The invention relates to a spring tensioning device (1) for mounting and/or removing helical compression springs on/from spring damper struts (57) for motor vehicles. The spring tensioning device (1) can be fixedly arranged as a stationary device outside the motor vehicle and has means that can engage at least partially in the helical compression spring and can be moved via a drive means. According to the invention a profiled rail (2) is provided, into which a portable spring tensioning apparatus (4) can be inserted and can be used as drive means for the spring tensioning device (1).