Patent ID: 8375827

Claim:
A bicycle crank assembly comprising: a crank arm including a front side surface and a back side surface, the crank arm having a crank axle mounting portion with a crank axle receiving opening defined by an axle coupling structure having a first axial end edge adjacent the front side surface of the crank arm and a second axial end edge adjacent the back side surface of the crank arm, the axle coupling structure at least including a plurality of full length splines extending completely in an axial direction of the crank axle receiving opening from the first axial end edge to the second axial end edge, a plurality of adjacent first short splines extending in the axial direction each having a first truncated end positioned adjacent the first axial end edge such that the first short splines extend to the second axial end edge and do not extend completely from the second axial end edge to the first axial end edge, and a plurality of adjacent second short splines extending in the axial direction each having a second truncated end positioned adjacent the second axial end edge such that the second short splines do not extend completely from the first axial end edge to the second axial end edge.