Yakima 8002531 Tube Top Bike Frame Adapter | Quadratec
Thule Frame Adapter for Hard to Carry Bikes on Hanging Bike Racks - YouTube
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Thule 982XT Top Tube Frame Adapter - REV Endurance Sports
SportRack SR0500 Alternative Hitch-Mounted Bike Frame Adapter, Granite Gray - Walmart.com
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Sportrack Adjustable Bike Frame Adapter – Mack Cycle & Fitness