Designed for fat and semi fat tyre bikes the big bore packs massive volume per stroke and a unique head that still works with winter gloves on oversized press on schrader and presta head wont accidentally remove valve cores and 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 w