Patent ID: 8770061

Claim:
Crank assembly for a bicycle bottom bracket assembly, comprising: a right crank arm and a left crank arm; a shaft having a body extending along a longitudinal axis by a predetermined distance to join the right and left crank arms in an assembly; at least one of said crank arms being associated with at least one free end of said shaft; at least one coupling between said at least one free end of said shaft and said at least one crank arm; wherein said at least one coupling comprises a first front toothing extending circumferentially on a front end surface of said at least one free end of said shaft, and a second front toothing extending circumferentially on a front end surface of an annular portion of said at least one crank arm associated with said at least one free end of said shaft, the first and second front toothings each having an axial end surface that is sloped along a radius of said annular portion of said crank arm, a plurality of teeth that each includes a pair of side surfaces, and a plurality of throats, each throat being defined between two adjacent teeth, wherein contact between said first and second front toothings occurs solely at a curved base surface of said throats defined between said first and second front toothings.