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Roller bearings are constructed almost the same way as ball bearings,
but they have cylindrical shaped bearings instead of spherical shaped
bearings. This gives them a greater load bearing area. They are used
in wheel bearing applications. They consist of: 1. an inner "race"
which is a hardened ring that is slightly tapered on the outside and
2. an outer race, a hardened ring that is slightly tapered on the
inside and 3. a set of rollers contained in a cage. These bearings
must not be crushed together, (the angle of assembly drives them
together) creating friction if they are tightened too far. Roller
bearings need to be repacked periodically with fresh grease to insure
a long life.
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