Lezyne's 16G Threaded CO2 Cartridge pack ensures that you won't get stranded out on the road with a flat and not enough CO2. Lezyne's 16g CO2 will inflate 700c road tires to around 120psi (8. 3bar) or one 26-inch mountain tire to 30psi (2. 1bar). The cartridges are threaded for use with all Lezyne CO2 inflators. The pack includes five refill cartridges.