Attaching wheels to motors

Hello, I want to attach a 20mm hub wheel to a DC motor with a shaft of 8 mm. Could someone tell me the best way of doing this?
The specific wheels I am using are these:


It looks like there is a roller bearing inside can you confirm that with the one you have ?

Honestly I can’t think of a simply solution for that, it does not look like this wheel is meant to be attached to a DC motor through a hub.

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Thanks for your reply. Yes, they do have roller bearing inside. I decided to use a keyless locking assembly such as this one:

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Nice, let me know how it turned out.

If you have any pictures or video of the project, would be interested to see it.