Slalom freestyle performing tricks while skating along a straight line of uniformly spaced cones is known as inline skating. Although some utilise quad skates, most freestylers skate on inline skates. Cones are lined up and spaced equally. In competitions, lines are typically spaced 80 centimetres (31 inches) apart, while larger tournaments may also employ lines that are 50 centimetres (20 inches) apart or 120 centimetres (47 inches) apart. One wheel can be bigger than the others when the inline wheels are set up in a rocker configuration.