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 right crank arm assembly for a bicycle, comprises a right crank arm and at least one front sprocket coupled with the crank arm 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 method for electronically controlling a bicycle gearshift by detecting a first actual command value of an actuator such as to position a motion transmission chain in engagement with a first of at least three coaxial toothed wheels, and a second actual command value of the actuator such as to position the chain in engagement with a second of said toothed wheels. For each toothed wheel, there is determined a nominal command value of the actuator theoretically such as to position the chain in engagement with said toothed wheel. Computing an actual command value of said actuator at least for each of said toothed wheels other than the first and second toothed wheel, based on said nominal command values and on said first and second actual command value. An electronically servo-assisted bicycle gearshift having modules adapted to implement the above method is also disclosed.

Abstract: A device for connecting a front derailleur to the front tube of a bicycle. The device is fixed to the derailleur and the front tube at a predetermined position and includes an adjustable rest for contacting the front tube and positioning the derailleur.

Abstract: A bottom bracket assembly (1) of a bicycle is disclosed. The bottom bracket assembly includes a shaft (2) extending along a predetermined longitudinal direction and a pair of bearings (31, 41) adapted to rotatably support the shaft (2) with respect to a housing box (10) provided in a bicycle frame, the bearings (31, 41) being mounted on the shaft (2) at opposite end portions (3, 4) of the shaft (2). The opposite end portions (3, 4) of the shaft (2) have an outer diameter (D2) between 28 mm and 37 mm, bounds being included, and the distance (D1) between the median planes (Y1, Y2) of the bearings (31, 41) along the longitudinal direction is between 80 mm and 100 mm, bounds being included.

Abstract: The disclosed bicycle gearshift (20) includes a support member (22) configured for mounting on a bicycle frame, a driving member (24) for driving of a bicycle chain, and at least one articulation arm (28) to movably connect the driving member (24) to the support member (22). The articulation arm (28) is connected to at least one portion of the support member (22) and the driving member (24) so that it can rotate about a respective rotational axis (30a) through at least one respective connecting pin (40a) extending along the rotational axis (30a). At least one first rolling element (54) is operatively arranged in the radial direction between the connecting pin (40a), one of the articulation arms (28), the portion of the support member (22), and the driving member (24).

Abstract: A bicycle gearshift support (22) including an anchoring (32) and a coupling (34) portion that are structurally distinct from each other and joined by a connector is disclosed. The invention is particularly well suited for a bicycle front gearshift (20), and the structurally distinct elements can be made from different materials.

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 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 bottom bracket assembly has a shaft having a longitudinal axis X-X, a pair of bearings configured to support the shaft in rotation with respect to a housing box of the bottom bracket assembly provided in a bicycle frame, and a pair of adapter devices configured to be cantilevered with opposite free ends of the box to support the bearings outside of said box. At least one of the adapter devices has at least one first stop element and at least one second stop element arranged on opposite sides with respect to at least one bearing, wherein the first and second stop elements cooperate with the at least one bearing to keep the at least one bearing inside a space having a predetermined axial extension. The bearing's movement is thus limited in the axial direction, providing a fixed reference to determine the chain line of the bottom bracket 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 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: 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.