Park Tool DH-1 Dummy Hub Swim Type_Swimskin Machined aluminum top cap is

Machined aluminum top cap is threaded for easy installation on any road bike

1 1/8 inches in diameter

External shift cable routing for low friction

considering frame optimization

Park Tool DH-1 Dummy Hub Swim Type_Swimskin Machined aluminum top cap isThe DH 1 Dummy Hub slides into the rear dropouts of a bicycle frame and replaces the rear wheel, keeping the chain in place while the wheel is removed for cleaning, service, or transportation. The unique design allows the bicycle to be pedaled and the derailleur to be shifted, making the DH 1 an essential tool for chain cleaning or diagnosis of drivetrain issues. Compatible with all multi speed and 1 8" chain Compatible with quick release and 12 mm