Bell's Zephyr Series floor pumps are designed for inflation of all types of bike tires and valves Presta or Schrader. Their tall barrel design offers less resistance, making it easy to inflate cruiser, mountain, BMX, and kids' tires, as well as the thinner, high-pressure tires found on road and commuter bikes. The Zephyr 550 features an easy-to-read base-mounted pressure gauge and rugged steel-barrel construction. Other features include dual pump head for both Presta and Schrader valves and 100 PSI max.