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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.

Bearing Installation: A bearing press or similar pressing tool should be used to exert the force needed to press the bearing into the wheels hub.

A Homemade 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- 8" long x 3/8" diameter bolt

4- 3/8" fender washers (must be larger than the bearing being pressed)

1- 3/8" nut

To use this tool place two fender washers onto the end of the bolt and insert the bolt between the two bearings and the hub. Then place two fender washers and the nut on the end of the bolt and tighten the nut and bolt together to carefully press the bearings into place. Care needs to be taken so that the 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.