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.