| 摘要 |
A variable speed-type bicycle chain ring assembly includes a hub member having a plurality of angularly spaced radial arms which are stepped at a front side of the hub member so as to form at least two mounting sections that are spaced at different radial distances from a center point of the hub member. The mounting sections of the radial arms are circumferentially aligned. The thickness of the mounting sections increases from an outermost end to an innermost end of the radial arms. The bicycle chain ring assembly further includes at least two concentric sprocket ring members of different diameters. The sprocket ring members are mounted on the hub member at a respective one of the mounting sections.
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