Optional modes: high pressure or high volume - Built-in pressure gauge up to 120 psi WHEN IT COMES TO ESSENTIAL CYCLING GEAR, THE PUMP RANKS HIGH. AIR UP YOUR TYRES, GRAB YOUR MINI PUMP AND GO. Giant's full line of Control Tower floor pumps, Control Mini and Pocket pumps will keep you rolling with ease. User friendly, efficient and full of features so you can spend more time riding