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Bike racks designed around a straight top tube don't always work with a women's step-through or angled-frame bike, which is where this CURT adapter bar comes in. It bridges the gap between the frame and the rack's cradle so the bike sits and clamps the same way a standard frame would.
If your bike doesn't have a top tube to clamp onto, this bar is a simple fix that lets you keep using the rack you already have.