a variable speed belt drive bearing assembly including an enclosed helical ramp assembly or torque sensing helix which is mounted on the driven or secondary clutch . the helix includes a plurality of ramps that include both an upper bearing surface and a lower bearing surface . this arrangement ensures that the torque transferring roller or button is always in contact with either one or both of the surfaces . the cover of the driving or primary clutch assembly includes an enlarged opening to permit the mounting of a sleeve which slides over the engine clutch shaft .