A pulley for a continuously variable transmission comprising: a fixed sheave having an axis of rotation; a movable sheave axially movable relative to the fixed sheave; a spider axially fixed relative to the fixed sheave and rotationally fixed relative to the movable sheave, the movable sheave being disposed axially between the spider and the fixed sheave; a biasing member biasing the movable sheave axially away from the fixed sheave; at least one centrifugal actuator comprising an arm pivotally connected to one of the movable sheave and the spider, the arm pivoting away from the one of the movable sheave and the spider as a speed of rotation of the pulley increases; and at least one roller assembly comprising a roller rotationally connected to another one of the movable sheave and the spider; wherein the arm has a thrust portion pushing against another one of the movable sheave and the spider as the arm pivots away from the one of the movable sheave and the spider, thereby moving the movable sheave axially toward the fixed sheave, the arm having a first outer profile at the thrust portion; the roller has a track portion having a second outer profile complementary to the first outer profile, the roller receiving the thrust portion of the arm on the track portion such that the thrust portion of the arm remains in contact with the track portion of the roller; and characterized in that a cross section of the first outer profile of the thrust portion of the arm, taken along a first plane parallel to a pivot axis of the arm, being convex, a cross section of the second outer profile of the track portion of the roller, taken along a second plane containing a rotation axis of the roller, being concave; and the arm and the roller thereby transferring axial and rotational forces between the spider and the movable sheave. a fixed sheave having an axis of rotation; a movable sheave axially movable relative to the fixed sheave; a spider axially fixed relative to the fixed sheave and rotationally fixed relative to the movable sheave, the movable sheave being disposed axially between the spider and the fixed sheave; a biasing member biasing the movable sheave axially away from the fixed sheave; at least one centrifugal actuator comprising an arm pivotally connected to one of the movable sheave and the spider, the arm pivoting away from the one of the movable sheave and the spider as a speed of rotation of the pulley increases; and at least one roller assembly comprising a roller rotationally connected to another one of the movable sheave and the spider; wherein the arm has a thrust portion pushing against another one of the movable sheave and the spider as the arm pivots away from the one of the movable sheave and the spider, thereby moving the movable sheave axially toward the fixed sheave, the arm having a first outer profile at the thrust portion; the roller has a track portion having a second outer profile complementary to the first outer profile, the roller receiving the thrust portion of the arm on the track portion such that the thrust portion of the arm remains in contact with the track portion of the roller; and characterized in that a cross section of the first outer profile of the thrust portion of the arm, taken along a first plane parallel to a pivot axis of the arm, being convex, a cross section of the second outer profile of the track portion of the roller, taken along a second plane containing a rotation axis of the roller, being concave; and the arm and the roller thereby transferring axial and rotational forces between the spider and the movable sheave. the arm has a thrust portion pushing against another one of the movable sheave and the spider as the arm pivots away from the one of the movable sheave and the spider, thereby moving the movable sheave axially toward the fixed sheave, the arm having a first outer profile at the thrust portion; the roller has a track portion having a second outer profile complementary to the first outer profile, the roller receiving the thrust portion of the arm on the track portion such that the thrust portion of the arm remains in contact with the track portion of the roller; and characterized in that a cross section of the first outer profile of the thrust portion of the arm, taken along a first plane parallel to a pivot axis of the arm, being convex, a cross section of the second outer profile of the track portion of the roller, taken along a second plane containing a rotation axis of the roller, being concave; and the arm and the roller thereby transferring axial and rotational forces between the spider and the movable sheave.