a skateboard truck assembly with an integrated combination of a system of gears that resemble planetary gears that allow both wheels and a caster to remain on the ground while the skateboard is traveling in a lengthwise manner . at the same time , when the rider leans to one side or the other of the skateboard , the gear assembly causes the “ downhill ” wheel to rise in the air and the caster to be displaced such that the skateboarder can laterally “ slide ” or “ drift ” the skateboard as though it was a snowboard . because the downhill wheel is raised well above the ground , there is less of a tendency for the downhill wheel to catch on any street irregularities or rocks and stop sliding at inopportune times .