Abstract: In an exemplary embodiment a mechanism for providing a gear mechanism having neutral, forward and reverse gear states for a Trike. The operation of the reverse gear mechanism is determined by its structure of conical gears affixed to shafts. The change of gear state is dependent upon causing, by a shifting device, engagement of certain conical gears resulting in certain rotational directions of shafts within the mechanism. In forward gear operation, as shown in FIG. 2, gear 2330 rotating in a counter-clockwise direction engages gear 2340, which is coupled to shaft 2430. Gear 2330 rotating counter-clockwise engages gear 2340 causing it to rotate counter-clockwise, which in turn causes shaft 2430 to rotate counter-clockwise or, by convention, in a forward direction. In reverse gear operation, as shown in FIG. 3, gear 3330 rotating in a counter-clockwise direction engages gear 3320, which is coupled to shaft 3410.