The PDW Fatty Object CO2 Inflator is the first of its kind. The 38g cartridges inflate both plus size and fat bike tires. The precision machine alloy body is virtually indestructible, works on both schrader and presta valves. This is a must have tool for fat bikes and plus bikes. The 38g PDW cartridge will inflate a 26x4.8 tire to ~7psi while a 29x3 tire will inflate to ~22psi.