The Allen Sports adaptor bar adds a top tube to your bicycle frame so that it can be installed properly on a rear mounted bicycle carrier. 

• Enables bicycle transport by adding top tube to suspension, step through, BMX, and women's style bicycles
• Internal spring that maintains constant tension to keep your bike secure.
• Fits bikes that have a distance of 18 inches to 27 inches between the seat post and the stem
• Easy installation is easy with no assembly required.
• Plastic-coated hooks are there to protect the finish of your bike.
• 35 LB weight capacity.