The Bike Adapter Pro is an artificial top tube that allows you to transport a variety of different bicycles with sloping top tubes, including but not limited to ladies, children’s, cargo, and full suspension bicycles on your bicycle rack. The telescoping bar will fit various size bicycles, and will not scratch your bike's finish. The adapter is heavy duty, non-twisting tubing, and has a secondary interlocking gate. Specifications Fits a variety of bike sizes with telescoping tube that adjusts from 21" to 28" long Hook width: The large side 2.25" and the small side, 1.25" Attaches to your bike's seatpost and handlebar stem post Easy push to operate pin and interlocking gate keeps each clamp closed Protects your bike's finish with non-marking plastic clamps Constructed of rust-resistant, sturdy steel with black powder coat finish Maximum weight capacity is 35 lbs. on hanging style racks When used on the Sport Rider for Electric Bike Rack, the weight limit is 80 lbs.