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Bearings > Wheel Bearings
Wheel Bearings
All of the wheel bearings listed on this page are premium motor-grade bearings made from
fully hardened SAE 52100 high carbon chromium steel. Their dimensional accuracy is 0.01mm
or better and they are rated for rotational speeds up to 6,000 RPM.
Bearings of this quality level are usually not required for use as wheel bearings,
however, they will outperform and outlast ordinary wheel bearings which
are made from inferior quality materials and have lower standards of dimensional accuracy.
Wheel Bearing Information
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Sealed
Wheel Bearing and Shielded Wheel Bearing
numbers are imprinted on both side covers of the bearing.
Sealed Wheel Bearing numbers end with RS or 2RS
and have plastic side covers which make a positive seal
to protect against dust and water intrusion. The side
covers may be removed for inspection and re-lubrication
and then reinstalled. Sealed wheel bearings typically
outlast shielded wheel bearings because their plastic
seals keeps out dirt and water.
Shielded Wheel Bearing numbers end with Z, ZZ,
or 2Z and have steel side covers which protect the bearing
against severe physical damage. Their steel side covers
do not make a positive seal though so they do not protect
the bearing against dust and water intrusion. If your
electric scooter or bike needs bearings and currently
has shielded wheel bearings you may want to consider
switching over to sealed wheel bearings for a longer
service life.numbers end with Z, ZZ, or
2Z and have steel side covers which protect the
bearing against severe physical damage. Their steel
side covers do not make a positive seal though so
they do not protect the bearing against dust and
water intrusion. If your electric scooter or bike
needs bearings and currently has shielded wheel
bearings you may want to consider switching over to
sealed wheel bearings for a longer service life.
Wheel Bearing Removal and Installation Guide
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Which Type of Bearings Should I Choose?
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Sealed Wheel Bearings have rubber sides which are attached
to the outer race and gently touch the inner race creating a seal that prevents
dust and moisture from entering the inside of the bearing. Rubber side bearings
have slightly higher rolling resistance than metal side bearings do with the
tradeoff being that they may last longer than metal side bearings.
Shielded Wheel Bearing have metal sides which are attached to
the outer race and come very close to the inner race but do not touch it. Metal
side bearings have a slightly lower rolling resistance than rubber side bearings
do with the tradeoff being that dust and moisture can enter the inside of the
bearing which
may cause it to fail earlier than rubber side bearings.
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Conversion Calculator
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