| 摘要 |
A bicycle crank arm assembly (14; 214; 314; 414) for a bicycle is disclosed herein which is designed for mounting a sprocket (20, 220) thereto. The crank arm has a centrally located hub portion (30; 230; 330; 430), a crank portion (32; 232; 332; 432) extending radially outwardly from the hub portion and at least three fastening fingers (34; 234; 334; 434) extending radially outwardly from the hub portion. The fastening fingers are designed to have substantially the same stiffness at their free ends. This can be accomplished in a variety of ways such as change the cross-section of the fastening fingers adjacent the crank portion or changing the shape of the sprocket mounting portions (68; 468) of the fastening fingers. Also, in certain embodiments the fastening fingers adjacent the crank portion are constructed such that their rear surfaces lie in the same plane as the rear surface of the crank portion adjacent thereto, or in a lower plane. <IMAGE> |
