wants to really do it right,throw the old ones in the recycle bin and use new ones........Lots less worry.And, NO, the manufactruers do not worry about lots/side of hub.
You can get 100 bearings for $2.90 from Loose Screws, so...Silverback
Aug 10, 2002 3:34 PM
...I just use new ones.
Total overkillKerry
Aug 10, 2002 3:37 PM
Hub bearings are bought in huge lots, and most manufacturers don't even worry that much about the tolerance, let alone selecting bearings hub by hub or side by side. Focus your energy on something worthwhile, like whirled peas.
Total overkilleddie m
Aug 11, 2002 9:22 AM
Actually, I think that the best hubs, like Campy Record, actually have matched ball bearings. The hardest part of manufacturing the balls is getting them to be the same size, so the best bearings have matched sets of balls of the same exact size. Campy even sold matched replacement sets but I haven't seen those in years. I always keep the balls in matched sets but I don't worry about which side they go back into. It doesn't cost anything and at least theoretically you will get longer bearing life and it will be easier to set the preload.
Campy bearingsKerry
Aug 11, 2002 12:52 PM
Campy has a long history of hand selecting their bearings. What this means is that they look over the actual testing results from bearing manufacturers, and select bearings that are within one micron of Campy's specified size. A given lot of bearings has a nominal size (say 1/4 inch), and actual size, and a degree of variation from that actual size. Commercially, about the best bearings you can get are referred to as Grade 10, that means they are within 10 microns of the nominal size. Campy's hand selection allows them to get the equivalent of 1 micron! Campy Record hubs now have caged sets of bearings, but this is a way to ease maintenance and reduce friction (bearings never touch each other) rather than to match the bearings. Bearings are sold in a "lot" which has thousands of bearings in it (depending on size). Campy does not go further and measure/select from within a lot. They pick lots that have the right specification (variation and size) in the first place.