•  The basic construction of the double cone synchronizer mechanism is the same as a triple cone synchronizer mechanism except that the inner side of the inner cone is not used as a friction surface.

•  The basic construction of the double cone synchronizer mechanism is the same as a triple cone synchronizer mechanism except that friction force is not generated because there is no contact surface between the inner cone and each gear.

•  For the double cone synchronizer mechanism operation, refer to the triple cone synchronizer mechanism. (See TRIPLE CONE SYNCHRONIZER MECHANISM OPERATION [S15M-D, S15MX-D].)