SPECS: Adjusts 18" frames to 30.5" frames FEATURES: Modifies women's bike frames to allow you to be carried on hanging-style hitch and strap mount bike racks Telescopic adjustment makes it simple and easy to fit your bike frame New push button clamps make a convenient wat for quick installation and removal Molded rubber pads protect your bike's frame finish Keeps bike securely centered with mounted hanging style rear mounts Durable rubber collars fasten safely and easily to bike stem and seat post