The ridges should be matched to the locations of the sealed cartridge bearings in the hub (to provide support)
So, if the outside diam. of the tube matches the inner diam. of the hub it should still be all good, yeah?
Logic is sound but I think it'd all have to be a very precise fit (both the tube in the hub and the axle in the tube) to ensure everything was working as intended
@hippy started
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The ridges should be matched to the locations of the sealed cartridge bearings in the hub (to provide support)