Mankind NXS 18" BMX BikeMankind are fully dedicated to ensuring riders of any age or height range have a BMX bike dedicated to them. The NXS 18" is built for riders anywhere between 3' 4" to 4' 6" and combines pro level looks with great specs, so it's a smaller size comfortable for younger riders without sacrificing the look of a full size BMX. Despite it's smaller size it still has everything you'd expect from a modern BMX, a sealed integrated headset, sealed Mid BB and a