Heininger 6009 Advantage SportsRack Top Tube Alternative for Women's and Kid's Bike Adapter for kids and womens bikes Top Tube Adapter adjusts from 15.5 to 30 inches in length (measure from handle bar to seat bar to check compatibility) Coated loops protect your bike from wear and scratches One Top Tube Adapter securely holds one bike on a hanging bike rack. Buy additional adapter for additional bikes Stable and secure for worry-free transportation