A threaded 16g co2 cartridge for use with all lezyne co2 inflators it inflates 700c road tyre to 120psi 83bar or one 26 mtb tyre to 30psi 21bar 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 25 to 40psi 28bar they are available in 5 piece refill packs or 20 piece boxes