Abstract: A mechanical multi-rod disc brake contains: a braking unit including an engagement structure having two bases, two swing arms, two wear-resistant sleeves, and two fixing pistons between which an accommodation space is defined so as to accommodate a stop disc. A respective one wear-resistant sleeve has a respective one fixing piston. A drive unit includes a multi-rod structure, and a respective one rotary shaft is rotatably connected with a respective one driven bolt rotatably connected with a respective one driving member via a respective one connection portion. A respective one joining element has a receiving hole rotatably connected with of a first extension of a first connection stein or a second extension of a second connection stein. Each of the first extension and the second extension has a resilient element, and the first and second extensions are connected with a brake cable via the first and second apertures.

Abstract: A multi-speed drive hub for a bicycle contains: a hub shaft, a speed-changing transmission, a speed shifter, and a sprocket set. The hub shaft is connected on a center of a wheel rim of the bicycle and includes a speed-changing transmission. The speed-changing transmission includes at least one drive element and an actuator for driving multiple force segments of the speed-changing transmission to rotate reciprocately. The speed shifter includes a fitting sleeve which has a third fixing orifice corresponding to the at least one drive element. The sprocket set includes multiple speed cassettes of different diameters and includes multiple spacing spaces, each of which is defined any two adjacent speed cassettes. The fitting sleeve has multiple ribs and multiple flexible sheets. Each drive elements includes multiple retainers, multiple columns, and multiple force segments.