They both have the ABS sensor ring (the smaller ring). The one on the left, since it says ABS, will have the proper sensor and software to detect and control the ABS system. It may be hidden behind the brakes. The one on the right probably does not have the ABS system installed. As far as I know we did not get any DT 300 with ABS in North America. Europe gets all the good stuff. Hope this is the correct answers.