Our moshay bicycle frame crossbar top tube adjustable adapter is designed to allow you to install bicycle frames with openings between 18 "- 28", such as women's walking frame, full suspension and other unconventional designs. The built-in internal spring generates the required tension to ensure that your bike is safe and reliable when traveling. The durable plastic coated hook ensures that the paint on the bicycle frame is protected from any abrasion and scratch. No matter what your bike destination is, the moshay bicycle frame crossbar top pipe adjustable adapter will ensure that your bike arrives safely and is ready to ride!