haha...
I think he created the pattern, then replicated it a certain amount of times, then used the bend modifier 360 degrees.
That is how I would have done it at least.
Or you can create the pattern, then create a cylinder that represents the wheel, then go back to the pattern, setup a centered rotation for its axes (By center I mean, center of the cylinder that represents the real wheel). Then simply rotate and duplicate the pattern how many times you want and at what ever degree's you want.
That's another way of doing it I guess.
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