When it comes to loading bikes on your car's bike rack, not all bikes are created equal. Many lack the top cross bar (e.g. women's or children's bikes) that you normally set on the rack arms. Without that cross bar, how are you to load your bike on the rack?
Heininger has the answer with the Top Tube Alternative attachment. Adjustable to fit most any bike size, it attaches under the seat and to the handlebar stem to create a sturdy top cross bar replacement.