Abstract: A bicycle air pump includes a cylinder portion, an inner piston, a piston rod, a head portion, a handle and a magnetic mechanism. The cylinder portion includes a first end, a second end and a chamber disposed between the first and second ends. The inner piston is movably disposed in the chamber of the cylinder portion. The piston rod has a first end and a second end coupled to the inner piston. The head portion is coupled to the cylinder portion. The head portion includes an outlet passage communicated with the chamber cylinder portion for supplying air to an object to be inflated. The handle is coupled to the piston rod to move within the chamber. The magnetic mechanism includes first and second closure members for engaging together magnetically to hold the piston rod stationary with respect to the cylinder portion.

Abstract: A bicycle air pump is basically provided with a cylinder portion, an inner piston, a piston rod, a head portion, a handle and a magnetic mechanism. The cylinder portion includes a first end, a second end and a chamber disposed between the first and second ends. The inner piston is movably disposed in the chamber of the cylinder portion. The piston rod has a first end and a second end coupled to the inner piston. The head portion is coupled to the cylinder portion. The head portion includes an outlet passage communicated with the chamber cylinder portion for supplying air to an object to be inflated. The handle is coupled to the piston rod to move within the chamber. The magnetic mechanism includes first and second closure members for engaging together magnetically to hold the piston rod stationary with respect to the cylinder portion.