Rollerblading is just a slang term for inline skating. There are two common sizes of bearings for inline skates and one of them is only popular for inline hockey. You can replace any bearing with another of the same size. If you want to change sizes, you need to replace the wheel, bearings, and bearing spacer at the same time. The 608 bearing is used on almost all skates and skateboards. They are 22mm (7/8 inch) in diameter. The 688 bearings are used in some hockey skates and were used for a short while in speed skates. They are much smaller at 16mm (5/8 inch) diameter.,
It's actually a lot different. Depending on what kind of skates you have (figure or hockey), Stopping is a bit harder for some people and it is a lot more slippery. At first, if you have figure skates, you will trip a lot on the toe picks. On Figure Skates you can turn and spin, unlike most roller blades.
