Question: are nike shoe sizes bigger than adidas?
Answer: Adidas runs bigger than Nike by up to 5 millimeters. The same size on Nike tallies up to 9.62 inches, about a millimeter smaller. The disparity is more evident with half sizes. A women's 6.5 translates to 9.12 inches on Nike and 9.2 inches on Adidas, which is a fairly big gap.