The Delta Adjustable Crossbar Top Tube Adaptor quickly and securely adjusts to fit most bikes that have a slopping or non-traditional shaped top tube to make transporting your bike on a hanging style hitch or truck rack a lot easier. The Delta Top Tube Adaptor is compatible with bikes that have a stem to seatpost distance range from 23-32.25" and a max weight of 50lbs. A thick rubber coating on the Delta Top Tube Adaptor helps protect the finish on your bike at the contact points. Makes carrying hard to fit bikes easier Max bike weight is 50lbs Quick release clamp for easy adjustment Fits top tubes from 23-32.25"