Freeride - Wanna get sideways? If "drifting, heel side standies, pendulums, and Coleman" are part of your vocabulary you're in the right place. For freeride wheels; a smaller contact patch, a stone ground finish, and rounded lip all help them slide easily, right out of the box.
A word to the wise: if you are just getting into freeride try out a smaller size wheel (think 60mm-65mm) with a harder durometer (82a or harder) because it will be easier to break away into a slide, making it easier to practice. Practice slides with friends and try different setups. Will you flat spot your first set of freeride wheels before coring them? Yes. Will they wear unevenly and leave you with a couple bruises? Absolutely. But, it gives you a whole new look at the hills, a whole new freedom. The great Cliff Coleman (father of downhill slide) says, “If you can crouch down and ride a skateboard, then you can learn this slide" as he talks about the classic Coleman slide.
As you gain experience, and speed, you'll find bigger wheels can be better because they will last longer and will be faster on the hill. Different durometers, center-set vs side-set or offset cores, and different urethane formulas will help in different weather/road conditions so make sure you experiment to find your favorites.
Freeride takes you to a new level of skating. Simply put, it's groundbreaking.
Offset - Offset wheels have cores that are placed somewhere between centerset and sideset. Offset wheels give the rider the best of both worlds. Most downhill wheels and many freeride wheels are offset for a more forgiving slide initiation and hookup, while still providing ample grip and control in the slide.
Round Lip - Rounded lips allow the wheel to break traction more easily and offer smoother transitions from grip to slide. Round lip wheels are generally preferred for freeriding.
Stone Ground - Stone ground wheels slide much easier than smooth wheels right out of the box. Stone ground wheels don't have an initial break-in period like smooth wheels, and offer predictable slides without having to wear down the wheel surface.
82a - Soft with plenty of grip. You'll be able to smoothly roll over rough surfaces without getting hung-up on cracks or small rocks. These wheels are slightly harder than the standard 78a/80a's and have a faster roll speed. They transition easily into slides and have a tendency to glide across the surface of the road, making them wear slowly, but generally don't offer as much control as softer wheels. Ideal for cruising, carving, freeride, and downhill.
Urethane skate wheels generally range from 75a-101a, the numbers increase with the hardness of the wheel.