There are many different scooter bearings that have the potential to wear out and will need to be replaced. Wheel bearings commonly need to be replaced, especially if the scooter is used heavily. Wrist pin bearing eventually go bad, as do fork bearings.

Set of 2 6001ZZ shielded wheel bearings for gas and electric scooters. The 6001ZZ wheel bearing is commonly used for 250w and 350w electric scooters, gas skateboards, and many others. The number 6001ZZ is etched on the side of each bearing. 12mm inside diameter, 28mm outside diameter, 8mm thickness.