Like I said, if you used the sunroof and rear window, no risk. I need to test putting my rear wheel holder closer to the back edge or even on the wing, it does deflect a good bit when in the middle of the roof panel with my mountain bike. Like you, my road bike is sub UCI weight limit and barely has an impact when mounted.My road bike is like 16 lbs. Prob closer to 15 with the front wheel off. I've seen the sucker mount in action on other cars. The amount of deflection was pretty gnarly from what I witnessed. Would be the largest deterrent.