This pump has been a life saver on more occasions than I can recall. Without exaggeration this pump has re-inflated at least 50 flats since I have purchased it. Measuring about 2 feet long, unsprung, this marvelous pump has not only inflated my numerous flats, but it has also completed the inflation of numerous flats experienced by other riders as well.
What is there to be said about a pump? It does what it is designed to do, but this pump does it easily when compared to other "shorty" pumps. The high pressure tires of road bikes require at least 100 pounds of pressure to function in a manner that allows more than limping home or to the next pit. Most "shorty" pumps designed to be carried in a bike bag or on the frame of a mountain bike are not really designed to reach the pressures demanded by road bike tires. They are fine for the 60 psi range of most MTB tires, but in virtually every case, when I have led road bike rides, people who showed up with shorty pumps borrowed this pump from me to "top off" their pressures.
The pump is pictured twice to show the two modes. Where the handle forms a "T" it is ready for pumping. When it forms a straight stick, is is ready to be spring loaded inside the triangle formed by the bike frame in front of and below the seat. The spring loaded rod which is also the pump rod is collapsible in the straight line configuration. The pump is compressed to fit between intersecting frame members and then allowed to spring back open to hold it in place by the tension of the spring loading. On my Old Royce Union, the pump stores vertically from the bottom bracket to the top tube. On my Cannondale it stores parallel to the top tube, between the steerer tube and the seat tube.
With the advent of frame mounted water bottle cages, the area within the frame triangle is more cluttered, and sometimes it does not allow the optimum mounting of the pump with it's spring loaded feature. For instance, on my Cannondale, the steerer tube actually slants forward as it travels downward, so the pump would tend to "pop out" of place. So in that installation I use some velcro straps to hold it in place but, on Royce the unit works exactly as designed.
The wrap up, this pump fills road tires to very nearly road pressures with very little effort. In some applications (with some frames) it is self storing in others it is very easily stored with velcro straps. With absolutely no maintenance this pump has filled over fifty flats and it transfers between my Royce Union (Schrader Valves), my Burley Tandem (Schrader Valves), my Cannondale MTB (Presta Valves), and my Cannondale Road Bike(Presta Valves 120 PSI) without a hitch. The pump has never failed to get me back underway in any application and it does so with much less effort than that expended by owners of shorty pumps! I recommend the pump highly. It is inexpensive, light weight and it does exactly what it is designed to do.