Wren Boost MTB/Fatbike Frame Mount Pump with Patented Mix Valve for Presta or Schrader Valves Patented MiX 2in1 Smart Head fits Presta and Schrader valves securely Simple turn of the MiX knob switches valve type quickly and easily - no loose parts or adaptors 8 inch flexible hose stays attached and simply slides easily in and out of the barrel 90 psi / 6.2 bar high volume barrel for fast fills, perfect for high volume MTB/Fat bike tires