This diddy Power Pump from über stylish bike bling maestros Crank Brothers is cute, small and neat enough not to need a mounting bracket. It can be easily hidden in a pocket or bag, where the open-ended dual pump heads are safely hidden away from muck and other grubble.
There's another Presta and Schraeder double-header that locks onto its relevant valve by a turn of its winged collar. It can be rather fiddly and quite tight to wrestle with, feeling as if it wants to rip the valve off at times. Start pumping the dual piston alloy barrels on the High Volume mode and then, when that gets sweaty, twist the end to the High Pressure setting.
There's not much of a shaft to grasp, but that large, knurled end is a handy rest for the palm of the hand. It's all very easy on the arm, especially on the High Pressure setting - as if there's no air going into the tyre at all. It's supposed to pump up to 115psi, but you'll have to find a roadie bike with that sort of tyre requirement to check out whether this is true or not.