Downhill - Whether you picked up skating to break the sound barrier with supersonic speed, or you commandeered your brother's abandoned skateboard as something to do with friends, now you're here. Now you're ready to bomb hills, practice pre-drifting, get footage, and get the adrenalin rush of your life. To go fast and stay in control you want a big wheel with a lot of contact with the pavement. The softer wheels are grippier, but eventually the wheel will lose speed if it is too soft. Cores in downhill wheels can be vented, centered, or offset depending on what you are looking for. It all comes down to the quality of 'thane under your board and your ability to rail a corner.
Centerset - Centerset wheels have cores that are placed directly in the center of the wheel, equidistant to the outer edge of each lip. This core placement style gives the most amount of grip because it creates a very large inner lip.
Another advantage of centerset wheels is that they can be flipped inside out to promote even wear and a longer lifespan. For this reason, many freeride wheels have centerset cores paired with small contact patches and round lips.
Square Lip - Square lips provide the most grip and allow you to carve deeper and corner tighter without worrying about losing traction. Square lip wheels are generally preferred for downhill riding.
Smooth - Smooth wheels have a shiny coating on their surface that is commonly referred to as its skin or mold release. Smooth wheels are generally preferred for their grip and traction.