It's not much longer than a ballpoint pen, yet it can refill your flat tire in just a few strokes: the Air Support Big Pen mini pump takes up hardly any space in your luggage and can be conveniently mounted on the bottle cage mounts of your bike with the included holder. The Air Support Big Pen features a pressure switch and can efficiently inflate several types of bicycle tires. When set to "High Pressure" (HP), it reaches 8 bar or 110 psi. In "High Volume" (HV) mode, it achieves 5.5 bar or 80 psi. Thanks to its twin-valve head, it is compatible with both Schrader and Presta valves. Inside the lightweight aluminum body of the mini pump, there is also a retractable hose that can be bent for better handling.