This unique mountain bike specific floor pump features a super-sized barrel that inflates tubes nearly 50% faster than normal floor pumps. It delivers the higher volume required for large off-road tires and a large 3. 5" easy-to-read base-mounted analog gauge with air release button to help dial in the proper pressure. Equipped TwinHead pump head fits either Presta, Schrader or Dunlop valves and is one of the best value floor pumps on the market.