The Spinner NXT Black Belt brings the smooth, quiet ride of a belt to the Spinner bike family. The Spinner NXT Black Belt was created especially for riders who prefer the feel of a belt-drive system. Our first ever belt-driven bike has an integrated belt tension system for smooth trouble-free riding. The Spinner NXT Black Belt is the only belt-drive bike that uses our patented threadless connection drivetrain with enlarged pedal and crank connections for security and durability. Equipped with a smooth control resistance knob with direct pressure emergency stop. The handlebars and seat settings provide vertical and fore/ aft user adjustment for optimal bike fit. Designed with aluminum seat and handle bar posts to impair rusting. Warranty: Frame is covered for 10 years from the date of purchase for structural failure. Flywheel assembly, brake knob assembly, handle bar assembly, seat post, and foot adjustments are covered for three (3) years from the date of purchase. Handle bar post plastic sleeve, seat post plastic sleeve, bottom bracket assembly, seat saddle assembly, and -pin assembly, are covered for two (2) years for the date of purchase. Pedals, chain, brake pad assembly, rubber frame guard, brass brake nut and remaining parts are covered for one (1) year from the date of purchase. An advance warranty replacement kit of wear items is included, consisting of: one (1) brake pad and two (2) pedal straps.