Designed for Fat & Semi Fat tire bikes the Air Tool Big Bore Pump packs massive volume-per-stroke & it features a head that still works with winter gloves on to make it perfect for backcountry winter fat biking. Oversized press-on Schrader & Presta head wont accidentally remove valve cores & can be easily used with thick gloves. Flexible hose attachment allows for aggressive pumping without fear of damaging valve stems. Inverted barrel design allows for high volume in a compact size. Coarse machined aluminium barrel for extra grip. Water bottle boss mount with elastomer band included. Max pressure: 50 PSI (3.5bar) Volume-per-stroke: 90cc