Abstract: A bicycle derailleur having a derailleur fork. The inner plate of the fork according is made of light alloy, while the outer plate is made of fibre-reinforced synthetic resin. A rear bridge having interlocking portions connects the inner and outer plates.

Abstract: A chain guide for the front derailleur of a bicycle has a first plate intended to shift a chain from a first toothed crown with a diameter to a second toothed crown with a larger diameter, a second plate facing the first plate and intended to shift the chain from the second toothed crown to the first toothed crown and a connection between the first plate and the second plate. The first plate has a first thrusting portion for shifting the chain from the first toothed crown to the second toothed crown. The first thrusting portion is defined on a projection that is defined at a first portion of the first plate and has a lower profile that projects with respect to the lower profile of the remaining portion of the first plate. It is thus possible to minimize the size of the other portions of the first plate, thus achieving a weight reduction of the chain guide, without altering its performance or reducing its structural strength.

Abstract: A device for the attachment of a derailleur to a bicycle, in particular for the attachment of a front derailleur to a support welded on a seat tube of a bicycle adjusts the position of the derailleur along at least one axis substantially perpendicular to a longitudinal axis of the seat tube of a bicycle. In particular, the device adjusts the position of the derailleur along an axis Y lying on a plane substantially parallel to a lying plane of a toothed crown associated with the bottom bracket of a bicycle and, preferably, also along an axis Z substantially perpendicular to said lying plane of a toothed crown associated with the bottom bracket. This ensures a better positioning of the derailleur with respect to the toothed crowns of the bicycle and, therefore, a better operation of the derailleur during gearshifting.

Abstract: Front bicycle derailleur comprising an electrical motor controlling an actuating arm, consisting of an extension of an articulated arm of the derailleur, by means of a geared reduction transmission, comprising a worm screw and a sector gear, or a bevel pair.

Abstract: A chain link for a bicycle chain is disclosed that comprises a first coupling hole formed at a first end of the chain link; and a second coupling hole formed at a second end of the chain link opposite the first end. The coupling holes are adapted for receiving pins that couple a chain link with an adjoining chain link and the chain link defines at least one area of reduced thickness located between the first coupling hole and the second coupling hole.

Abstract: Front bicycle derailleur comprising an electrical motor controlling an actuating arm, consisting of an extension of an articulated arm of the derailleur, by means of a geared reduction transmission, comprising a worm screw and a sector gear, or a bevel pair.

Abstract: A bicycle sprocket assembly having at least one subassembly including a sprocket support member and two sprockets. The support member has at least one engagement portion for coupling it to a bicycle freewheel and at least one fastening portion arranged in a radially external position with respect to the engagement portion. Both sprockets are fixed on the sprocket support member on the same side of the fastening portion.

Abstract: Gear assembly for a bicycle gear change, comprising at least one gear with a larger diameter and at least one gear with a smaller diameter. The selected gear, generally of a larger diameter, has at least one sector dedicated to upwards shifting that may include a plurality of shifting aid means to facilitate upwards shifting and a second gear, generally of a smaller diameter, has at least one sector dedicated to downwards shifting that may include a plurality of shifting aid means to facilitate downwards shifting.

Abstract: Front bicycle derailleur comprising an electrical motor controlling an actuating arm, consisting of an extension of an articulated arm of the derailleur, by means of a geared reduction transmission, comprising a worm screw and a sector gear, or a bevel pair.

Abstract: A sprocket (10) of a chain transmission for a bicycle is described, intended to be coupled with a further sprocket (3) with a smaller diameter in a group of sprockets integral in rotation. The sprocket (10) comprises a plurality of teeth (13) which follow each other on the sprocket (10) separated by spaces (14) according to a direction of rotation (R) of the sprocket (10), in which each tooth (13) has a thickness, a width and a height and has a lead side (31), a following side (32), a front side (33) and a rear side (34).

Abstract: A hollow crank arm for a bicycle comprising a body of elongated shape, at the ends of which are formed, respectively, an area for connection of the bottom bracket spindle and an area for connection of the pedal. The body includes a cavity of elongated shape and two solid end portions which are the aforesaid connection areas for the bottom bracket spindle and for the pedal. The crank arm is preferably formed through a forging process.

Abstract: A bicycle derailleur having a derailleur fork. The inner plate of the fork according is made of light alloy, while the outer plate is made of fibre-reinforced synthetic resin. A rear bridge having interlocking portions connects the inner and outer plates.

Abstract: Electrically operated actuating apparatus for a bicycle derailleur, having an output shaft (16) rotationally connected to a driven shaft (29) by means of a coupling (34), allowing a limited misalignment between the axis (33, 32) of the output shaft (16) and the driven shaft (30). The coupling is preferably an Oldham coupling.

Abstract: Fork (4) of a bicycle front derailleur comprising an outer plate (6) and an inner plate (5), which are two separate elements made of different materials, the inner plate (5) being stiffer and made of a harder material and the outer plate (6) being made of a lighter material.

Abstract: Front bicycle derailleur comprising an electrical motor controlling an actuating arm, consisting of an extension of an articulated arm of the derailleur, by means of a geared reduction transmission, comprising a worm screw and a sector gear, or a bevel pair.

Abstract: Bicycle crank comprising: an elongated core with a first and a second end, a first and a second insert arranged on the ends of said core, and a high-resistance fibre coating incorporated in a plastic material matrix forming a casing incorporating said core and said inserts. The core is a pre-formed element and each insert is connected to the respective end of the core by means of a respective union element with recesses for establishing a shape coupling with an insert and the respective end portion of the core.

Abstract: Bicycle crank comprising: an elongated core with a first and a second end, a first and a second insert arranged on the ends of said core, and a high-resistance fibre coating incorporated in a plastic material matrix forming a casing incorporating said core and said inserts, The core is a rigid element and each insert is equipped with a connecting portion inserted into a respective end of the core to establish a shape coupling therewith.

Abstract: Electrically operated actuating apparatus for a bicycle derailleur, comprising an output shaft (16) rotationally connected to a driven shaft (29) by means of a coupling (34), allowing a limited misalignment between the axis (33, 32) of said output shaft (16) and said driven shaft (30).The coupling is preferably an Oldham coupling.

Abstract: Fork (4) of a bicycle front derailleur comprising an outer plate (6) and an inner plate (5), which are two separate elements made of different materials, the inner plate (5) being stiffer and made of a harder material and the outer plate (6) being made of a lighter material.