Crank Brothers CO2 Cartridges Bulk Pack One sure way to ruin a ride is to get a flat tire. Always a bummer and never expect, flats can put a quick stop to your ride, regardless of how far you've gotten. A CO2 cartridge is a quick and easy way to re-inflate your tire after replacing your tube. These 16g threaded cartridges simply screw into a CO2 inflator and will get you back on the road (or trail). Stock up with this bulk pack of 20 or 30 cartridges to forget about flats and concentrate on the ride! FEATURESSold as a 30 pack of 16g or 20g threaded cartridges Sold as a 20 pack of 25g threaded cartridges SHIPPING RESTRICTIONThis item is classified "ORM-D" and cannot be shipped via air. It can only be shipped via ground shipping methods. If you add this item to your cart, the list of available shipping methods will be reduced. For more variety of shipping options, consider removing this item from your cart (or placing a separate order using a ground shipping method. ) | Crankbrothers | Co2 Cartridges Bulk Pack Co2 20G Bulk Pack - (30 Pieces)