The topeak joe blow ace is an incredibly high performance floor bike pump thanks to its innovative features and top quality design making it easy to use and highly convenient what39s so great about this topeak pump is the cutting edge 3 stage design that allows you to achieve high pressures up to 260psi and high volume in record time so how does the 3 stage design actually work well stage one opens both barrels to increase volume to reach 60psi then stage two uses the main barrel only