Hmmm... I suppose it depends on the details.
Cones, Cups, Races, Lock Nuts.... and all those little round thingies that fall out when one takes the hubs apart.

For the OP:
There is a Mechanics subform that is good for general mechanical issues.

Otherwise, first think if it is a general question or specific question. General questions can go here under General Cycling. Something specific to bike type (road, MTB, etc), or bike use (road, MTB, touring, commuting, utility, etc) can go under a more specific forum. Also Advocacy and Safety for safety issues, accidents, and etc. There are also regional subforums for more local issues or events.

If the discussion seems to out of place, someone will help move it for you.