The Crank Brothers Gem Pump features a stunning, laser etched aluminium body. A reversible head switches between Presta and Schrader valves easily and quickly. Inflating the tyres won't take long, with large dual piston allowing 2 effortless modes, 1-40 psi high volume and 40-100psi high pressure, so no matter whether you're running a 700x25c road tyre or a 29x2.6 MTB tyre, you'll be back up to pressure in no time! At just 176mm long and weighing only 131g, the Gem is easy enough to carry on the go in a jersey pocket, saddle bag, hip pack or hydration pack!