Featuring a unique chambered design, the Pressure Overdrive is ideal for seating even the most stubborn tubeless tires. The secondary chamber can be pumped up to pressure enabling a stainless steel foot-lever to release the compressed air in an immediate, continuous discharge, quickly and easily seating the tire bead.The Pressure Overdrive features a durable steel and aluminum construction paired with a highly accurate and precise analog pressure gauge. An extra long, nylon-reinforced braided hose terminates in our Presta andM6x0.8 compatible ABS-1 Pro Tubeless chuck offers plenty of versatility.Note: When using the Pressure Overdrive as a regular pump, you must fill the air chamber before air will begin to flow into empty tire/tube. When topping off a tire/tube that already has pressure in it, the chamber will have to reach the same pressure the tire/tube is at first before it will begin to inflate it further. SPECS: Weight: 2492g Dimensions: 650mm, 240mm, 174.6mm Maximum PSI: 220psi | 15.2bar Features: High Volume Pump Chuck: ABS-1 Pro Tubeless Chuck | Presta/M6x0.8 Base: Aluminum Gauge: 2.5 Analog Pump Type: High Volume Handle: Wood Piston: Steel Barrel: Steel