In his September, 1980 American Journal of Orthodontics article, SPEED inventor Dr. G. H. Hanson presented this case in which one activation resulted in 29 degrees of premolar rotation, more than half of which was attributable to the action of the SPEED bracket. Notice that the bicuspid not only rotates but translates.
Although these first generation SPEED brackets did not have the "escape-proof" feature, they provide dramatic evidence of their ability to rotate teeth.