Abstract: A derailleur including an articulated quadrilateral mechanism, having four parallel articulation axes is provided. At a first articulation axis, between a fixed member and a first connecting rod, the fixed member includes a first forked structure embracing the first connecting rod. The first forked structure includes two opposite flanges having respective holes aligned along the first articulation axis, and the first connecting rod includes a hole aligned with the first articulation axis. A pin is inserted through the two holes of the first forked structure and the first connecting rod. The use of the fixed member creates a more favorable distribution of the stresses induced in the first connecting rod and the pin by the traction of the derailleur control cable.

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: A right crank arm assembly for a bicycle, comprises a right crank arm and at least one front sprocket coupled with the crank arm at at least one coupling portion of the crank arm. The front sprocket has an inner side adapted, in use, to face towards the frame of the bicycle and an outer side opposite the inner side. The assembly comprises at least one first crank arm element which acts in contact with the front sprocket on one of said sides and at least one second crank arm element which acts in contact with the front sprocket on the other of said sides. The contact action of the crank arm elements on the two opposite sides of the front sprocket prevents the twisting deformation of the front sprocket during pedaling. Such a deformation would cause a reduction in the transmission efficiency of the right crank arm assembly.

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 right crank arm assembly for a bicycle, comprises a right crank arm, a first annular element directly coupled with said crank arm at least one first coupling portion of said first annular element and at least one second annular element coupled with said crank arm and of a smaller size than said first annular element. The first annular element comprises a toothing that extends radially towards the outside along a primitive circumference having a predetermined diameter. Said at least one first coupling portion is entirely contained in a first area extending radially towards the outside starting from an ideal circumference having a diameter at least equal to ? of said predetermined diameter. Such an annular element constitutes the front sprocket of the crank arm assembly of the present invention and consists of a simple toothed band. Such a front sprocket is particularly light in weight.

Abstract: A sprocket of a chain transmission for a bicycle is described, intended to be coupled with a further sprocket with a smaller diameter in a group of sprockets integral in rotation. The sprocket comprises a plurality of teeth which follow each other on the sprocket separated by spaces according to a direction of rotation of the sprocket, in which each tooth has a thickness, a width and a height and has a lead side, a following side, a front side and a rear side. The sprocket has a front bevel on at least one tooth of first disengagement of said plurality of teeth and a rear bevel on at least one tooth of last engagement of said plurality of teeth.

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 crank arm assembly is disclosed, comprising a crank arm having a first end for coupling with a bottom bracket assembly and a second end for coupling with a pedal, at least one of the first end and the second end comprising a hole extending from a side of the crank arm for coupling with an axle of the pedal or of the bottom bracket assembly, respectively, further comprising a reinforcing element extending around the hole at the side of the crank arm, and constrained to the crank arm.

Abstract: A bicycle crank arm assembly is disclosed, comprising a crank arm having a first end for coupling with a bottom bracket assembly and a second end for coupling with a pedal, at least one of the first end and the second end comprising a hole extending from a side of the crank arm for coupling with an axle of the pedal or of the bottom bracket assembly, respectively, further comprising a reinforcing element extending around the hole in the proximity of the side of the crank arm, having a portion configured for receiving an abutment portion of the axle resting upon it, and wherein the crank arm and the reinforcing element contact along a respective surface not entirely contained within a plane perpendicular to an axis of the hole.

Abstract: A sprocket of a chain transmission for a bicycle is described, intended to be coupled with a further sprocket with a smaller diameter in a group of sprockets integral in rotation. The sprocket comprises a plurality of teeth which follow each other on the sprocket separated by spaces according to a direction of rotation of the sprocket, in which each tooth has a thickness, a width and a height and has a lead side, a following side, a front side and a rear side. The sprocket has a front bevel on at least one tooth of first disengagement of said plurality of teeth and a rear bevel (60) on at least one tooth of last engagement of said plurality of teeth.

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 crank assembly for a bicycle's bottom bracket assembly comprises a shaft extending along a longitudinal axis, at least one crank arm associated with at least one free end of said shaft, first front coupling means formed on said shaft and second front coupling means formed on said at least one crank arm, said first and second front coupling means being coupled together. In particular, the aforementioned first and second front coupling means comprise respective front toothings. The front coupling is located in an end zone, or on the outside, of a bottom bracket assembly's shaft's housing box formed in the bicycle's frame. The front coupling introduces a structural discontinuity between crank arm and shaft, for which reason the bending load exerted on the crank arm during pedaling is transmitted to the shaft to a small degree.

Abstract: A bicycle sprocket assembly having at least one subassembly including a sprocket support member and two sprockets is presented. 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: 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: A bicycle crank having a casing with first and second ends and a laminated construction of structural fibres incorporated in a thermosetting resin is presented The crank also has first and second inserts, each arranged at a respective end of said casing and are structurally united with said casing by the laminated construction.

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: A bicycle crank and a method of making a bicycle crank is provided. The bicycle crank has an elongated core with first and second ends, first and second inserts arranged on the ends of the core, and a high-resistance fibre coating incorporated in a plastic material matrix which forms a casing incorporating the core and the 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: 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: A bicycle crank is provided comprising an elongated core with a first and second end, a first and second insert are arranged at the ends of the core and a high-resistance coating of fibers incorporated in a plastic matrix material forms a coating for the core and inserts. The core is a preformed element and each insert is connected to the respective end of the core by a union element having recesses to establish 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 the core, and a high-resistance fiber coating incorporated in a plastic material matrix forming a casing incorporating the core and the inserts is provided. 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.