Serfas does it again with the innovative 2-In-1 Shock/Tire pump. Throw it in your pack for every ride and you have a dual purpose pump that boasts a 300psi capacity. It uses a dual action motion to make it easy to pump in higher volumes or higher pressures. The aluminum construction makes it super durable. A large gauge is easy to read and the air-release button makes fine-tuning pressure in shocks and tires a breeze.