Another 47+ Hand Air Pump For Tires. Just detach and reattach to reset once you've pumped your tires to the pressure you want, simply flip the switch on the pump head so it pops off, and retighten the locking nut before you. Portable hand bicycle pump tire air inflator schrader valve ball needle hose mtb. If air seems to be coming out of the pump and not into your tires, you may need to readjust the pump head slightly.