Malone Top Tube Bike Frame Adapter - The Top Tube Adapter provides a removable frame piece for use when the bike is required to hang from a bike carrier's horizontal arms. Works for bikes with step-through or other unconventional frame designs. Easy one button operation opens locking gates that snap shut around the seat post and stem. Includes Lifetime Limited Warranty. Features Coated gates protect the bike's finish from abrasions One button operation for a quick and simple install Oversize telescoping shaft fits most bikes