1) Possibly annoying as it blocks your rear view or boot entry depending on car.
2) Road grime and cruddy weather.
3) Somebody is eventually going to steal your bike.
Originally Posted by
Mojo31
I don't leave a bike on the rack if I won't be able to see it. That's even true if it's locked to the rack.
^ This. The longest I've ever left my bike on the rack unattended is ducking in to pay for fuel. Even then I was nervous! 😅