Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Roller sports are sports that use Human powered vehicles which utilize rolling either by gravity or various pushing techniques. Typically ball bearings and polyurethane wheels are used for momentum and traction respectively, and attached to devices or vehicles that the roller puts his weight on. The international governing body is the International Roller Sports Federation (FIRS). A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the moving parts of the bearing.The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It achieves this by using at least two races to contain the balls and transmit the loads through the balls.

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