Steve Christini's first all-wheel-drive bike—his senior mechanical engineering project from Villanova—hangs near the main entrance ofChristini's shop in downtown Philadelphia. That first bike used a series of chains, shafts, and pinions to transfer power to a suspended, steerable front wheel. His latest two-wheelers—a line of all-wheel-drive off-road racing motorcycles—get power to their front wheels in much the same way. But rather than being prototypes hanging on the wall, they are competing on the world stage at venues like the X Games' Enduro X and Erzbergrodeo enduro.
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