A vehicular exterior rearview mirror system comprises a reflective element assembly, a base frame coupling the reflective element assembly to a vehicle, a support arm for coupling the reflective element assembly to the base frame, and a pivot connection for pivotally coupling the support arm to one of the base frame and the reflective element assembly. The pivot connection comprises a pedestal having at least two detent ribs, and an opening for receipt of the pedestal therethrough having at least two detent channels. Pivoting of one of the support arm relative to the base frame and the reflective element assembly relative to the support arm moves a first one of the at least two detent ribs out of a first one of the at least two detent channels and into a second one of the at least two detent channels.