Mine is on the side of seat tube nestled next to the bottle cage. It is snug against the tube, and only *very* rarely does the foot flap of the pump rotate out so that there is a little "click" as I pedal (like an audible cadence meter!). I usually just reach down and rotate it out of the way again. When I use my Topeak clip-on back rack, I attach the pump to the side of the rack instead.Originally Posted by Dogmama