I was trying to make a tire for a car that I'm modelling but every time I add count on the array mod the tire gets bigger.
How do I fix this and what did I do wrong?
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Your setup is a bit messy, try to put the origins of each object at their geometry, apply the rotations, put the curve and the object at the same position, etc.
A quick fix is to flatten your curve called BezierCurve on the Z axis, you can do it in Object mode and in that case apply the rotation: