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The Surly DUH system single-speed rear axle helps transform your geared bike into a single-speeding machine. You will also need a Surly DUH single-speed chip and hardware (FS0268 - sold separately) to complete the setup.Note: The Surly DUH single-speed thru-axle only works with the DUH single-speed chip and hardware.
| Rear Axle Type | 12mm Thru x 148mm |