Air Rush is a compact mini electric pump that makes flat fixes a breeze. It easily tops up tires pre-ride or fully reinflates two tires from flat, so you can get back to your ride sweat-free. Its bright digital display shows target pressure, current pressure, battery charge, and pressure units, while three simple buttons make operation easy. Plus, a single charge replaces up to four 16g CO cartridges.tle boost. Trek Air Rush Electric Pump - Black | Black | Christy Sports