Dual Suspension? You May Need A Suspension Pump - If you're the proud owner of a full-suspension bike equipped with air shocks, consider getting a suspension pump. These have very small-diameter barrels, gauges that may go as high as 300 psi and bleed valves to let small amounts of air out of the shock. These special tools are necessary because regular bicycle pumps usually cannot achieve high-enough pressures. With a suspension pump, you can easily fine-tune shock performance ensuring optimum action on rides.