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Inner Flange Impact:

The Inner Flange Impact Test simulates pot hole damage or that of hitting road debris.  This test has been in use in Europe for years and is specified in Ford’s ES 9U5A-1007-AA. 
A wheel with tire is attached to an apparatus that allows freedom of movement in the radial direction. Directly above the wheel a pointed striker is attached to a sled carrying a pre determined amount of weight. The weight sled and striker are released from a certain height and will fall on the rear half of the wheel causing the majority of the impact to hit the rear flange.
According to the GMW specification a wheel is mounted to a fixture on a non-movable base. The mass is then dropped onto the inner half of the wheel. A large spring is placed above the auxilary weight that comes into contact with the wheel.