Designed for fat and semi-fat tire bikes, the Air Tool Big Bore Pump packs massive volume-per-stroke and features a head that works with winter gloves on, making it perfect for backcountry winter fat biking. The pump delivers high volume in a compact size thanks to its inverted barrel design. The coarse machined aluminum barrel provides extra grip, while the flexible hose attachment allows for aggressive pumping without fear of damaging valve stems. A water bottle boss mount with elastomer band is included for convenient carrying.