Designed for Fat and Semi Fat tire bikes, the Big Bore packs massive volume per stroke and a unique head that still works with winter gloves on.  Features Oversized press-on Schrader and Presta head won't 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 aluminum barrel for extra grip. Water bottle boss mount with elastomer band included. Max pressure: 50psi (3.5bar) Volume per stroke: 90cc About SpecializedAs their motto says, “Made for riders, by riders”. Specialized made the first production mountain bike in 1974, and since then they have been industry leaders. From lightweight carbon race bikes, innovative kids bikes, class leading e-bikes and tyres & accessories, Specialized continue to push boundaries.