The disclosure provides a chain guide assembly configured to be mounted on a linkage assembly of a bicycle derailleur. The chain guide assembly includes an inner plate, an outer plate, a first connecting bridge and a second connecting bridge. The outer plate is spaced apart from the inner plate. Two opposite sides of the first connecting bridge are respectively connected to the inner plate and the outer plate. Two opposite sides of the second connecting bridge are respectively connected to the inner plate and the outer plate. The inner plate, the outer plate, the first connecting bridge, and the second connecting bridge are made of a single piece. In addition, the disclosure also provides a bicycle derailleur having the chain guide assembly and a structural reinforcement sheet of the chain guide assembly.

A chain damper for use with a bicycle may include a base having an attachment region that is configured to be attached to a bicycle and a chain receiving portion extending from the base in a first direction. The chain receiving portion can include a chain damping surface that includes a resiliently deformable damping material and at least partially bounds a chain receiving aperture. The chain receiving aperture may extend in an axial direction and may be configured so that when the chain damper is attached to the bicycle the axial direction is substantially aligned with the primary chain direction and the chain damping surface is spaced apart from the chain travel path.

A sprocket guard assembly comprising a sprocket having sprocket radial spokes, and having teeth on an outer perimeter, the teeth disposed in a plane CL1, each sprocket radial spoke communicating with a first cylindrical surface, a circular member having circular member radial spokes, and each circular member radial spoke communicating with a second cylindrical surface, a collar having an outer cylindrical surface, a fastener engaging the collar, the first cylindrical surface and the second cylindrical surface engaging the outer cylindrical surface, all coplanar in a plane CL2, and plane CL1 is offset from plane CL2.

A sprocket guard assembly comprising a sprocket having sprocket radial spokes, and having teeth on an outer perimeter, the teeth disposed in a plane CL1, each sprocket radial spoke communicating with a first cylindrical surface, a circular member having circular member radial spokes, and each circular member radial spoke communicating with a second cylindrical surface, a collar having an outer cylindrical surface, a fastener engaging the collar, the first cylindrical surface and the second cylindrical surface engaging the outer cylindrical surface, all coplanar in a plane CL2, and plane CL1 is offset from plane CL2.

A sprocket guard comprising a sprocket having sprocket radial spokes, and having teeth on an outer perimeter, the teeth disposed in a plane CL1, each sprocket radial spoke communicating with a first cylindrical surface, a circular member having circular member radial spokes, and each circular member radial spoke communicating with a second cylindrical surface, a collar having an outer cylindrical surface, a fastener engaging the collar, the first cylindrical surface and the second cylindrical surface engaging the outer cylindrical surface, all coplanar in a plane CL2, and plane CL1 is offset from plane CL2.

A detector for a bicycle that includes a magnet, which generates a generated magnetic field, and a magnetic field sensor. The mutual position of the magnet and of the sensor is fixed, and the sensor is immersed in the generated magnetic field. A length of a path intended for a non-diamagnetic movable element is immersed in the generated magnetic field; if in said path length there is at least one actual portion of the movable element, the sensor detects the magnetic field perturbed by the actual portion of the movable element. Bicycle equipment and a bicycle derailleur are also described.

A detector for a bicycle that includes a magnet, which generates a generated magnetic field, and a magnetic field sensor. The mutual position of the magnet and of the sensor is fixed, and the sensor is immersed in the generated magnetic field. A length of a path intended for a non-diamagnetic movable element is immersed in the generated magnetic field; if in said path length there is at least one actual portion of the movable element, the sensor detects the magnetic field perturbed by the actual portion of the movable element. Bicycle equipment and a bicycle derailleur are also described.

Embodiments of a front derailleur gear shifting system including various unique chain guides attached to and operating from a single pivot point. This derailleur system provides a simple, yet, elegant and robust improvement in shifting technique over conventional, lateral motion front derailleurs. Embodiments of open and closed annulus chain guides having specially shaped lifting and pulling surfaces for acting upon a bicycle chain during shifting are also disclosed. Additionally, as an optional enhancement, a dual-sided chain catcher that prevents unintended over-shifts in either direction is disclosed.

A compactable bicycle comprising a frame including a first and second frame portions wherein the frame is unfoldable to a use position for riding by the rider and is foldable to a storage position for storage. The bicycle includes: a rear brake, a rear brake lever, a rear break cable passes through a first cable guide, and a brake cable biasing member that is positioned to urge the rear brake cable back through the first cable guide to be between the first cable guide and the rear brake lever: front and rear wheel connectors to hold the front and rear wheels together: a crank, a front sprocket, a rear cassette, rear sprockets, a chain, and a derailleur; a chain guide that is positioned to engage the chain and to limit a lateral angle of the chain relative to the rear sprocket: or first and second frame element locking surfaces and apertures, and a plunger movable to a clamping position and to a release position.

A bicycle front derailleur with an integral cadence sensor serving to guard against undesirable actuation of either front or rear derailleur without necessary chain movement being present and additionally making use of a standard wireless remote control (RC) servo drive unit relying exclusively on spur gearing reduction facilitating highly efficient and accurate derailleur positioning thereof through a magnetic rotary encoder with direct sensing of derailleur position and with alignment of derailleur actuation components thereof in the horizontal plane guarding against undesirable transmission of gravitational and vertical inertial forces to wireless remote control (RC) servo drive unit adversely affecting accuracy.