Replacing Wheel Bearings
original article by Richard Martens on 7 August, 2008
There comes a time in every rider’s life when they decide to either fix a bike on their own, or choose to modify their bike. While the professionals will tell you that you are always best off using them for these problems, both our wallets and our curiosity often propel us forward in search of greater understanding of the mechanical universe. In an effort to help you do it yourself several articles will be focused on various mechanical aspects of mountain biking.
What you will need for the following repair/modification
- Correctly sized wrenches.
- Bearing grease (this should be available at any bike store)
- Wheel bearings (most should come pre-assembled in the brace)
Step 1:
Using the correct size wrench remove the wheel from the frame. For front
wheels this will be simple, for some rear wheel set ups you may need to
remove the derailleur and brake system before removing the wheel.
Step 2:
Using the correct sized wrench remove the retaining nut that is against
the outside of the wheel well (where the axle goes through). At this point
some bikes may require a flat head screw driver to remove the wheel well
plate, while others will simply pull out. If necessary repeat this process
on the other side. You know you have done it correctly when the axle of
the wheel is completely removed.
Step 3:
Remove the wheel bearing brace. This will be a small circular piece of metal
with several ball bearings spaced apart. Also you should find at least some
grease to help reduce friction during movement.
Step 4:
After removing the replacement bearings from their package set them on a
cardboard box or similar surface you do not mind getting dirty. Then open
the wheel grease and scoop out a liberal amount with one hand. Next grab
the replacement bearing with you clean hand and begin rubbing the grease
into the bearing.
Step 5:
Continue rubbing wheel grease into the bearing for several minutes scooping
out more grease as needed. You want to make sure that as much of each ball
is coated in grease so that they will function correctly. Repeat this process
for the other bearing.
Step 6:
After wiping your hands clean of grease replace the bearings into the wheel
well. Most wheels should have groves that they align with, if they don’t,
put them in there as well as you can.
Step 7:
Replace the axel assembly and tighten all nuts as needed. Make sure to not
over tighten these nuts as doing so could cause problems down the road.
Step 8:
Remount wheel as specified by your particular bike manufacturer.
Step 9:
Take your bike for a ride, listen for any grinding sounds. Also you will
want to make sure that your pedaling is as smooth or smoother as it was
previously. If you hear either grinding or the pedaling is not smooth repeat
the process and apply more wheel grease as it is very likely you did not
coat the bearings well enough.
Step 10:
Enjoy the ride.
- copied from MTO Bikes' website - used with permission