Join Date: Nov 2000
Location: New Orleans, LA
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I suspect Matt and his LBS buddy are referring to "cartridge" bearings, which term many freely, if mistakenly, interchange with "sealed". My LBS also told me recently that Shimano doesn't make cartridge bearing hubs.
Matt, I think 9mm is pretty much the standard axle diameter. All of mine are, but then they are all road bikes. I believe you have to have a hub that is disc brake compatible. There is more to it than just the axle.
If it ain't broke, mess with it anyway!