Patent ID: 8573093

Claim:
Right crank arm assembly for a bicycle, comprising a right crank arm having at least two free end portions spaced away from a rotation axis, an inner side intended, in use, to face towards a frame of the bicycle and an outer side opposite said inner side, a first annular element having at least one first coupling portion directly coupled with a respective one of said crank arm free end portions, at least one second annular element coupled with said crank arm and of a smaller size than said first annular element, wherein said first annular element comprises a toothing that extends radially towards the outside along a primitive circumference having a predetermined diameter, wherein said at least one first coupling portion is contained in a first area extending radially towards the outside starting from an ideal circumference having a diameter that is less than said predetermined diameter, wherein said at least one first coupling portion is defined by at least one first coupling element which comprises a hole for coupling with said respective one of said crank arm free end portions, said at least one first coupling element being entirely formed on a cantilevered portion of said first annular element and extending-radially inward up to said ideal circumference, wherein said first annular element comprises at least one first contact element, that acts on one of said sides of said crank arm, which lacks any coupling holes and which is structurally distinct from said at least one first coupling element, said at least one first contact element extending radially cantilevered from an inner surface of said first annular element and being entirely contained in said first area, and wherein said first annular element comprises at least one second contact element that acts on the other of said sides of said crank arm, said at least one second contact element extending cantilevered from said inner surface of said first annular element on the opposite side to said at least one first contact element with respect to said at least one first coupling element.