Joeblow ace features an innovative three stage design that achieves both high pressures and high volume in record time stage one opens both barrels for big volume to reach 60 psi with 30 less effort than standard floor pumps stage two uses the main barrel only for pressures up to 120 psi while stage three engages the small barrel to achieve an amazing 260 psi padded handles wide stable base and large dial gauge make inflation easy smarthead automatically adjusts to fit presta and schrad