The DT Swiss Star Ratchet Microspline 12 Speed Hub is a replacement part for needed to run the new Shimano 12speed mountain cassettes It features a star ratchet system Key Features It is designed for Shimano Micro Spline 12speed 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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