Can you do tricks on 56 mm wheels?
Wheel Size for Bowls, Mini Ramps and Vert
Most skateboarders do just fine on 56 to 56 mm wheels in mini ramps, and even in medium bowls. via
What are anti-rocker wheels?
What is anti-rocker? The opposite of rocker - raising the middle two wheels (or in most cases, using smaller wheels in the middle spots). The purpose of anti-rocker wheels or 'grindwheels' is to assist a skater landing a trick onto the H-block. via