Modelling a tyre tread using array modifier

You need to check your scale & rotation have been applied. Also, you may need to alter the position / rotation in edit mode for your tread to get the desired effect.

Select your tread and add an array modifier…if you select the center edge loop on your tire you can duplicate it leaving in place and separate it from the rest of the mesh…in object mode convert to curve.
In modifier panel add a curve modifier and under Object select the new curve you just made… the tread should now flow nicely around your tire…

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