Genuine Innovations CO2 cartridges are available in various sizes, with both threaded and non-threaded options to match your inflator head. The 16-gram cartridges are suitable for standard bike tires, while the 20-gram cartridges are designed for larger volume tires like those found on mountain bikes and 29ers. To determine the appropriate size for your tires, consult a CO2 inflation chart. Genuine Innovations also offers a Presta valve adapter, which can be stored on your valve after use.