The Blackburn Chamber HV Floor Pump is a high-volume floor pump specifically designed for mountain bikes. Standard floor pumps go up to 150 PSI and beyond - which is way more than you need for mountain bike tires. This one is purpose-built for MTB. It has an oversized barrel that lets you quickly dial in tire pressure in precise increments, plus a supersized 4" gauge that's easy to see. Its Anyvalve™ Pump Head works great on Presta, Schrader and Dunlop valves. No leaking, no fuss, clean and simple.