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Optimized Power Transfer: Designed for riders who demand maximum efficiency—every watt you generate is transmitted with precision Premium Construction: CNC-machined AL 7075-T6 aluminum combined with a structural 3K carbon layer for extreme stiffness and lightweight performance Specifically desgined to be compatible with Shimano Dura-Ace 9200 chainsets Versatile Setup: Compatible with both Miche R12 and original Shimano inner chainrings Dedicated Design: Compatible with cranksets with power meters