Park Tool DH-1 Hub Simulator

The Park Tool DH-1 hub simulator slides on the rear toes of a bicycle frame and replaces the rear wheel, keeping the chain in place while the wheel is removed for cleaning, maintenance or transportation. Its unique design allows you to pedal the bike and change the derailleur, making the DH-1 an essential tool for chain cleaning or transmission problem diagnosis.Features:Compatible with all 1/8 speeds and chainsCompatible with quick-closing frames and 12mm thru axle