Try this before you print the bearing- https://www.thingiverse.com/thing:3569489
So you wanted to 3D print some wheels that can actually spin? Here you go ;) Just add tires :D
0% support required, print in place bearing. Watch video tutorial to get acquainted :D
UPDATE:
-Added tire STL
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Related Video-
https://youtu.be/vfpbPt3GXPQ
https://youtu.be/0yBch7DHt7k
The author marked this model as their own original creation. Imported from Thingiverse.