A combination lock and pump for use with a bicycle. The combination lock and pump has a flexible cable including an inflation tube running parallel with a metal rope or chain. The flexible cable has a male end preferably including a lock bolt or shackle and a piston-cylinder pump. The flexible cable also has a female end preferably including a lock cylinder with a key hole and one or more apertures to receive either a bicycle tire's valve stem or the male end's lock bolt or shackle. When used as a lock, the combination secures the bicycle from theft by looping the flexible cable around the bicycle and locking together its male and female ends. When used as a pump, the combination's female end attaches to the bicycle tire's valve stem and inflates the tire by actuating the pump of the male end.