Fixed to the deck are two metal alloy trucks which
connect to the wheels. Some truck alloys contain
titanium for strength. The top part of the truck is called
the baseplate. It's screwed to the deck. The bottom part
is called the hanger. It's fixed to the wheels, which are
made of po$urethane. The hardness of the wheels
varies. Very hard wheels are good for performance but
not for rough surfaces. Between the baseplate and the
hanger are bushings which provide the spring
mechanism for turning the board.