Includes a Surly DUH system single-speed chip and hardware to transform a geared bike into a single-speeding machine. You will also need a Surly DUH single-speed rear thru-axle (FS0270 – sold separately) to complete the setup.Note: The Surly DUH single-speed chip and hardware only work with the Surly DUH single-speed thru-axle.
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