Skate wheels vary in hardness which can be measured by a device known as a durometer. Wheel hardness is important depending upon the surface upon which the player will skate upon. Hockey played on asphalt or concrete requires a softer wheel to absorb the shock from the rougher surface. A harder wheel such as 85 is great for concrete, but these wheels won t bite and grip asphalt. A hardness of 78 is a good general all-around wheel.
Softer wheels wear more quickly than harder wheels.
Harder wheels slide easier and last longer. Proper wheel rotation will significantly extend a wheels useful life. Wheel size also can vary. Most recreational skating wheels are between 70 mm and 72.5 mm and hockey wheels are usually between 72 mm and 76 mm. Wheel bearings are what make the difference between a wheel that moves easily without significant resistance and a wheel that is requires a lot of energy to turn.