Seating tubeless tire beads requires air volume delivered fast enough to push both sides of the tire into the rim hooks before the air escapes. Regular floor pumps supply steady pressure but lack the burst needed to overcome the gap between a deflated tire and the rim's bead seat. The Pressure Overdrive from Lezyne addresses this with a secondary chamber that holds compressed air up to 220 PSI, which you release through a foot-operated lever to dump the entire volume into the tire in one continuous blast.

The steel barrel and aluminum base construction supports the pressure requirements without flexing. The secondary chamber sits alongside the main pump barrel, connected through a foot lever at the base. You pump the chamber up to pressure with the lever in the up position, then step on the lever to release the air through the hose and into your tire. The analog gauge reads up to 220 PSI so you can track chamber pressure as you pump. The varnished wood handle maintains comfort during the 50 or so strokes needed to charge the chamber to 150 PSI, which seats most tubeless setups.

The nylon-reinforced braided hose extends long enough to reach bikes mounted in repair stands. The ABS-1 Pro Tubeless chuck threads onto Presta valves or the M6x0.8 valve stem threads with the core removed, which provides better airflow when seating tires. The screw-on design holds secure under the pressure surge when you release the chamber. The chuck includes a bleed valve for fine-tuning pressure after inflation.... Read More