So what makes this compressor special? It's small enough to fit into even the tightest space and quiet enough to mount in the cab. It has enough output to air up four 35" - 37" tires in a single duty cycle and typically airs up a 35" tire in just over two minutes. And, it works. We've tested this unit in ovens, freezers, underwater and in the silty dust of the Simpson Desert and it continues to perform.