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Heads up, singlespeeders! If you’re trying to convert any recent model bike into a singlespeed, you’ve probably realized by now that since the dropouts are vertical, there isn’t any way to properly tension the chain. Surly comes to the rescue with the Singleator. This handy device mounts to the derailleur hanger and provides proper chain tension in a simple, lightweight package.

• Tensioner allows use of 1-speed drivetrain on vertical drop frame
• Mounts to derailleur hanger, self aligning floating pulley
• Adjustable chain line
• anti-chain drop hoop
• This part requires an 18mm Cone wrench to make it work. See the the Surly wrench below. It’s the perfect fit. If you are self-installing, make sure to have one on hand. Make sure to read the instructions.
• Weight: 157 g