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need to replace the bottom
Tried squirting in a bit of solvent and giving it a spin for a bit? Done this on headsets with great success a couple of times when replacement either wasn't an option or would take a while... Due to the typically slight oscillation rather than spinning, they tend to build up hard crud in the races between the balls which feels for all the world like a pitted cone.
I'd go so far as to say that on non-BSOs, this is probably more often the case than actual pitting.
I've got a Cane Creek 40/56 headset the upper bearing is smooth but need to replace the bottom. Do the bearings pop out of the cup so I can just get a bearing kit or is the bearing fixed in place requiring a complete lower assembly?
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