Lower sidewall portions (18, 20) of a vehicle tire (10) are spread apart by a spreader tool (28). Spreader bars (32, 34) are placed between the spread apart lower sidewall portions (18, 20) of the tire (10). Concrete (116) is poured in place in the tire. One or more iron members (120, 122, 124, 126) are placed in the tire (10) with lower portions in the concrete (116) and upper portions extending towards the inner side of the tread wall (26). At least one other iron member (120, 122, 124, 126) is positioned in the tire (10) with a lower end portion in the concrete (126) and an upper portion sloping upwardly and outwardly towards the inner side of the tread wall (26) on a diametrically opposite portion of the tire (10).