EVO CX Fitness Sway Frame Indoor Bike with Orb Gear and Distance, RPM, Calories Readout, Grey/Yellow The orb gear drive System has a compact, single axis design that negates the need for a belt, chain, or external flywheel. It is a completely enclosed, three piece crank with an aligned Sun gear Core active sway frame sways with body movement so that riders can engage their core muscles in order to get more out of a traditional cardio workout Each EVO fitness bike Comes with a standard, specially designed set of handlebars that allow for the four most commonly used hand positions. They also feature Holders for two large water bottles and a center platform for Smart phones The EVA advanced computer readouts include rpm, time, distance, and heart RATE (via strap), as well as an adjustable lighting function. Users can accurately Track their progress in both light and dark environments The EVA fitness bike features a high-quality, durable seat that is both comfortable and easy to adjust. The seat is designed to fit every rider, not just hardcore cyclists