That's a great set of wheels you've got!
The upper end is passed over a guiding quadrant Q to a set of wheels or fixed quadrants I, 2, 3, ...
There are two main factors when considering what set of wheels (they act just like the tires on a car) to choose for your skateboard: size and durability.
Finding and restoring used power wheels will save you a lot of money and still give your kids all the benefits of a brand new set of wheels.
It is also nice to have a detachable or retractable set of wheels and handle, so the briefcase looks like a normal business bag when you walk into a meeting.
You should be able to get more wear out of your Heelys shoes than just that one set of wheels gave you.