You?re near the end of an arduous bike trek and you get a flat, and the thought of using one of those little bike-mounted hand pumps is more than you can bear. What you need is a CO2 inflator. Inflators and cartridges are incredibly affordable, and if you have a flat tyre, whether in your car, motorcycle, or bicycle, you?ll wonder why you ever tried to do without them.
The inflator so-called looks something like a garden hose nozzle. The nozzle will generally accommodate both Presta and Schrader valves. The CO2 cartridge screws into the inflator and all you have to do is pull the trigger. One 16-gram cartridge carries enough pressure to inflate one racing (bike) tyre or two BMX tyres. Both inflator and cartridge are extremely compact and practical to carry on a bike. eBay features a wide selection of reasonably-priced inflators and cartridges--inflators are inexpensive and cartridges range in price depending on quantity. Ride on.