Bearings > Wheel Bearings
We only sell premium motor-grade wheel bearings made from
hardened SAE 52100 high carbon chromium steel. Their dimensional accuracy is 0.01mm
or better and they are rated for rotational speeds up to 20,000 RPM.
Bearings of this quality level are usually not required for use as wheel bearings,
however, they will run smoother and outlast ordinary wheel bearings which
are made from inferior quality materials and lower standards of accuracy.
Wheel Bearing Information
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.
Bearing Installation: Wheel bearings can be carefully and evenly tapped
into the wheel hub using a block of wood and a hammer. A shop press or homemade
wheel bearing press may also be used to install wheel bearings into the hub.
Wheel Bearing Press for installing sealed bearings into aluminum electric
scooter and electric bike wheels can be made from the following materials which
are available at all hardware stores and home improvement centers:
1 Quantity - 10" long
x 3/8" diameter machine bolt
4 Quantity - 3/8" fender washers (must be larger than the bearing being pressed)
1 Quantity - 3/8" nut
Place two fender washers onto the end of the bolt
and insert the bolt between the two bearings, spacer, and wheel hub. Place two fender washers
and the nut on the end of the bolt and tighten the
nut and bolt together with two wrenches to carefully press the wheel bearings into
place. Care needs to be taken so that the wheel bearings are
started out perfectly straight and not at an angle to the hub. Tighten the
bearing press until the fender washers are pressed flush against the ends of the
wheel hub to properly seat the bearings.
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