Bike Rack Cross-Bar Adapter - Universal Top Tube Frame Mount for Car Racks - Adj

THULE Frame Adapter 982XT Extending Cross Bar Only for Bicycle Bike Roof Racks

Allen 900B Tension Bar Bicycle Frame CrossBar Adaptor for Bike Racks

Hollywood Racks Bike Adapter

Hollywood Racks Bike Adapter Pro Mounting Bar BBR-K 20” - 26.5” Center To Center

Universal Bike Crossbar Adapter for Racks – Adjustable Frame Tube Bar for 14”...

Hollywood Racks Bike Adapter Pro (BA-PRO) — 20” - 26.5” Center To Center