Core types:
- Hub: Hard Plastic ring, just enough to connect the urethane and hold the bearings in place. It's the most common type of core. Hub wheels last the longest because you have more urethane to slide with
- Closed-core:  Hard plastic part between the bearings and the urethane. Saves weight in comparison to a hub core wheel and reduces friction during slides.
- Open-core: Hard plastic spokes between the bearings and the urethane to save even more weight in comparison to a closed core. Most common with the bigger 75 mm plus wheels.
Core positions:
- Centerset: The core is exactly in the middle. It allows for the wheels to be flipped. This is the most common type of skateboard wheel. Ceterset has the most grip
- Offset: The core is closer to the inner side of the wheel. These wheels are more common with longboarding because it offers a nice balance of grip and slide
- Sideset:  The core is on the inside of the wheel. This type of wheel slides the easiest. The disadvantage is that they wear out much faster