Bike frame adapter

B-3668 Available

This adapter can be used to attach a bike with a curvy top tube to a rack that expects a flat top tube. The manufacturer says:

Hook any funky-top-tubed bike to a mast-style hitch rack with the TubeTop. Installs quickly and securely to seat post and stem to create a faux-top-tube so your bike mounts solidly to the rack. 

If you have a step-thru frame you might need this, but bikes with slightly curved top tubes might be OK without it.
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