hen you lean to a side of a skateboard, it turns. The deck tilts and causes the trucks to pivot. The wheels on one side of the skateboard move closer together and the wheels on the other side move further apart. If you tilt the deck as far as it will go, and then extend a line through each axle and find where they cross, you have the minimum turning radius of your skateboard. The smaller the turning radius, the sharper turns you can make. For most types of skateboarding, a smaller turning radius is better (but too small can be dangerous). Many things determine this turning radius: truck geometry, wheel base, deck height, wheel size and shape, and so on.