For inflating large mountain bike tires on the trail Blackburns Mammoth 2Stage Mini-Pump provides quick and reliable performance. With a 2Stage design the flip of switch changes the pump from high-volume low-pressure to low-volume high-pressure for finishing off those last few PSI with ease. The rebuildable Anyvalve pump head attaches securely to Presta Schrader or Dunlop valve types and the 120 PSI maximum pressure lets the Mammoth 2Stage work for road tires as well.