The stans notubes baron s1 275 wheelset the baron s1 brings our patented high volume tubeless technology to plus tires the result is unheard of traction and control in a wheelset that responds instantly and rolls faster strong and light 6061 alloy stainless steel rim eyelets and easily replaceable standard spokes mean the baron s1 is built for the long haul combined with faster engaging cnc machined neo hubs available in configurations to fit nearly any bike the baron s1 is the fastest