A flange bearing is a pre-assembled unit comprising a rolling-element bearing (e.g., deep groove ball bearing) housed in a flanged mount, enabling direct surface attachment via bolts.
99502HNR Go-Karts Wheel Bearings

Snap ring in groove on outer ring for axial location of bearing
Bearings Rubber Sealed, Small friction and high-limit speed, Ball Bearings are cost-effective and require little maintenance
Double seal on both sides of the bearing effectively saves grease, extending the life of machine, prevent impurities from entering.
Moreover, the outer snap ring can be easily taken off (to be 1623RS) if your application doesn't require it
Precise and versatile bearings, suitable for high speed and quiet occasions.
Widely used in vehicles like Go Kart, micro Bike and Lawn Mowers.
Widely used in conveyors, agricultural machinery, it simplifies installation.