Riding With The Flow The HX 1501 is one of the best wheels for mountain bikers today. Its light weight and strong specs help cyclist pedal to the maximum on every tight corner and jump on the track. For some, flow means to pedal up a never ending gravel climb and getting into a trance-like rhythm. To others, flow is when corners are linked up seamlessly, dirt flying sideways. And yet another group of riders seeks new adventure in burly terrain. Either way: The wheels of the HX 1501 SPLINE ONE line up feel right at home doing all of the above. Strong, light and offering the right width for your riding needs, it climbs with the best and descends with the best. The Ratchet System is the most durable freehub system out there, safely driving you forward in any conditions, at any time. A light and strong spec through and through makes sure you pedal into the flow, whatever your flow is.