I use/carry Co2 cylinders for my fat tire bike, I use about 2-1/2 12 grm cylinders to fill the Wart Hog tires to just less than 30 lbs. I use a lot of 12 grm cylinder for my air rifles, my co2 inflator uses 16 grm cylinder threaded type, I just put 5 or 6 Nickels inside the carry handle and can use the 12 grm cylinders also, plus I don't waste any gas etc.
It is this model:
https://www.thebikesmiths.com/produc...vations-g20310
Also use the same item for my ATV along with mushroom plugs, which work perfectly.
HtH,
Don