What does the wheel hardness and the wheel diameter mean? Last Updated: 03/23/2011
The Wheels have 2 numbers on them that count. 1. The Wheel Hardness is measured on the Shore scale: Either on the D scale or the A scale D scales are for harnesses of Plastic Compound Wheels A scales are for harnesses of Urethane Compound Wheels The lower the Number the softer the wheel, this provides more grip with a little less roll. The higher the number the harder the wheel this provides a little less grip with more roll. 2. The Wheel Diameter is measured in millimeters 55mm and 57mm are used for Freestyle skating, primarily. (the 55mm are based on a lowering of the center of gravity). 63mm are used for Dance Wheels, Derby and General Skating. 63mm are used for the LARGE Figure Circles 61mm and 62mm are used for Hockey and Speed (are based on just a small lowering of the center of gravity). 60mm are used for LOOPS. Determining what wheel you need is based on what you will be using your roller skates for.