A synchronizing device of a transmission is provided with a cylindrical synchronizer body having an external toothing. A shifting sleeve includes, but is not limited to an internal toothing. The internal toothing axially displaceably meshes with the external tooting of the synchronizer body. A synchronizing ring includes, but is not limited to a locking gear rim. In clearances distributed on the circumference of the synchronizer body, pre-synchronizing elements are arranged. The pre-synchronizing elements are in spring-elastic engagement with the shifting sleeve and are arrested by the shifting sleeve in a middle position. A face end of the locking gear rim includes, but is not limited to outward bulges in direction of the pre-synchronizing elements subject to the setting of spacing between synchronizing ring and pre-synchronizing elements.