Saris Bike Beam Top Tube Adapter, Black The Saris Bike Beam Top Tube Adapter creates a top tube for non traditional bike frames from the stem to the seatpost Ideal for mounting your bike to a car rack or home storage unit Easy to use, the secure snapping feature insures that your bike beam is properly installed Solves the issue of how to quickly, and easily, move your bike from place to place Lifetime warranty