Small and light weight, this combo CO2/hand pump bicycle tire inflator will always keep your tires up and running. Fully controllable CO2 bicycle tire inflation along with high pressure hand pump built right in makes this the only pump/inflator you'll need to carry. Works with threaded CO2 cartridges only. To inflate with CO2, screw CO2 cartridge into pump head, attach to valve stem (presta only) and twist cartridge to inflate tire. Carbon Road hand pump with back-up CO2 inflation built right in. Valve interface: Slip onto Presta (Not compatible with Schrader) ÔÇó Includes one 16 gram threaded CO2 cartridge