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HOW TO INFLATE A PRESTA VALVE BIKE TIRE- WITH THIS PUMP 101 Take off Bike Tire Valve Cap Unscrew the little nut thing at the bottom, 1/4 turn Pump Level is set to neutral Unscrew the grey cap on the pump Unscrew grey portion of cap on pump valve You'll find a gasket Insert Grey Screw cap and Gasket onto bike valve Insert Bike Valve firmly inside open Pump Valve Lower Gasket Screw the Grey Screw Cap firmly down, with Gasket inside Turn Valve Lever Out (Arrow Point at Grey Cap Valve) Pump 25+ times to reach 80+ PSI Turn Valve Lever back to Neutral - Expect a short burst of air (not much of a loss of psi from my testing) If you hear a leak at this point, or any point before this, you messed up the seating of the gasket and position of Bike Valve/Bike Pump - Please reseat gasket - try again, keep trying, no air should leak. Keep pump valve steady, while unscrewing grey cap off valve's Once Loose pull away Pump Valve quickly - then pull off the grey cap and gasket No air should hiss out, throughout this process. Enjoy your inflated tires. Took half an hour to figure out without instructions. Lots of reviews flaming product, when it's fine - they just don't know how to use it. Partially sellers problem as well, for not sending out more instructions. Good Luck