Skateboard trucks are the metal braces that connect the wheels to the deck and can be tightened or loosened with either a skate tool or a spanner. Loose trucks turn with less effort, while tighter trucks require more weight to pivot the board around. Having multiple trucks allows you to play with the height of your board, which may help with tricks and turning—the higher your trucks, the more sharply you can turn, while lower trucks make flip tricks easier.