16-pack of Planet Bike threaded 20g CO2 replacement cartidges. Be sure to add Planet Bike's 20g threaded CO2 replacement cartridges to your flat kit so you'll be able to perform lightning-fast flat fixes on the go! Don't let a punctured tire slow you down, our 20g threaded canister delivers a swift burst of air, getting your tire up to optimal pressure in seconds whether you're riding with inner tube or tubeless tires. Designed with your convenience in mind, our CO2 canister is compact and lightweight, fitting seamlessly into your saddlebag, jersey pocket or fanny-pack for easy access during rides. Compatible with various threaded inflator heads, it's a versatile solution for road bikes, mountain bikes, and more. It's a must-have for gravel and 29er riders.