•  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 gear.

•  For the double-cone synchronizer mechanism operation, refer to the triple-cone synchronizer mechanism.