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Often when you move a bike around you may feel kind of a deep clunking sound, things
aren't tight so perhaps something is really loose on the bike. You may want to check what
that is. First obviously check that the wheels are properly fixed to the frame, quick release
or tighten all the obvious things that could be loose are tight. You are still hearing
it especially in the front of the bike, you obviously have one of the bearings surfaces
is loose. Most bikes have, I think we are talking about five major bearings surfaces,
at least four. One is the headset bearing, which is what the fourth turns on. You have
your two hub bearings, obviously what the wheel spins on right here. The bottom bracket
bearing, which is what the crank set revolves on or crank arm revolves on. You have your
front hub and rear hub. Bottom bracket and headset. So those are the four major bearing
surfaces on a bike and they need to be in proper adjustment, not too loose obviously
because that is where the clunking noise come from. Too tight means they are going to bind
and prematurely wear out.