Dummy Hub
The Toopre 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, servicing, or transporting without a rear wheel. This dummy hub allows the bicycle to be pedaled and the derailleur to be shifted.
How to use a dummy hub
Dummy hub, chain holder သုံးပုံသုံးနည်းကို Park Tool ရဲ့ အလားတူပစ္စည်းဖြစ်တဲ့ DH-1 YouTube clip ကနေ လေ့လာပေးပါဗျာ။