Incredibly easy to put in place once you remove the rear wheel, the Park Tool DH-1 Dummy Hub slides into rear dropouts and replaces the rear wheel for chain cleaning and transport. Its' unique design allows the bike to be shifted and works on frames with both open-type dropouts and 12mm thru axle dropouts. It's definitely a must-have for chain or derailleur cleaning and is extremely helpful for diagnosing issues with the chain or the derailleurs.
• Works with open dropout and thru-axle frames up to 12mm
• Works with all derailleurs and 3.17mm (1/8") chain
• Protects your frame from your chain
• Unique design allows the bike to be shifted with the Dummy Hub installed
• Allows you to extend and retract the derailleur without removing the chain
• 12mm shaft ensures compatibility with any thru-axle