CO2 cartridges are great--they're quick, easy, and lightweight. However, they lack the control of a traditional pump. The Lezyne Trigger Drive CO2 Cartridge System changes that. The Trigger Drive is made with a machined aluminum chuck for light weight and durability. It joins the valve at a right angle to make it easier to get between spokes and under disc brake rotors. The chuck also threads on, so no CO2 is lost. The trigger is spring loaded for total control, so you can start with a long burst to seat the bead, then finish with shorter bursts for precise control.