Our 38 gram threaded CO2 cartridges will fill up your Plus or Fat bike tires with theA Fatty Object CO2 inflator.A A 38 gram CO2 cartridge will fill a 26x4.8" tire to 6-7psi or a 29x3.0" tires to 20-22psi. Theyre also food grade, which means theyre clean on the inside and wont gunk up your inflator or tire valve.A Please note that we are unable to ship CO2 cartridges to Hawaii or any international country. Specifications 38g CO2 cartridge Fills a 26x4.8" tire to 6-7psi Fills aA 29x3.0" tires to 20-22psi Food grade