A Threaded 16g Lezyne CO2 cartridge for use with all Lezyne CO2 inflators. The Lezyne CO2 cartridge inflates 700c road tyre to 120psi (8.3bar) or one 26? MTB tyre to 30psi (2.1bar).* They are available in 5 piece refill packs or 30 piece boxes. A new All-Mountain standard. This threaded 25g CO2 cartridge for use with most Lezyne CO2 inflators. It inflates one large MTB tyre (26? x 2.5?) to 40psi (2.8bar).* They are available in 5 piece refill packs or 20 piece boxes.