The DT Swiss Star Ratchet Microspline 12 Speed Hub is a replacement part for needed to run the new Shimano 12-speed mountain cassettes. It features a star ratchet system. Key Features: - It is designed for Shimano Micro Spline 12-speed cassettes- It is compatible with DT Swiss 180, 240, 350, and 440 hubs- DT Swiss factory also works with other brands (Ratchet System) ratchet structure hubs or wheels, such as specialized and Bontrager

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