This item works as a "substitute top tube" to help carry odd-shaped bikes (mixte frames, tandems, kid's bikes) on rear hitch racks that require a traditional level top tube. Fits up to 1 3/8" tube.
Attaches to the seat post to stem of the bike creating the standard top tube of a men's style frame. Ideal for Y-bikes, women's and kid's bikes small frames and bikes with over-sized tubes.