We know that flat tires are a drag and they usually happen at the worst times and rarely when you have a pump handy. Using Co2 is, without a doubt, the greatest time and space saver for cyclists, (unless you can afford a team follow car). You can inflate your friends' tires in a pinch, (pun intended) and maybe they will pay you back with a beer or two. Everyone wins... Features: Standard threaded cartridges are 3/8" x 24tpi thread to fit any brand inflator Law prohibits ORM-D materials from shipping by air 16g size is perfect for road tire, (700c)