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The rear hub on a bike can be loose. You want to check it just as we did the front by moving
it side to side. If you detect some play or the fact that it's not rolling very easily
you would again take it off the bike, grab the lock nuts, as we did the front, move them
side to side, if you can detect some play, it needs an adjustment. And the same as the
front, it requires a cone wrench and an open end wrench, you know a pair of cone wrenches
is usually a good one. At least one open end wrench for the lock nut. More importantly
to properly overhaul, or adjust the rear hub, you do need a tool to remove the free wheel,
so you can get at actually the cone surface on one side. Very often rear hubs are loose
and the lock nut and cone that need to be addressed are actually behind the free wheel
so this actually has to be removed with a special tool, a free wheel tool and a large
wrench or a bench vice to take this off the bike and then you can make a good adjustment
and then put the free wheel back on. In the case of more modern hubs that utilize a cassette,
you actually have to disassemble the cone and lock nut on this side enough to expose
the tool surfaces on the drive side. Make sure they're properly tight, push it back
in and make your adjustment on the non-drive side. Again, these are operations that do
require some practice and the proper tools and I do recommend you take it to a shop and
have it done if you haven't done it yourself or have a hub you can practice on and not
your best stuff.