This chain tensioner fits to your gear hanger in place of your rear derailleur and adjusts the tension on your chain when riding on a single rear sprocket.
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• Takes up chain slack when running Single speed on vertical dropout frames.
• Converts any multi speed bike to a single speed
• Floating pulley and spring adjusts for perfect chain tension
• Mounts on derailleur hanger
• Spring loaded chain tensioner
• Fits up to 22 teeth sprockets
• Adjustable chainline