Portland Design Works CO2 3-Pack One Color, 16g Threaded

Pumping up a flat is great if you're working on your forearm muscles, but if you just want to fill up your tire and get going, a cartridge from the Portland Design Works CO2 3-Pack's a better way to go. Each cartridge will fill up a road or mountain tire enough to get you home, and they're compatible with standard CO2 inflators.