ABEC-5 rated 608ZZ (608Z) shielded wheel bearings. Made of carbon steel, these bearings can rotate up to 34,000 rpm. Bearings are closed with metal shields to protect the bearing from dust or any possible contamination and are self lubricated (bearings are already greased).
608ZZ bearings are one of the most widely-used bearing sizes and are used in many scooters, skateboards, roller skates, and inline skates.
This is a popular size of bearing used by Razor Scooters USA on their electric and kick scooter lineup, as well as the new kick scooter lineup from Yvolution.
608 size bearings are also known in the skateboarding world as ABEC-5 bearings.
Note that one set is required for each wheel.
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Diameter (Outer): 22 mm Diameter (Inner): 8 mm Width: 7 mm Precision Rating: ABEC-5