bicycle bearings
bicycle bearings
Author :Admin | Publish Date:2013-05-29 17:54:57
You asked for it, here you have it. Wheel bearings on a bicycle are an important part of bicycle
maintenance and by making sure that everything is well lubed in there, you can
avoid costly bicycle repair down the road. Well lubed bearings also provide an
easier ride.
The wheel bearings sit between a cone screwed to the wheel axle and the cup
in the wheel hub. They must be properly adjusted and greased. To find out if
everything is ok without taking everything apart, simply remove the wheel from
the bike and turn the axle with your fingers. Everything turns nice and smooth
without any play? Good, then you probably don't have to worry about anything. If
the axle is stuck, very hard to turn or is very loose, you have to regrease your
bearings propbably anyways. Here's how to:
You must get yourself some flat open wrenches, Park Tools makes good ones,
make sure they are in sizes 13mm and 15mm. Those are the most common sizes. You
won't get away using anything else for the nsk
bearing cones, so don't even try. Any kind of adjustable wrench will do for
the locking nut.
Put the flat wrench on the bearing cone between the hub and the locking
nut. Put the adjustable wrench on the locking nut. Hold the bearing cone in
place and unscrew the locking nut. The best position to do this is hunched over
the wheel while it sits on the ground. Whatever you do, DON'T open the cones at
all while in this position. Just unlock it so you can unscrew everything with
your fingers later.
Now this is the fast way to regrease your bearings by just shooting grease
in the bearings, screwing the cone back in, flipping the wheel over, hold the
cone of the bearing you've just greased, grab the axle now facing up, unscrew it
to reveal the other side bearings and pack them with grease. But the proper way
is by taking everything off, clean all the cones, hub cups, ntn bearings, repack with grease and reassemble. One great way
to pack grease in wheel axles is by using a small feeder syringe. Only undo one
side of the axle, this way you are sure that your axle is always centered when
you reassemble it.
Reassembly is done screwing in the bearing cone back into place, but not
too tight. Bearings should be able to roll smoothly without axle play. Tightened
the lock nut into place and check again. If you ever hear crunching noises while
turning the axle, dirt has gotten into your bearings and you should start all
over again. To avoid this, make sure you work in a clean place. If everything is
clean, you might have small pits in your bearing cones or cup. Your bearings
will be eaten away with time and it would be a good thing to replace
those.
In order to repack rear wheels, you have to remove the gear cogs on them.
In order to do this, you need a special socket to unscrew it. Check with your
local bike shop for the proper one. Their are a few models and types of [bicycle
bearings] . Coaster brake or inner speed hubs are almost bullet proof and
very rarely need regreasing. Those should be handled by a pro.
BRING SKF 6410 ( 50 X 130 X 31)
BRING SKF 6411 ( 55 X 140 X 33)
BRING SKF ALS 6 (3/4 X 1 7/8 X 9/16)
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