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Roller skate wheel durometers measure urethane hardness
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Not all plastic rings are created equal; some are meant to grip, and some are meant to slip. The durometer scale determines how hard a skate wheel is, with lower numbers absorbing rough outdoor pavement and higher numbers providing a slick, fast roll on indoor wood. Choosing the wrong hardness guarantees you will either feel every pebble or slide uncontrollably into the rink walls.
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